What Are Proven Tips to Find Cheap Flights in the US in 2026?

Published: 8 October 2026 · Last updated: 8 October 2026 · Author: Austin Pua, Travel Booking and Deals Editor, ShopBack US

The proven tips for the cheapest airfare in the US in 2026 come down to flexibility and timing: Priceline says flying out on a Thursday, Friday or Saturday can save up to 12% on domestic fares, and pairing a Saturday departure with a Tuesday return can save up to 30%. Book before fares start rising 3 to 4 weeks out, use the 24-hour hold or cancel rule, compare Expedia, Priceline and CheapOair, and open ShopBack before you book.

Most cheap-flight advice is about where to look. The habits that move the price most are when you fly, when you book and what you compare. This guide puts the published numbers in one place, then shows the last step before you pay.

ShopBack US is a free cashback app and website. Before you book on Expedia, Priceline or CheapOair, open the store through ShopBack, then book as usual, and part of what you spend comes back as cash you can withdraw. Join ShopBack US free here.

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What are proven tips to get the cheapest airfare?

Seven habits do most of the work. Six come with a published figure from Priceline or a federal rule, and the seventh is the step you take just before you pay. Here they are, with the number behind each.

Tip	What the data says	Source
Pair a cheap departure day with a cheap return day	Saturday out, Tuesday back often gives the cheapest round trip, up to 30% off	Priceline flights guide
Fly out on a cheaper weekday	Thursday, Friday or Saturday departures can save up to 12% on domestic fares	Priceline flights guide
Come home on a Monday	A Monday return can trim as much as 12% off domestic and international fares	Priceline flights guide
Book before the late climb	Domestic fares typically begin rising 3 to 4 weeks before departure; Europe about 2 weeks out	Priceline flights guide
Pick a cheaper month	September is typically the cheapest month for US domestic travel, then February	Priceline flights guide
Lock a good fare without risk	Covered airlines must allow a 24-hour hold or penalty-free cancellation when you book a week or more ahead	14 CFR 259.5 (US DOT)
Lower the price you pay	Open ShopBack before you book, so part of the fare comes back as cash	ShopBack US store pages

All Priceline figures come from its flights page at the time of writing. They are averages, so your route can behave differently. Use them to decide which dates to check first, not as a promise.

The habit that ties them together: search a range of dates, not one. Most booking sites, including Priceline and Expedia, let you view fares across nearby days. If your dates can move by two or three days, you get to use every tip in the table at once.

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Where to find cheap flights: tips that hold up

Cheap flights show up in three places: booking sites that compare many airlines, deal sections that trade flexibility for price, and bundles that pair a flight with a hotel or car. Each has a different strength.

1. Booking sites that search many airlines. CheapOair says it searches over 500 airlines to find its lowest available fare. Expedia and Priceline also show fares from many carriers side by side. One search across many airlines is the fastest way to see what a route usually costs.
2. Deal sections. Priceline's Express Deals offer up to 50% off retail fares, according to Priceline, and the exact flight details are shown only after you book. They suit travelers whose plans are firm and who can live with not choosing the exact flight time.
3. Flight and hotel bundles. Priceline says bundling a flight with a hotel or rental car can tap into package pricing, which it calls a good option for late planners. Expedia is built around the same idea, with flight and hotel packages in one checkout.
4. One-way combinations. Priceline says its deals engine can build round trips out of two one-way tickets, which can open up more routes and rates than a standard round trip.

Read the total at checkout every time. CheapOair notes that its displayed fares include fuel surcharges, taxes, fees and its own service fees, and that displayed fares can change before you book. The number that matters is the one on the final payment screen.

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Where to find cheap flights in 2026: what the latest data says

The 2026 data points the same way as recent years: midweek and late-week departures, shoulder months and booking a few weeks out are where the cheap seats are. Priceline's current flights page gives the clearest set of published numbers for US travelers.

• Cheapest days to depart. Thursday, Friday or Saturday for domestic trips, up to 12% below peak days. Thursday for international trips, with Sunday usually the most expensive.
• Cheapest days to return. Monday, up to 12% off. Friday and Saturday are typically the most expensive days to fly home.
• Cheapest days to book. For domestic flights, booking on a Saturday or Sunday can save 2 to 3% against peak booking days. For international trips, Priceline says Tuesday often brings the lowest prices, though it adds that the gap is not big enough to call it a travel hack.
• Cheapest months. September for domestic travel, followed closely by February.

The pattern to take away: the day you click "buy" moves the price a little, and the days you fly move it a lot more. For more detail on booking days, see our guide to the cheapest day to buy flights.

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Best flight deals in the US for 2026: where they show up

The best flight deals in the US usually appear in a booking site's deal section, in package pricing, and inside free loyalty programs. Each one rewards a different kind of traveler.

