The Cheapest Days to Fly in 2026 (Backed by Data)

Everyone wants cheaper flights, but the old advice of "book on a Tuesday" no longer holds up. Airline pricing has changed dramatically in the last few years, and the data now points to surprising new patterns for when flights are cheapest.

We dug into the latest reports from <a href="https://www.expedia.com/newsroom/expedia-2026-air-hacks/">Expedia's 2026 Air Hacks</a>, Google Flights, Hopper, and other industry sources to find the actual cheapest days to fly, the best day to book flights, and the cheapest months of the year. Here is what the numbers say.

Cheapest Days of the Week to Fly

According to the 2026 Expedia Air Hacks report, <strong>Friday has emerged as the cheapest day to fly</strong> for both domestic and international routes. This is a major shift from the long-held belief that midweek flights are always cheapest. Friday departures are now <strong>14% cheaper than Sunday</strong> for domestic flights and <strong>8% cheaper for international flights</strong>.

That said, midweek travel is still a strong option. Google Flights data shows that flying Monday through Wednesday is about <strong>13% cheaper than weekend travel</strong> on average. Tuesday remains the <strong>least busy day to fly</strong>, which often translates to lower fares and a more comfortable experience at the airport.

<table><thead><tr><th>Day</th><th>Domestic Savings vs. Sunday</th><th>Busyness Level</th></tr></thead><tbody><tr><td>Monday</td><td>~10%</td><td>Moderate</td></tr><tr><td><strong>Tuesday</strong></td><td>~12%</td><td><strong>Lowest</strong></td></tr><tr><td>Wednesday</td><td>~11%</td><td>Low</td></tr><tr><td>Thursday</td><td>~7%</td><td>Moderate</td></tr><tr><td><strong>Friday</strong></td><td><strong>~14%</strong></td><td>Moderate-High</td></tr><tr><td>Saturday</td><td>~5%</td><td>High</td></tr><tr><td>Sunday</td><td>Baseline (most expensive)</td><td>Highest</td></tr></tbody></table>

The key takeaway: <strong>Sunday is consistently the most expensive day to fly.</strong> If your schedule allows any flexibility at all, shifting your departure by even one day can save you a meaningful amount.

The Cheapest Time of Day to Fly

Departure time matters too. <strong>Early morning flights (before 7 a.m.) and late-night red-eye flights (after 9 p.m.)</strong> are consistently among the cheapest options. These times are less popular with leisure travelers and families, so airlines lower prices to fill seats.

Mid-morning and afternoon departures (10 a.m. to 4 p.m.) tend to command premium pricing because they are the most convenient for most travelers. If you are willing to set an early alarm or arrive late at night, you can often save $30 to $80 per ticket on domestic routes.

One exception: on heavy business travel days like Monday and Thursday mornings, early flights can actually be more expensive due to corporate demand. Check prices across multiple time slots before committing.

Best Day of the Week to Book Flights

The old wisdom said to book on Tuesdays. That is no longer backed by data. According to the <a href="https://www.expedia.com/newsroom/expedia-2026-air-hacks/">2026 Expedia Air Hacks report</a>, <strong>Friday is now the best day to book flights</strong>, not just the best day to fly. Booking on Friday yields domestic fares that are <strong>14% cheaper</strong> than booking on Sunday.

Hopper's consumer travel experts confirm there is no single "golden rule" day to book anymore. Airline pricing algorithms adjust fares in real time based on demand, competition, and inventory, meaning the best deal could appear on any day.

The most practical advice: <strong>set up price alerts</strong> on Google Flights or Hopper, and subscribe to deal newsletters like <a href="https://fridayflightdeals.com">Friday Flight Deals</a> that surface the best fares each week. Book when the price drops, regardless of what day it is. Waiting for a specific day of the week is less effective than monitoring fares over a two to three week window.

Cheapest Months to Fly in 2026

Seasonality has a far bigger impact on flight prices than the day of the week. According to industry data, <strong>August is the cheapest month to fly in 2026</strong>, saving travelers an average of <strong>$120 per ticket</strong>, which is 29% less than December fares.

