Cheapest Days to Fly: Day-by-Day Breakdown

The Short Answer

Tuesday, Wednesday, and Friday are consistently the cheapest days to fly. Sunday and Monday are the most expensive. But the day you book matters too, and that's where most people get tripped up.

Day-by-Day Breakdown

Tuesday

Tuesday has long been the king of cheap travel days. Domestic flights on Tuesdays run about 14% cheaper than Sundays. Business travelers are settled into their work week, leisure travelers aren't moving yet, and planes have empty seats to fill. It's also typically the least busy day at airports, which is a nice bonus.

Wednesday

Wednesday ties with Tuesday for the cheapest day to fly on average. The midweek lull keeps demand low, and airlines price accordingly. If you've got flexibility between Tuesday and Wednesday, check both. One will usually edge out the other depending on the route.

Friday

Here's the surprise. According to Expedia's latest data, Friday has emerged as the new cheapest day to both fly and book. The shift comes from reduced business travel at the end of the work week. Weekend leisure travelers tend to fly Saturday morning, leaving Friday flights underpriced. This is a newer trend worth watching.

Thursday

Thursday sits in the middle of the pack. It's cheaper than Sunday or Monday but won't match Tuesday or Wednesday pricing. Think of Thursday as the "decent but not great" option. If it's the only day that works for you, you're not getting ripped off, but you're not getting the best deal either.

Saturday

Saturday is a mixed bag. Early Saturday morning flights can be cheap since most leisure travelers prefer mid-morning departures. Saturday afternoon and evening flights tend to cost more as weekend getaway travelers fill seats. For domestic flights, Saturday generally falls in the moderate range.

Sunday

Sunday is consistently one of the most expensive days to fly. Everyone's heading home from weekend trips, business travelers are positioning for Monday meetings, and airlines know it. If you can push your return to Monday or Tuesday, you'll often save 15-20% on the same route.

Monday

Monday competes with Sunday for the most expensive day. Business travelers dominate Monday mornings, driving up prices on popular routes. Even leisure travelers heading home from long weekends push Monday prices higher. Avoid it if you can.

When to Book Your Flight

The cheapest day to book is different from the cheapest day to fly. According to Google data, booking on Monday through Wednesday tends to yield lower fares than booking on weekends. Some data suggests Friday is also a strong day to book, echoing the Expedia findings about end-of-week travel deals.

For timing, aim to book domestic flights about 39 days before departure. For international flights, 49 days or more in advance typically gets you the lowest prices. That said, these are averages. Flash sales and sudden price drops can happen any time.

Why Day of Week Matters Less Than You Think

Here's the truth: the day of the week is just one factor. Route, season, holidays, fuel costs, and competition all play bigger roles. A Tuesday flight during Thanksgiving week will cost more than a Sunday flight in February.

The real strategy is flexibility. If you can shift your travel by even one or two days, you'll almost always find savings. Use the fare calendar view on Google Flights or Skyscanner to see exactly how prices change day by day for your specific route.

Best Strategies for Finding Cheap Days

• Use fare calendars - Google Flights and Skyscanner both show price grids that let you compare every day of the month at a glance
• Set price alerts - Track your route and let the tools notify you when prices drop on any day
• Check nearby airports - A Tuesday flight from a secondary airport can be dramatically cheaper than the same route from a major hub
• Avoid flying around holidays - The day-of-week pricing patterns completely break down during holiday travel periods
• Consider red-eyes - Late-night departures on any day tend to be cheaper than morning and afternoon options

Domestic vs. International Differences

The Tuesday/Wednesday pattern holds strongest for domestic U.S. flights. International routes follow slightly different patterns because they're influenced by demand in both origin and destination countries.

For transatlantic flights, midweek departures (Tuesday through Thursday) still tend to be cheapest. For flights to Asia, the patterns vary more by route. Always check the fare calendar for international trips rather than assuming domestic patterns apply.

One notable difference: international round-trip fares are often priced as a package, so the departure and return days together affect the total price. A Tuesday departure paired with a Wednesday return two weeks later might be cheaper than a Thursday departure with a Sunday return. Play with different day combinations to find the sweet spot.

Time of Day Matters Too

The day of the week gets all the attention, but the time of day you fly also affects pricing. Early morning flights (before 7 a.m.) and late-night departures are generally cheaper than flights in the middle of the day. The sweet spot for expensive flights is typically between 8 a.m. and 6 p.m., when demand from both business and leisure travelers peaks.

Red-eye flights are almost always the cheapest option on any given day. If you can sleep on a plane, a Tuesday red-eye is about as cheap as domestic flying gets. Pair the cheapest day with the cheapest time, and you're stacking discounts.

Seasonal Patterns Override Everything

Day-of-week pricing is a year-round average. Seasonal demand is a much bigger pricing driver. Summer (mid-June through late August), Thanksgiving week, Christmas through New Year's, and spring break periods all see dramatically higher fares regardless of the day.

The cheapest months to fly domestically are typically January (after the 7th), February (excluding Valentine's Day weekend), September, and the first two weeks of October. If you combine a cheap month with a cheap day, you'll see the biggest savings.

Shoulder seasons work differently for international travel. Flying to Europe in early May or late September costs a fraction of July prices. Southeast Asia is cheapest during the rainy season (June through October in most countries). The "cheapest day" savings pale compared to choosing the right season.

How Airline Pricing Actually Works

Airlines don't set prices based solely on the day of the week. They use dynamic pricing algorithms that factor in remaining seat inventory, competitor pricing, historical demand for that route, fuel costs, and dozens of other variables. Two seats on the same flight can have completely different prices depending on when they were purchased.

Day-of-week trends exist because demand follows predictable patterns. Business travelers fly Monday and Friday. Leisure travelers fly Friday afternoon through Sunday. Midweek falls into a gap where neither group is moving in high volume, creating the opportunity for lower fares.

Understanding this helps explain why the "cheapest day" varies by route. A route dominated by business travelers (like New York to Chicago) shows stronger midweek discounts than a pure leisure route (like any city to Honolulu) where demand is more evenly spread.

The Bottom Line

If you want the cheapest flight, aim for Tuesday, Wednesday, or Friday departures. Book midweek, about 5-7 weeks before a domestic trip. Avoid Sunday and Monday like the plague. And use fare calendar tools to verify, because on any given route, the data might tell a different story than the averages.