8 Best Apps for Booking Flights on Mobile in 2026

Quick comparison

The best app for booking flights on mobile

#1

Google Flights

Best for: Travelers who want the fastest free flight search with flexible dates and price tracking in one place

Visit google.com

Starting priceFree

Free planYes — free, no paid tier

Google Flights is the free search most travelers should start with: fast, plain fares, and it never tries to sell you anything. The date grid lays departure and return dates in a matrix with a price in every cell, and the price graph shows how the fare moves across the coming months, so shifting a trip by a day is a visible choice, not a guess.

Track prices watches exact dates or any dates on a route and emails you when the fare changes, and the Explore map finds cheap destinations from your home airport within a budget. The catch is that Google Flights never takes your money, so changes and refunds go through the airline or agency you clicked to. Select US itineraries carry a price guarantee that refunds the difference if the fare drops after booking.

What we like

• Completely free with no ads in the results, no markup on fares and no premium tier
• Date grid and price graph show the cheapest days at a glance, with a low, typical or high price verdict
• Track prices watches exact dates or any dates on a route and emails you when the fare moves
• Explore map finds the cheapest destinations from your home airport within a budget

Watch out for

• Price tracking needs a Google account, and alerts arrive by email rather than push
• Some airlines do not list fares on Google Flights, so a direct check is still worth doing
• It shows fares but never sells the ticket, so changes and refunds go through the seller

#2

Skyscanner

Best for: Flexible travelers who want to search everywhere, any month, before picking a destination

Visit skyscanner.net

Starting priceFree

Free planYes — free, no paid tier

Skyscanner is the flexible-travel pick: the app for when you know you want to go somewhere, but not where or exactly when. Type Everywhere as the destination and it ranks the cheapest countries and cities from your home airport; pick a whole month or the cheapest month and a color-coded calendar shows the lowest fares day by day.

Price alerts watch a route and email you when the fare changes, and Skyscanner charges no booking fees at all — you pay the airline or travel agency directly. The trade-off is that the prices shown are estimates, so the fare can rise when you reach the seller's checkout. Check the seller's name and reviews before you pay, especially on the smallest ones.

What we like

• Everywhere search ranks the cheapest destinations worldwide from your home airport
• Whole month and cheapest month views show the lowest fares across a month or a year
• Price alerts email you when the fare on a watched route changes
• No booking fees and no charges of any kind — you pay the airline or agency directly

Watch out for

• Prices are estimates that can change when you reach the seller's checkout
• No buy-now-or-wait prediction, so timing the purchase is left to you and your alerts
• Small or unfamiliar booking sites appear in results, so the seller needs a check before paying

#3

Kayak

Best for: Travelers watching several routes at once who want a buy-or-wait call and one itinerary app

Visit kayak.com

Starting priceFree

Free planYes — free, no paid tier

Kayak is the all-rounder: a metasearch engine with a forecast, unlimited alerts and a full trip organizer in one free app. The Price Forecast box on most round-trip searches says buy now or wait, based on how the fare is expected to move over the next seven days, and price alerts are free with no stated limit on how many routes you watch.

Trips pulls flights, hotels and cars into one itinerary with live flight status and gate changes, and it works offline, which matters at the airport. The Fee Assistant folds baggage fees into the displayed price, so a cheap fare that charges for a bag compares honestly. The catch is the handoff: Kayak never sells the ticket, so the price can change on the seller's site.

What we like

• Price Forecast gives a buy-now-or-wait call on most round-trip searches, based on the next seven days
• Price alerts are free with no stated limit on how many routes you can watch at once
• Trips pulls every booking into one itinerary with flight status, gate changes and offline access
• Fee Assistant folds baggage fees into the displayed price so cheap fares compare honestly

Watch out for

• Kayak hands you to another site to book, and the price you saw does not always survive the click-through
• The Price Forecast covers roughly the next seven days, so it cannot time a trip months out
• Hacker Fares combine separate one-way tickets, so each leg has its own change and refund rules

#4

Hopper

Best for: Travelers with flexible dates who want a forecast that says buy now or wait

Visit hopper.com

Starting priceFree

Free planYes — free app; Price Freeze and flexibility plans are paid per booking

Hopper is the only app here built around telling you when to buy, not just what a flight costs. Its predictions say buy now or wait for a route, and Hopper claims 95% accuracy on those forecasts. Watch a trip and the app monitors the fare around the clock, and the color-coded deals calendar shows the cheapest dates to travel at a glance.

Price Freeze locks a fare for a set period for a fee, so a rise during that window does not cost you more. The extras are the catch: the freeze fee is not refundable if you cancel, and flexibility plans are priced per booking. In 2026 Hopper settled an FTC complaint about pre-selected fees without admitting wrongdoing, so read every add-on line before you pay.

