Fareward

Guide · checked 2026-10-11

Cheapest Day to Book a Flight: The Data, Not the Myth

Quick answer

There's no reliably cheapest day to book a flight, and the difference between days is small. In Google's 2026 analysis of five years of Google Flights data, Wednesday came out cheapest and Sunday most expensive, but booking on Wednesday saved only about 1.4%. Expedia's 2026 Air Hacks report, using its own booking data, named a different day: Friday was cheapest to book in the US, about 3% cheaper than Sunday, and for US domestic trips Saturday was cheapest, about 2% cheaper than Monday.

Two big data sets, two different "best" days, and in both cases a gap of a few percent. On a $400 ticket, 1.4% is under $6.

Where the Tuesday myth came from

The "book on Tuesday" tip is decades old. The usual explanation was that airlines loaded sales early in the week and competitors matched by Tuesday afternoon. Pricing today is far more automated and changes continuously, and the recent data no longer points to Tuesday:

Source Cheapest day to book Most expensive Difference
Google Flights (2026 analysis, 5 years of data) Wednesday Sunday ~1.4%
Google Flights (2024 analysis) Tuesday Sunday ~1.3%
Expedia Air Hacks 2026 (US overall) Friday Sunday ~3%
Expedia Air Hacks 2026 (US domestic) Saturday Monday ~2%

The "winning" day changes from year to year and from data set to data set. That's what you'd expect when the real effect is close to zero.

What saves more than the day you book

  1. The day you fly. Google found departing Monday and returning Tuesday or Wednesday saves about 14% versus weekend trips, and up to 20% on domestic trips versus Sunday-to-Sunday. Expedia found Tuesday was the cheapest day to fly domestically, about 14% less than Sunday departures. More in our cheapest day to fly guide.
  2. How far ahead you book. Google's domestic sweet spot is about 39 days out (range 22–57 days). See best time to buy plane tickets.
  3. Connecting instead of nonstop. Google found nonstops cost about 20% more on average.
  4. What happens after you book. If the fare on your exact flight drops after purchase, many airline-direct fares let you reprice and keep the difference as credit. That drop can easily be bigger than any day-of-week saving.

Why waiting for a "cheap day" can cost you

If you find a good fare on a Sunday and wait for Wednesday to save 1.4%, you're betting a few dollars against the risk that the fare bucket sells out or the price jumps. Google's own advice is not to wait for a particular weekday if the trip is close.

A better habit: book when the price is good for your dates, then keep an eye on it.

What to do instead of timing the day

  1. Set a price alert on your route before you're ready to buy.
  2. Book when the price looks typical or low for your dates, any day of the week.
  3. Book with the airline directly if you can, so changes and credits stay simple.
  4. Avoid basic economy if you want repricing. Basic fares on most US airlines can't be changed to a lower price.
  5. Watch the fare after booking. If it drops, rebook the same flight at the lower price through the airline and keep the credit. Our airline price drop guide covers each major airline.

How a post-booking drop works

On most standard economy fares from US airlines that dropped change fees, you can change to the same flight when the price falls. You pay nothing extra, and the airline keeps the difference for you, usually as a credit. The exact rules differ:

  • United and American: standard economy and up usually qualify; basic economy doesn't.
  • Delta: Main Classic and up get an eCredit for the difference.
  • Southwest: no change fees; Choice fares get flight credit, Basic must upgrade to change.
  • Alaska: main cabin and up usually qualify; Saver doesn't.

Already booked? Let Fareward keep watching

Forward your airline confirmation to [email protected]. Fareward watches the fare on your exact flights and fare type. If it drops and your fare rules allow it, Fareward files with the airline as your agent, without needing your airline password, and the savings land as airline credit in your name. It covers United, Delta, American, Alaska, Southwest and Hawaiian.

Watching is free. Fareward takes 20% of the savings, only after a credit lands. If the fare never drops, or your fare can't be repriced, you pay nothing. Because the savings usually come back as airline credit rather than cash, it works best for people who'll fly that airline again.

FAQ

What is the cheapest day to book a flight? There isn't a reliable one. Google's 2026 analysis found Wednesday cheapest, about 1.4% below Sunday. Expedia's 2026 report found Friday cheapest in the US, about 3% below Sunday.

Are flights cheaper on Tuesday? Not meaningfully. Tuesday was cheapest in Google's 2024 analysis by about 1.3%, but Wednesday edged it out in 2026. The gap between days is a few percent at most.

Is it cheaper to book flights on the weekend? Results vary by data source. Google found Sunday the most expensive day to book, while Expedia found Saturday cheapest for US domestic bookings. The difference is small either way.

What matters more than the booking day? The days you fly, how far ahead you book, and whether you take a nonstop. Google found midweek trips can save about 14%, up to 20% domestically.

Can I get money back if the price drops after I book? Often, as airline credit. Many airline-direct standard fares let you change to the same flight at a lower price and keep the difference. Basic economy usually doesn't qualify.

Related guides

Sources (checked October 11, 2026)