Beyond August, <strong>January, February, and early March</strong> consistently offer the lowest fares worldwide. These months fall in the post-holiday travel lull when demand drops significantly. September and early November (before Thanksgiving) are also reliably affordable.

<table><thead><tr><th>Month</th><th>Price Level</th><th>Notes</th></tr></thead><tbody><tr><td>January</td><td>Low</td><td>Post-holiday lull, great deals</td></tr><tr><td>February</td><td>Low</td><td>Cheapest for international travel</td></tr><tr><td>March</td><td>Medium</td><td>Prices rise mid-month for spring break</td></tr><tr><td>April</td><td>Medium</td><td>Easter can spike prices</td></tr><tr><td>May</td><td>Medium-High</td><td>Memorial Day weekend premium</td></tr><tr><td>June</td><td>High</td><td>Summer travel peak begins</td></tr><tr><td>July</td><td>High</td><td>Peak summer pricing</td></tr><tr><td><strong>August</strong></td><td><strong>Lowest</strong></td><td><strong>Best deals of the year</strong></td></tr><tr><td>September</td><td>Low</td><td>Post-Labor Day drop</td></tr><tr><td>October</td><td>Medium</td><td>Shoulder season, decent deals</td></tr><tr><td>November</td><td>Medium-High</td><td>Thanksgiving spike late month</td></tr><tr><td>December</td><td>Highest</td><td>Holiday premium, especially mid-month</td></tr></tbody></table>

Travelers who fly midweek during an off-peak month can stack savings. Flying on a Wednesday in January or September can cost <strong>$56 or more less per ticket</strong> than a weekend flight in June, according to Hopper data.

How Far in Advance Should You Book?

Booking too early is just as costly as booking too late. The data shows clear sweet spots depending on whether you are flying domestic or international.

<strong>Domestic flights:</strong> Book <strong>15 to 60 days before departure</strong>. Expedia's data shows the optimal window is 34 to 86 days out, which can save up to 25% compared to last-minute bookings. Fares typically hit their lowest point about two months before departure, then climb steeply in the final two weeks.

<strong>International flights:</strong> Book <strong>1 to 5 months before departure</strong>. Google Flights data suggests international fares are cheapest at least 49 days out. For long-haul destinations like Asia or Oceania, booking 5 to 7 months ahead often yields the best prices.

The worst time to book? Within 7 days of departure for domestic flights and within 14 days for international. Last-minute fares can be <strong>30 to 50% higher</strong> than the lowest available price.

Domestic vs. International Timing Differences

Domestic and international flights follow different pricing rhythms, and conflating them is a common mistake.

For <strong>domestic flights</strong>, pricing is heavily influenced by business travel demand. Fares tend to drop on routes with heavy leisure traffic (Florida, Las Vegas, Hawaii) during shoulder seasons. The midweek savings are also more pronounced on domestic routes, with Wednesday flights saving an average of <strong>$56 per ticket</strong> compared to weekends.

For <strong>international flights</strong>, seasonality and fuel costs play a bigger role than day-of-week patterns. The Friday booking advantage is smaller internationally (8% vs. 14% domestically). Long-haul international fares are also more sensitive to how far in advance you book, making the 3 to 5 month window more critical.

One important pattern: <strong>positioning flights</strong> (one-way tickets to a hub city for a separate international booking) can be significantly cheaper midweek. If you are building your own connections, check Tuesday and Wednesday departures to major hubs like JFK, LAX, or ORD.

Airline-Specific Booking Tips

Different airlines have different pricing behaviors that are worth knowing about.

<strong>Southwest Airlines:</strong> Southwest does not appear on Google Flights or most aggregators. You must check <a href="https://www.southwest.com">southwest.com</a> directly. Their fares often drop without warning, and they offer free cancellation and rebooking, making it safe to book early and rebook if the price drops.