What we like

• Price predictions say buy now or wait, with Hopper claiming 95% accuracy on its forecasts
• Watch a trip and Hopper monitors the fare around the clock, notifying you when a deal appears
• Price Freeze locks a fare for a set period so a rise does not cost you more
• Color-coded deals calendar shows the cheapest dates to travel at a glance

Watch out for

• Price Freeze and flexibility plans are paid per booking and the freeze fee is not refundable if you cancel
• Hopper sells the ticket itself, so changes and refunds usually go through Hopper, not the airline
• In 2026 Hopper settled an FTC complaint about pre-selected fees without admitting wrongdoing, so check every add-on at checkout

#5

Expedia

Best for: Travelers who book flights, hotels and cars together and want rewards on the whole trip

Visit expedia.com

Starting priceFree

Free planYes — free, no paid tier

Expedia is the one-stop shop in this list: flights, hotels, cars and packages in a single app, with a free rewards program on top. One Key costs nothing to join and gives Member Prices of 10% or more on eligible hotels, cars and activities, plus OneKeyCash toward future travel. Price Tracking is free at every tier and alerts you when a watched fare changes.

Bundling a flight with a hotel or car can save up to 30%, per Expedia, and Gold and Platinum members get Price Drop Protection free on eligible flights booked in the app. The catch is on flights alone: members earn no OneKeyCash on standalone flights, so the rewards sit on the hotel and car side of the trip.

What we like

• One Key is free to join and gives Member Prices of 10% or more on eligible hotels, cars and activities
• Price Tracking is free at every membership tier and alerts you when a watched fare changes
• Bundling a flight with a hotel or car can save up to 30%, per Expedia
• Flight Deals on the map shows cheap flights from your home airport without a destination in mind

Watch out for

• Members earn no OneKeyCash on standalone flights under the current program
• Price Drop Protection is free only for Gold and Platinum members, not for everyone
• OneKeyCash can only be spent on Expedia, Hotels.com and Vrbo, never as cash

#6

Kiwi.com

Best for: Adventurous travelers building multi-city trips from airlines that never sell connections together

Visit kiwi.com

Starting priceFree

Free planYes — free, no paid tier

Kiwi.com is the route-builder: it stitches together flights from airlines that do not partner with each other, a trick called virtual interlining, and sells the combination as one trip. Nomad takes the cities you want to visit and the nights you want in each, then finds the cheapest order to visit them in — a job no ordinary multi-city search does.

Price alerts notify you when a watched route drops, and the app searches flights, trains and buses together. The risk is real, though: a self-transfer means separate tickets, so you collect your bags and check in again at each stop, and the Kiwi.com Guarantee that covers a missed connection is a paid add-on. Leave long gaps between legs.

What we like

• Virtual interlining combines airlines that do not partner, opening routes no single airline sells
• Nomad finds the cheapest order to visit several cities, instead of pricing the order you typed
• Price alerts notify you by email or push when a watched route drops
• Searches flights, trains and buses together, with date ranges and whole-month views

Watch out for

• A service fee is added at booking and is not shown until checkout
• Virtual interlining means separate tickets: you re-check in and collect bags at each self-transfer
• The Kiwi.com Guarantee that covers a missed self-transfer is a paid add-on, not included

#7

CheapOair

Best for: Travelers who want a real person on the phone when a booking goes wrong

Visit cheapoair.com

Starting priceFree

Free planYes — free, no paid tier

CheapOair is the human-help pick: fares from 500+ airlines in one search, plus a real person on the phone around the clock. Fare alerts and a Low Fare Calendar show prices across a two-month window for US domestic routes, and ClubMiles is free to join, earning up to 6X points on eligible bookings made through the app.

The Price Match Promise refunds the difference if the same itinerary is cheaper on Expedia, Orbitz, Priceline or Travelocity within 24 hours of booking. The catch is the fine print: a service fee may apply on some bookings and is disclosed only at checkout, and change and cancellation fees are a common complaint. Read the fare rules before you pay.

What we like

• Compares fares from 500+ airlines in one search, with flexible dates and fare alerts
• Travel Experts are available 24/7 by phone or in-app calling, including free in-app calls abroad
• ClubMiles is free to join and earns up to 6X points on eligible bookings through the app
• Price Match Promise refunds the difference if the same itinerary is cheaper elsewhere within 24 hours

Watch out for

• CheapOair may apply a service fee on some bookings, disclosed only at checkout
• Change and cancellation fees are a common complaint, so read the fare rules before paying
• Price Drop Payback and the Price Match Promise have conditions and time limits

#8

Momondo

Best for: Bargain hunters who want to see what smaller booking sites charge for the same flight

Visit momondo.com

Starting priceFree

Free planYes — free, no paid tier

Momondo casts the widest net in this list: a metasearch engine that compares fares from hundreds of sites, including small online travel agencies the bigger apps never show. Flight Insights analyze the route and tell you the cheapest month, day and time to fly and the cheapest time to buy, and the Anywhere search lists the cheapest destinations for your dates.