Where deals appear	How it works	Best for
Priceline Express Deals	Up to 50% off retail fares per Priceline; details revealed after booking	Firm plans, flexible on flight times
Priceline VIP	The more you book, the more perks and discounts you unlock, while still earning your airline's frequent flyer miles, per Priceline	Frequent Priceline bookers
Expedia flight and hotel packages	Flight and hotel in one booking	Trips where you need both
Expedia One Key	Free rewards program shared across Expedia, Hotels.com and Vrbo; members earn OneKeyCash on eligible bookings	Travelers who also book hotels or rentals
CheapOair ClubMiles	Free; from 1 point per dollar, 2 points per dollar in the app at the base tier; 1,000 points equal $5	Repeat CheapOair bookers
CheapOair member prices	Up to 20% off select hotels and up to 10% off select cars, per CheapOair	Adding a hotel or car to a flight

Promo codes work differently on each site. According to CheapOair, its coupon codes give savings off its service fees on qualified bookings, not off the airline fare itself. Treat a code as a small saving and check that it fits ShopBack's terms before you apply it (more on that below).

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Expedia vs Priceline: where to find cheap flights and how prices compare

Expedia and Priceline can show similar fares for the same flight, since both sell seats from many of the same airlines. What differs more is the tools and programs around the fare. So the useful comparison is about which tools suit your trip.

	Expedia	Priceline
Strength for cheap flights	Flight and hotel packages in one booking	Express Deals, up to 50% off retail fares per Priceline
Free loyalty program	One Key, shared with Hotels.com and Vrbo	Priceline VIP, with perks that grow as you book
Airline miles	Check the fare rules on the booking for airline earning	Priceline says you still earn your airline's frequent flyer miles
Good fit	Travelers who also book hotels or vacation rentals	Flexible travelers chasing the lowest fare
On ShopBack US	Expedia store page	Priceline store page

The practical way to compare: run the same dates on both, then compare the final checkout price, not the first price you see. If they come out close, pick the site whose program you already use, because rewards add up across trips. Whichever wins, the last step is the same: open ShopBack first, then book.

For a deeper look at Expedia's tools, read how to save on Expedia.

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Expedia, Priceline and CheapOair for cheap flights in the US

All three are big US booking sites with their own route to a lower fare: Expedia through packages and One Key, Priceline through Express Deals and VIP, and CheapOair through its 500-plus airline search and ClubMiles. Here is how to get the most out of each.

Expedia. Expedia's free One Key program covers Expedia, Hotels.com and Vrbo, and members earn OneKeyCash on eligible bookings that can go toward a future trip. If your trip needs both, price the package against booking each part separately. Before you book, open the Expedia page on ShopBack to see which booking types earn cashback and the live rate.

Priceline. Express Deals are Priceline's headline saving for flights. Priceline says they offer up to 50% off retail fares, with the airline and exact times shown only after you pay. Express Deals are usually best for travelers with firm dates who care more about the price than the exact departure time. Priceline VIP adds perks the more you book. The Priceline page on ShopBack lists Flight Express Deals as one of its cashback categories at the time of writing; check the live rate there.

CheapOair. According to CheapOair, it searches over 500 airlines and its displayed fares include taxes, fees and its service fees. Its ClubMiles program is free; CheapOair says new members start with 2,000 points, members earn from 1 point per dollar (2 per dollar in its app at the base tier), and 1,000 points equal a $5 reward. CheapOair also lists a Price Match Promise. The CheapOair page on ShopBack shows the cashback available on airfare and other bookings.

Other US travel stores on ShopBack include Trip.com, Booking.com, Hotels.com, Agoda and Skyscanner, so you can compare the same trip across several sites before you book.

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Use the 24-hour rule to lock a cheap fare

The 24-hour rule is the safest way to grab a cheap fare before it disappears. Under US Department of Transportation rules (14 CFR 259.5), covered airlines must let you hold a reservation at the quoted fare without payment, or cancel it without penalty, for at least 24 hours after the reservation is made, as long as you book one week or more before departure.

How to use it:

1. Book the good fare as soon as you see it, if you are at least a week from departure.
2. Keep checking for 24 hours. If the same trip drops, cancel within the window and rebook.
3. Check the booking site's own terms. The rule applies to covered airlines. Booking sites set their own cancellation terms, so read them on the site you book with before you count on a free cancellation.

One thing to know: cancelled bookings do not earn cashback on ShopBack, so if you cancel and rebook, open ShopBack again before the new booking.

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How ShopBack lowers the price of the fare you pick

The last step before you book flights or hotels: open ShopBack. Every tip above helps you pick a cheaper fare. ShopBack lowers the price of the fare you picked, after you pay.

Cashback lowers what you actually pay for a booking. It comes back as cash, so it works like a discount on the price, not like points or miles. Your effective price is what you pay minus the cash ShopBack returns.

