Is Tuesday really the cheapest day to fly? What 4,032 fares show

Yes, for the day you fly: Tuesday and Wednesday were the cheapest days of the week to depart in our data, each averaging 7.5% below the average fare of its own week, and Sunday was the most expensive, at 13.4% above. We priced the cheapest one-way economy fare for every date over 24 weeks of 2027 on 24 routes, 4,032 fares in all. But the rule isn’t universal: Tuesday or Wednesday was the cheapest day in 54% of weeks, so the other days won the rest.

One thing this study does not answer is which day to buy. Every fare here was collected on the same day, so we can test the day you fly, not the day you book. More on that below.

How we tested the cheapest day to fly

On November 3, 2026, we collected results from Google Flights: the cheapest one-way economy fare, for one adult in US dollars, for every departure date in two 12-week windows, January 4 to March 28, 2027 and April 5 to June 27, 2027. Both windows start on a Monday and end on a Sunday, so they hold 24 complete weeks.

We did that for 24 one-way routes, which are 12 city pairs priced in both directions:

• Domestic (16 routes): Los Angeles–New York, Atlanta–Orlando, Chicago–Las Vegas, Dallas–Denver, Seattle–San Francisco, Boston–Miami, Los Angeles–Honolulu and Denver–Phoenix.
• International (8 routes): New York–London, Miami–Cancún, Houston–Mexico City and New York–Santo Domingo.

That makes 4,032 priced days and 576 complete route-weeks (24 routes × 24 weeks = 576, and 576 × 7 days = 4,032).

A cheap week in February and an expensive week in June would swamp any day-of-week pattern if we simply averaged fares by day. So we compared each day’s fare with the average fare of its own Monday-to-Sunday week on the same route. A Tuesday fare of $90 in a week that averaged $100 scores 10% below; the same comparison works for a $900 transatlantic week. Then we averaged those scores for each day of the week.

Tuesday and Wednesday were cheapest, Sunday the most expensive

Tuesday and Wednesday tied at 7.5% below their week’s average. Every other day sat close to average except Sunday, which averaged 13.4% above:

The gap between the average and the median is worth a look. Sunday’s average (13.4% above) is much higher than its median (4.6% above). That means the typical Sunday was a few percent pricier than its week, while on some routes Sunday was dramatically more expensive and pulled the average up. As the route table below shows, the biggest Sunday premiums were on domestic routes such as Denver to Dallas.

Tuesday and Wednesday look strong on both measures: a median of 5.2% and 4.9% below the week, and an average of 7.5% below.

How often each day was actually the cheapest

Averages can hide how often a rule works, so we also asked a simpler question: in each of the 576 route-weeks, which day had the lowest fare?

Tuesday won 28.4% of the time and Wednesday 25.6%, so one of the two was the cheapest day in 54% of route-weeks. If every day were equally likely to be cheapest, each would win about 14.3% of weeks (100 ÷ 7), so Tuesday won about twice as often as chance would give (28.4 ÷ 14.3 ≈ 2.0).

Sunday was the cheapest day in only 4.4% of route-weeks, about a third of what chance would give (4.4 ÷ 14.3 ≈ 0.3). Monday and Saturday each won 12.8%, which is close to chance, and Thursday and Friday trailed at 8.2% and 7.8%.

The flip side matters just as much: in 46% of route-weeks (100 − 54), the cheapest day was not a Tuesday or Wednesday. Midweek is the best bet, not a sure thing.

What the cheapest day to fly is worth in dollars

Averaged across all routes and weeks, the cheapest one-way fare was $171 on a Tuesday, $172 on a Wednesday, $182 on a Monday, $184 on a Thursday, $186 on a Friday or Saturday, and $196 on a Sunday.

Across all routes, that makes a Sunday departure $25 more than a Tuesday ($196 − $171), and a Friday $15 more ($186 − $171). Per traveler, per flight, those gaps add up: a family of four leaving on a Sunday instead of a Tuesday would pay about $100 more on the outbound flight alone (4 × $25), if every seat moved the same way.

For a rough sense of a round trip, add two one-way averages. Out on a Tuesday and back on a Wednesday comes to $343 ($171 + $172); out on a Friday and back on a Sunday comes to $382 ($186 + $196), a $39 difference. That’s only an illustration: our data is one-way fares, and a round trip’s price depends on both days and how the airline prices the pair.

Route by route: where the day matters most

The size of the effect varied enormously by route. On some domestic routes, the day of the week could nearly double the fare. On others, including London to New York and both directions between New York and Los Angeles, it barely registered.

On Denver to Dallas, a Sunday flight averaged 56% above its week while a Wednesday averaged 21% below, so a typical Sunday fare was roughly twice a typical Wednesday fare ((100 + 56) ÷ (100 − 21) ≈ 1.97). On London to New York, the whole week sat within about 5 percentage points (from 3% below to 2% above).