Mix & Match can pair an outbound ticket from one seller with a return from another for a lower total, and price alerts are free. The catch is the handoff: Momondo never sells the ticket, so the fare can rise at the seller's checkout and any change or refund goes through that seller. Check the seller before you pay.

What we like

• Flight Insights show the cheapest month, day and time to fly and the cheapest time to buy
• Anywhere search lists the cheapest destinations from your home airport for your dates
• Mix & Match combines an outbound ticket from one seller with a return from another
• Price alerts are free, and the calendar view shows fare changes around your dates

Watch out for

• Momondo never sells the ticket, so changes and refunds go through the seller you clicked to
• Prices can rise at the seller's checkout, and some of the smaller sellers are unfamiliar
• Mix & Match tickets can mean two separate bookings with two sets of change and refund rules

The best app for booking flights on mobile is the one that shows you the real fare, tells you whether to buy now or wait, and hands you to a seller you can trust. We ranked the eight apps below by fit for the most common traveler — someone booking a flight on a phone, with dates that can move a little — and every app here is free, checked on November 4, 2026.

How to choose the best app for booking flights on mobile

• Start with who sells the ticket. Metasearch apps (Google Flights, Skyscanner, Kayak, Momondo) show fares and hand you to the seller. Online travel agencies (Expedia, CheapOair, Kiwi.com, Hopper) sell you the ticket themselves. The seller, not the app, handles changes and refunds.
• Decide whether you need a prediction or an alert. Only Hopper and Kayak forecast whether the fare will rise or fall. The rest show today's price and watch it for you with alerts. If your dates are fixed, an alert is enough; if they can move, a forecast earns its keep.
• Check how flexible your search can be. If the destination is open, Skyscanner's Everywhere search and Google Flights' Explore map find it for you. If the dates are open, whole-month and cheapest-month views matter more than any single fare.
• Count the real total, not the headline fare. Baggage fees, seat selection and service fees change the answer. Kayak's Fee Assistant folds bag fees into the price; Kiwi.com and CheapOair add service fees at checkout.
• Think about what happens when plans change. A cheap fare with no changes allowed is expensive the day you need to move it. Hopper sells flexibility per booking, and Expedia's Price Drop Protection covers Gold and Platinum members on eligible flights.
• Keep the itinerary in one place. Kayak Trips and the Expedia app hold flights, hotels and cars together with live status and offline access, which matters at the airport more than it does at home.

Flight search is one system in your stack, not the whole trip. Once the flights are sorted, our guide to the best map app for road closures covers the drive to the airport, and if the trip is abroad, our guide to the best AI Spanish learning app helps with the language on arrival. Before you publish the trip photos, run your titles through the free SERP snippet preview tool — it shows exactly how the title and description will look in Google.

Whatever you shortlist, install two apps, not one. Run the same route and dates through Google Flights and one rival, set a price alert on both, and let the alerts argue with each other for a week. That week tells you more than any review can: which app finds the fare first, which alert fires first, and which seller the fare actually leads to.

Flight booking app pricing: what you will actually pay

The honest answer is $0 for the apps and the full fare for the flight. None of the eight apps charges a subscription, a download fee or a premium tier, so the price of using them is nothing. What you actually pay is the fare, plus whatever the seller adds: baggage, seat selection, a service fee, or an optional extra like a price freeze.

Take a real example from a 2026 booking: a round-trip Detroit to Las Vegas fare of $178 on Hopper, with a Price Freeze offered at $48 per person for 7 days. The freeze locks the $178 fare, covers a rise of up to $300 per traveler, and costs $48 whether or not you book — about 27% of the fare for a week of certainty. If the fare falls during that week, you pay the lower fare, but the $48 is gone either way. That is the real arithmetic of Hopper's extras: cheap insurance against a rise, expensive if the fare never moves.

Two other costs sit outside every number above. First, the service fee: Kiwi.com adds one at booking and does not show it until checkout, and CheapOair may apply one on some bookings, disclosed only at checkout. A fare that looks $20 cheaper than the airline's own price can cost more once the fee lands. Second, the flexibility plan: Hopper's refundable and flexible-date plans are priced per booking, so a traveler who changes plans often pays for flexibility on every trip, while a traveler with fixed dates pays nothing.

