The Cheapest Days to Fly, and Why
Which days of the week have the lowest fares, how much the difference is, and how to use it when your dates are flexible.
By WarBird Flight editors · Updated September 15, 2026 · 3 min read
Midweek wins, almost always
Across US domestic routes, Tuesday and Wednesday departures price lowest, Saturday is close behind, and Friday and Sunday are the most expensive. The gap between a Tuesday and a Sunday on the same route is commonly 15 to 30 percent, and larger around holidays. Our own day-by-day fare data, in the data study on the cheapest day of the week to fly, shows the same pattern route by route.
Why it happens
Airlines price by demand. Business travelers fly out Monday and back Thursday or Friday; leisure travelers leave Friday and return Sunday. Tuesday, Wednesday, and Saturday are the leftover days, and the cheapest fare buckets stay open longer on them.
Time of day matters too
The first departure of the morning and the last of the evening are usually cheaper than midday flights on the same route. Red-eyes on transcontinental routes are the cheapest of all.
It is the day you fly, not the day you book
A persistent myth says there is a magic day of the week to buy tickets — that booking on a Tuesday gets you a lower fare. There isn't one that reliably holds; fares change throughout the week and even through the day as inventory sells. What genuinely moves the price is the day you travel, not the day you sit down to buy. So spend your effort choosing a cheap departure and return day, and book whenever you have found a fare you are happy with rather than waiting for a supposed sale day that may never come. The 24-hour rule lets you lock a good fare and still back out the next day if you find better.
Each direction is priced on its own
Because airlines price each leg by that day's demand, the cheapest round trip often mixes a strong day out with a strong day back — a Tuesday departure and a Saturday return, say — rather than a symmetric weekend-to-weekend trip. Do not assume both legs have to move together. When your dates have any give, ask for the fare on a couple of departure days paired with a couple of return days; the best combination is frequently not the one you would have guessed, and on domestic routes where one-ways price at about half the round trip you can even mix carriers to catch the cheap day in each direction.
How to use it
Tell the agent your dates are flexible by a day or two. Shifting a Friday departure to Thursday, or a Sunday return to Monday, is the single most reliable saving there is. Call (708) 866-8751 and ask for the cheapest day in your window.
What our day-by-day fare data shows
- Cheapest departure dayWednesdayCheapest weekday on 25% of routes
- Priciest departure dayThursdayAbout 6% above the cheapest day, route for route
- Routes analyzed411With two weeks or more of dated lows
Recomputed nightly from the fare snapshot. Read the full study.
Want a person to do this for you?
Licensed agents book, change, and cancel on every airline, 24/7, every day.