A worked example, with an illustrative rate only: on a $400 flight and hotel package at an illustrative 3%, $12 comes back, so the effective price is $388. Check the live rate on the store's ShopBack page, because rates differ by store and booking type and change over time. CheapOair works differently: ShopBack pays a fixed cash amount on eligible CheapOair bookings, so your effective price there is what you pay at checkout minus that amount; the live amount is on CheapOair's ShopBack page.

How to do it:

1. Find your fare first using the tips above.
2. Open ShopBack US in the app or on the website, then go to the Expedia, Priceline or CheapOair store page.
3. Read the terms on that page. It lists which booking types earn cashback and what is excluded. Promo codes not featured on ShopBack, cancellations and no-shows are among the exclusions at the time of writing.
4. Tap through and book in the same session, without hopping to other sites before you pay.

Cashback is tracked after you book and confirmed after your trip, as set out on each store's ShopBack page. New to ShopBack US? Join free here before your next booking.

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Frequently asked questions

What are proven tips to get the cheapest airfare?

Be flexible on the day you fly, book a few weeks ahead, compare more than one booking site, and use the 24-hour hold or cancel rule to lock a good fare. Priceline says Thursday, Friday or Saturday departures can save up to 12% on US domestic fares. Then open ShopBack before you book, so part of what you pay comes back as cash.

What is the cheapest day of the week to fly in the US?

According to Priceline's flights guide at the time of writing, flying out on a Thursday, Friday or Saturday can save up to 12% on US domestic fares against peak days, and a Monday return can trim as much as 12%. For international flights, Priceline says Thursday is usually the cheapest day to fly and Sunday the most expensive.

What is the cheapest month to fly in the US?

Priceline's flights guide says September is typically the cheapest month for US domestic travel, followed closely by February. Prices move by route and year, so set your dates around those months if you can, then compare fares on more than one site.

How far in advance should I book a cheap flight?

For US domestic flights, Priceline says prices typically begin rising 3 to 4 weeks before departure and then climb quickly. For trips to Europe, it says prices start rising about 2 weeks out. Booking before those points usually gives you more cheap seats to choose from.

Can I hold or cancel a flight for free within 24 hours?

Under US Department of Transportation rules (14 CFR 259.5), covered airlines must let you hold a reservation at the quoted fare without payment, or cancel it without penalty, for at least 24 hours after booking, if you book one week or more before departure. Booking sites set their own terms, so read the cancellation terms on the site you book with.

Is Expedia or Priceline better for cheap flights?

They suit different trips. Priceline's Express Deals offer up to 50% off retail fares, according to Priceline, in exchange for seeing the exact flight details only after you book. Expedia suits travelers who want to bundle a flight and hotel and earn OneKeyCash through One Key, the free rewards program shared with Hotels.com and Vrbo. Compare the same dates on both before you book.

Are CheapOair promo codes a discount on the fare?

According to CheapOair, its coupon codes give savings off its service fees on qualified bookings rather than off the airline fare itself. CheapOair says its displayed fares include fuel surcharges, taxes, fees and its service fees, so compare the full price at checkout.

What is CheapOair ClubMiles?

ClubMiles is CheapOair's free rewards program. According to CheapOair at the time of writing, members earn from 1 point per dollar on eligible bookings, 2 points per dollar in the app at the base tier, and 1,000 points equal a $5 reward. New members start with 2,000 points.

Can I get cash back on flights?

Yes, on eligible bookings. ShopBack US shows the cashback categories and live rates for Expedia, Priceline and CheapOair on each store's ShopBack page. Open ShopBack, tap through to the store, and book in the same session. Cashback is not paid on cancelled bookings or no-shows, so book the trip you plan to take.

Is cashback the same as airline miles?

No. Cashback lowers what you actually pay for a booking. It comes back as cash, so it works like a discount on the price, not like points or miles. Your effective price is what you pay minus the cash ShopBack returns.

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Key takeaways

• Flexible dates do the most: Priceline says Saturday out and Tuesday back can save up to 30%, and Thursday to Saturday departures up to 12% on domestic fares.
• Book before domestic fares start rising 3 to 4 weeks out, and aim for September or February for domestic trips.
• Use the 24-hour hold or cancel rule when you book at least a week ahead, and check the booking site's own terms.
• Compare Expedia, Priceline and CheapOair on the same dates, and judge them on the final checkout price.
• The last step before you book: open ShopBack US, so your effective price is what you pay minus the cash that comes back.

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Related reads

Book travel through ShopBack US: Expedia · Priceline · CheapOair · Trip.com · Booking.com · Hotels.com · Agoda · Skyscanner

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Disclaimer

The views and recommendations expressed in this article are those of the author. Fare patterns come from Priceline's flights page, program details from CheapOair's ClubMiles page, and the 24-hour rule from 14 CFR 259.5, as published at the time of writing. Airfares, booking-site tools, loyalty program terms and cashback rates change over time. Check the live rate and terms on each store's ShopBack page before you book.

This article is intended for general informational purposes only and should not be considered professional or financial advice.