At the other end, Expedia's bundle is the one place the app itself saves money: booking a flight with a hotel or car can save up to 30%, per Expedia, and One Key members get Member Prices of 10% or more on eligible hotels, cars and activities. The saving sits on the hotel and car side, not the flight — members earn no OneKeyCash on standalone flights. For the trip budget as a whole, see our guide to expense software to keep the spending in one place.

Know the difference: metasearch vs online travel agency

The confusion in this category is between a search engine and a seller. A metasearch app — Google Flights, Skyscanner, Kayak, Momondo — collects fares from airlines and booking sites, shows them side by side, and sends you to the seller to complete the booking. You never pay the metasearch app, and it never holds your ticket. An online travel agency — Expedia, CheapOair, Kiwi.com, Hopper — sells you the ticket itself: you pay the agency, the agency issues the ticket, and the agency is the one you call when something goes wrong.

That distinction decides who helps you when a flight is cancelled. Book through a metasearch app and the airline or the agency you clicked to owns the booking; the app can show you the status, but it cannot rebook you. Book through an agency and the agency owns it, for better or worse: Expedia and CheapOair have 24/7 support lines, while Hopper's support is a frequent complaint in customer reviews. Neither model is wrong, but they are not the same purchase.

There is a second, quieter confusion: a fare shown is not a fare paid. Metasearch prices are estimates that can change when you reach the seller, because the seller reprices at checkout. Kiwi.com's virtual interlining adds a service fee that appears only at checkout. And a Hacker Fare or Mix & Match ticket can be two separate bookings with two sets of change and refund rules. The price on the screen is the start of the bill, not the end of it.

A third distinction worth knowing is prediction versus alert. Hopper and Kayak forecast where the fare is heading — Hopper claims 95% accuracy — while Google Flights, Skyscanner, Expedia, Kiwi.com, CheapOair and Momondo watch the fare and tell you when it moves. A forecast answers "should I buy now"; an alert answers "has it changed yet". Use the forecast when your dates can move, and the alert when they cannot.

Quick comparison: tool type by need

Mistakes to avoid

• Booking the cheapest fare without checking the seller. A fare from an unfamiliar agency can rise at checkout or come with refund rules you would never accept. Check who sells the ticket before you pay, not after.
• Paying for flexibility without reading the terms. Hopper's Price Freeze fee is not refundable if you cancel, and its flexibility plans are priced per booking. Know what the extra actually covers before you buy it.
• Treating the shown price as the final price. Baggage, seat selection and service fees change the total. Kiwi.com adds a service fee at checkout, and a fare that excludes a bag is not cheaper than one that includes it.
• Watching only one app. Fares differ between apps because they show different sellers. Set alerts on two apps for the same route and let them compete for a week.
• Booking separate tickets with a tight connection. Kiwi.com's self-transfers and Kayak's Hacker Fares are separate tickets: if the first flight is late, the second airline owes you nothing. Leave long gaps between legs, or book one ticket.

How we chose

We checked each app's own pages and app-store listings on November 4, 2026 and recorded the starting price exactly as shown: every app in this list is free to download and use, with no subscription or premium tier, so there is no monthly price to chart. Hopper's per-booking add-ons are priced per trip rather than per month, and the $48 Price Freeze example comes from a 2026 review of a real Detroit to Las Vegas booking, not from Hopper's own pages. We ranked the apps by fit for the most common traveler — someone booking a flight on a phone with dates that can move a little — not by brand size. This list carries no review ratings: the Trustpilot pages for these travel companies returned stale cached copies with conflicting scores across regional pages, so we show no rating rather than a stale or estimated one. No vendor paid for a place in this list, and none of the links here are affiliate links.

What to do next

Install two apps — Google Flights and one rival from this list — and run the same route and dates through both. Set a price alert on each, then wait a week and see which one finds the fare first and which seller the fare leads to. When the price looks right, check the airline's own price for the same flight before you pay, and read the fare rules for changes and baggage. If the flights are sorted but new customers are not finding your business, our monthly SEO service handles the visibility side. Once your tools are in place, find out what's holding your rankings back.

Sources we checked (8)

• Google Flights — google.com/travel/flights (checked November 4, 2026)
• Skyscanner — skyscanner.net (checked November 4, 2026)
• Kayak app — kayak.com/news/kayak-app (checked November 4, 2026)
• Hopper — media.hopper.com/articles/welcome-to-hopper (checked November 4, 2026)
• Expedia One Key — expedia.com/newsroom/best-travel-rewards-program (checked November 4, 2026)
• Kiwi.com travel hacks — kiwi.com/stories/kiwi-coms-travel-hacks-explained (checked November 4, 2026)
• CheapOair — cheapoair.com (checked November 4, 2026)
• Momondo — momondo.com (checked November 4, 2026)