What are the cheapest days of the week to fly?

Short answer: for domestic flights, Tuesday and Wednesday are consistently the cheapest days to fly, with Saturday close behind. Sunday is typically the most expensive day to depart, followed by Friday and Monday. For international flights, the pattern is flatter, but midweek — and notably Friday on some analyses — tends to beat Sunday.

The day you fly matters more than the day you book. That's the single most useful thing to know, because most fare folklore is about when to buy. The evidence for cheap travel days is much stronger than the evidence for cheap booking days.

Here's what the data actually says.

Domestic: Tuesday and Wednesday win

Expedia's 2026 air travel data found that flying domestically on a Tuesday saves roughly 14 percent compared to departing on a Sunday — turning a $500 Sunday ticket into about $430 on a Tuesday. Google's research lands in the same neighborhood, finding Monday-through-Wednesday departures about 13 percent cheaper than weekend flying. Other analyses put the Tuesday advantage as high as 20-plus percent over peak Sunday prices, worth roughly $85 a ticket on average economy fares.

The mechanism is simple supply and demand. Business travelers fly out Monday morning and home Thursday or Friday. Leisure travelers leave Friday and return Sunday. Tuesday and Wednesday sit in the trough between those two waves — fewer people want those seats, so airlines price them to fill the plane.

Saturday is the interesting third option: it's a weekend day with weekday-like prices on many routes, because most travelers prefer to depart Friday or return Sunday. If midweek travel is impossible, Saturday departures are often the best compromise. Monday mornings deserve a special warning, though — they carry business-traveler demand similar to Friday evenings, so the Monday 7 a.m. flight is frequently priced like a peak flight even though it's technically a weekday.

International: flatter, but midweek still helps

International pricing follows the same logic but with a smaller gap. Expedia's 2026 data found Friday departures cheapest for international trips — about 8 percent less than Sunday, the priciest day. A $1,200 Sunday international ticket might be $1,104 on a Friday. Other analyses point to Tuesday-through-Thursday as the sweet spot, with savings around 10 to 12 percent versus Sunday.

The international gap is smaller because long-haul flights have less day-of-week variation in demand — a Tuesday flight to Tokyo is still full of people who planned months ahead. But the direction is consistent: avoid Sunday departures, lean midweek, and you'll usually do better.

Note that "international" varies enormously by route. The day-of-week effect is strongest on competitive routes with many daily flights (New York to London) and weakest on routes with limited service, where the schedule gives you little choice anyway. It's also worth knowing that the return leg matters as much as the outbound — a cheap Tuesday departure paired with a pricey Sunday return gives back much of the savings. When you can, build the whole round trip around off-peak days in both directions.

Seasons matter more than weekdays

Zoom out from the weekly pattern and the calendar matters even more. The cheapest months to fly are generally November through early December (excluding Thanksgiving) and late January through March — the shoulder seasons when demand dips. Summer and the December holidays are the most expensive periods of the year, and no weekday trick overcomes that.

This interacts with the weekly pattern in a useful way: a Tuesday flight in mid-February stacks the cheapest day onto the cheapest season, while a Sunday flight in July stacks the most expensive day onto the most expensive season. The spread between those two extremes can easily be double the fare for the same route. If you have real flexibility — retirees, remote workers, anyone without school-calendar constraints — traveling off-season dwarfs every other savings tactic.

Within Europe specifically, the same logic holds: mid-October through March (outside Christmas) is typically the cheapest window for transatlantic fares, with Tuesday and Wednesday departures adding a further discount on top.

The day you book barely matters

Here's the myth to retire: there is no magic day or hour to buy plane tickets. The old advice about buying on Tuesdays at midnight comes from an era when airlines loaded fare sales on a weekly cycle. Modern pricing is run by software that reprices continuously based on how full the flight is — fares can change multiple times a day, any day of the week.

What the data does support is the booking window: how far ahead you buy. For domestic flights, the sweet spot is generally around 28 to 44 days before departure, with most experts agreeing you shouldn't wait past 21 days out. Booking too early (several months ahead) can mean paying before the cheaper fare buckets open; booking in the last two weeks is when prices climb fastest. International flights reward earlier booking — two to three months out is a common guideline for long-haul routes.

So the practical rule: pick your travel dates for cheap flying days first, then buy in that three-to-six-week window. The day of the week you click "purchase" is nearly irrelevant.

Time of day matters too

Within a given day, the least popular departure times are the cheapest. Early morning flights — the 6 a.m. departures most travelers avoid — and red-eyes on international routes are consistently discounted because airlines need to fill seats at hours nobody wants.

Mid-morning and late-afternoon flights are the priciest, since they suit both business schedules and leisure preferences. If you can tolerate an alarm clock, the first flight out is often meaningfully cheaper than the 10 a.m. one on the same route.

This compounds with the day effect: a Tuesday 6 a.m. departure stacks the cheapest day with the cheapest time. The savings aren't always dramatic individually, but combined they add up — especially for families buying three or four tickets.

Flexibility tools that do the work for you

If your dates are even slightly flexible, use the tools built for this. Google Flights' date grid and price calendar show you fares across days and weeks at a glance — the visual makes the Tuesday-versus-Sunday gap obvious. Most airlines' own sites have flexible-date search too.

Set price alerts rather than checking manually. Google Flights, Hopper, and Going (among others) will notify you when fares drop on routes you care about. Going's deal data, for instance, shows Wednesday as the most common departure day for their discounted fares — consistent with the broader pattern.

One more flexibility lever: alternate airports. Flying into or out of a secondary airport in a metro area can beat the day-of-week effect entirely. Always compare the total — a cheaper fare plus a $60 rideshare to a distant airport isn't always a win. And check Southwest separately if it serves your route: its fares don't appear in Google Flights, so the calendar view can miss the cheapest option of all.

When the rules bend

These patterns are averages, and averages hide exceptions. Holiday periods — Thanksgiving, Christmas, spring break — overwhelm day-of-week effects; everything is expensive, and the "cheap" Tuesday of Thanksgiving week is still pricey. Book holidays as early as you can and worry less about the weekday.

One-way versus round-trip pricing can also distort things, as can basic economy restrictions. And on some routes, low-cost carriers with limited schedules simply don't offer the full weekly spread — if the airline only flies your route four days a week, you take what's available.

Nonstop versus connecting: the hidden tradeoff

One more day-of-week-adjacent decision: connecting flights are often cheaper than nonstops on the same route, sometimes dramatically. Airlines price nonstops at a premium because travelers prefer them. If saving money matters more than saving two hours, compare the connecting option.

But weigh it honestly. A connection adds delay risk — a missed connection can strand you overnight — and turns a three-hour trip into a six-hour one. For short domestic hops, the savings rarely justify the hassle; for expensive international routes, a single connection can save hundreds per ticket. As with everything in airfare, the right answer depends on the route, the price gap, and how much you value your time.

The deeper truth: the cheapest flight is usually the one you planned ahead. Travelers who book early, stay flexible on dates, and avoid peak days consistently pay less than travelers chasing booking-day myths or waiting for last-minute deals that rarely come anymore.

The calm takeaway: fly Tuesday or Wednesday when you can, Saturday when you can't, and avoid Sunday departures. Buy three to six weeks out, set a price alert, and stop worrying about which day you click buy. The calendar does more work than the clock — and the travelers who consistently pay the least are the ones who plan around demand instead of fighting it.