Across all 24 routes, the cheapest day on average was Tuesday on 11 routes, Wednesday on 9, Monday on 3 and Saturday on 1. Thursday, Friday and Sunday were never the cheapest day on average for any route. Sunday was the most expensive day on 14 of the 24 routes.

Both directions of a pair can behave alike (Denver–Dallas was expensive on Sundays both ways), but each direction is priced on its own: New York to Los Angeles was cheapest on a Wednesday, while Los Angeles to New York was cheapest on a Tuesday.

Domestic vs international, winter vs spring

The pattern was strongest on domestic routes and in the first months of the year:

On domestic routes, Wednesday was the best day (9.3% below its week) and Sunday ran 18.6% above, so picking the right day was worth the most. On the eight international routes, every effect was smaller, and Saturday (4.7% above) was pricier than Sunday (3.0% above). Saturday was also a modest bargain at home, at 2.4% below the week on domestic routes.

In the winter window, flying midweek instead of on a Sunday mattered about three times as much as in spring. The Tuesday-to-Sunday gap was about 31 percentage points in winter (10.0 + 21.1) against about 11 in spring (4.9 + 5.8).

How this compares with Google’s advice

Google published its own day-of-week guidance in October 2026: departing on a Monday and returning on a Tuesday or Wednesday saves about 14% over weekend flights, and up to 20% on domestic routes compared with departing and returning on a Sunday.

Our data agrees on the big picture: Sunday was the most expensive day to fly, Tuesday and Wednesday the cheapest, and the gap was biggest on domestic routes. The one difference is Monday. In our one-way data, a Monday departure was only about average (0.4% below its week), well behind Tuesday and Wednesday. Google’s tip is about a round-trip combination of outbound and return days, which our one-way data can’t replicate, so both can be true.

Is Tuesday the cheapest day to book flights?

That is a different question, and this study can’t answer it. We collected every fare on a single day, November 3, 2026, which happened to be a Tuesday, so the day of purchase was the same for all 4,032 fares. What varied was the day of departure.

Google has looked at the day you buy. In the same October 2026 analysis, it said Wednesday beat Tuesday as the cheapest day to book, but the difference was negligible: buying on a Wednesday saved only about 1.4% compared with Sunday, the most expensive day to book. Put next to the 13.4% average premium we found for flying on a Sunday, that suggests the day you fly matters much more than the day you book.

How far ahead you book also matters more. In our study of 95 fares before departure, the median fare was 14.1% above its two-month price by two weeks out.

How to use this when you book

1. Price Tuesday and Wednesday first. They were the cheapest days on average and won 54% of route-weeks between them.
2. Avoid Sunday departures when you can. Sunday averaged 13.4% above its week and was the cheapest day only 4.4% of the time. On domestic routes, it averaged 18.6% above.
3. Check the days around your date, not just your date. Moving a departure from Sunday to Monday meant going from 13.4% above the week, on average, to 0.4% below.
4. Price each direction separately. A route and its reverse can have different cheapest days, and since Sunday was the priciest day to fly, a Sunday return can be the most expensive part of a trip.
5. Don’t overlook Saturday. It was the cheapest day in 12.8% of route-weeks, as often as Monday, and averaged 2.4% below the week on domestic routes. On international routes it was pricier.
6. On international trips, spend your effort elsewhere. The day-of-week effect was small there (Sunday 3.0% above the week). Timing your purchase and choosing the right fare type are likely to matter more; our basic economy study found moving up from basic economy cost a median $45.
7. Remember the midweek rule fails 46% of the time. If your search shows a cheaper fare on another day, believe the search, not the rule.

What this data can’t tell you

• The day you buy. Every fare was collected on one day, so we can’t test whether booking on a Tuesday, or any other day, is cheaper.
• Round trips. These are one-way fares. A round trip’s price depends on both days and on how the airline prices the pair.
• Other seasons and years. We searched 2027 dates in November 2026, two to eight months ahead (January 4 was 62 days out; June 27 was 236 days out). Prices closer to departure, and in July to December, may follow a different pattern.
• Holidays. We didn’t remove the weeks with holidays inside the windows (Martin Luther King Jr. Day, Presidents Day and Memorial Day), so they are part of the averages.
• Every seller and every fare. We used the cheapest economy fare Google Flights showed for each date, whatever its fare type and whoever sold it. Our cheap flight sites study looks at how sellers’ prices compare.

Paying for a cheaper midweek trip over time

A cheaper departure day lowers your trip total, and with Defera that means smaller weekly or bi-weekly payments too. Defera lets you book now and pay over time, with no credit check and no interest, and your agreed-upon trip price is secured once your booking is approved, as long as you stay in good standing on your plan. Search covers major airlines, one-way and round trip, from Economy to First.

Every Defera trip departs at least 22 days after booking, so the dates in this study, all more than two months away when we collected them, were well within range. To compare days for your own trip, search flights or read how Defera works.