<strong>Delta Air Lines:</strong> Delta tends to price higher on popular business routes but offers competitive fares on leisure routes during off-peak months. Their "Best Fare Guarantee" means they will match a lower fare if you find one within 24 hours of booking.

<strong>United Airlines:</strong> United's dynamic pricing is aggressive, so prices can swing significantly within a single day. Set alerts rather than checking manually. Their Basic Economy fares are often the cheapest but come with significant restrictions.

<strong>Budget carriers (Spirit, Frontier, Allegiant):</strong> These airlines dominate the "cheapest fare" rankings but only if you travel with minimal luggage. Once you add bags and seat selection, the total price often matches or exceeds legacy carriers. Compare total costs, not just the base fare.

<strong>International carriers:</strong> Airlines like Norwegian, PLAY, and TAP Air Portugal frequently run flash sales on transatlantic routes. Follow them on social media or sign up for fare alert services like <a href="https://fridayflightdeals.com">Friday Flight Deals</a> to catch deals that last only 24 to 48 hours.

Holiday Flight Pricing Patterns

Holiday travel consistently costs more, with fares averaging <strong>56% higher per one-way flight</strong> compared to a normal week. But strategic timing can still save you hundreds.

<strong>Thanksgiving:</strong> Book by mid-October for the best prices. Fares typically hit their lowest point about 39 days before Thanksgiving. The cheapest days to fly are the Monday or Tuesday before Thanksgiving and the following Sunday. Flying on Thanksgiving Day itself is almost always the cheapest option.

<strong>Christmas and New Year's:</strong> Book by Halloween for the best deals on December travel. Flying on Christmas Day or New Year's Day is significantly cheaper than the surrounding days. Expect to save <strong>up to $140</strong> by booking early versus waiting until November or December.

<strong>Spring break:</strong> Prices spike from mid-March through mid-April. Book at least 2 months in advance and consider traveling during the first or last week of the window, when demand is lower.

<strong>Summer peak (June-July):</strong> The most expensive period for family travel. Book 3 to 4 months ahead and look for departures on Tuesday or Wednesday to offset peak-season pricing.

How to Use FlightQueue to Find Cheaper Flights

While <a href="/">FlightQueue</a> is not a fare search engine, our real-time airport busyness data can help you identify when airports and routes are less crowded, which often correlates with lower fares.

<strong>Check airport traffic patterns:</strong> Use FlightQueue to see which days and times your departure airport is least busy. Lower traffic days typically mean fewer travelers competing for the same seats, which keeps prices down. If you see that a particular airport is consistently quieter on Tuesdays and Wednesdays, those are likely your best bet for cheaper fares on routes from that airport.

<strong>Spot off-peak windows:</strong> Our flight volume data shows when airports experience dips in traffic between seasonal peaks. These shoulder periods are goldmines for affordable flights. For example, the week after Labor Day and the first two weeks of December (before the holiday rush) often show noticeably lower traffic on FlightQueue.

<strong>Compare airports:</strong> If you have multiple airports within driving distance, use <a href="/">FlightQueue</a> to compare their current traffic levels. A less congested nearby airport may not only offer a better travel experience but could also have more competitive fares due to lower demand.

Frequently Asked Questions

<strong>What is the cheapest day of the week to fly?</strong> According to 2026 data from Expedia, Friday is now the cheapest day to fly domestically (14% cheaper than Sunday). Tuesday through Wednesday also remain strong budget options and have the added benefit of being the least busy days at airports.

<strong>What is the best day to book flights?</strong> Friday is currently the best day to book both domestic and international flights based on Expedia's 2026 analysis. However, price alert tools are more effective than waiting for a specific day, since airline pricing algorithms adjust fares continuously.

<strong>What is the cheapest month to fly?</strong> August is the cheapest month to fly on average, with savings of about $120 per ticket compared to December. January, February, and September are also consistently affordable.

<strong>When are flights most expensive?</strong> December (holiday season), June and July (summer peak), and the days immediately surrounding Thanksgiving are the most expensive times to fly. Sunday is the most expensive day of the week.

<strong>Is it cheaper to fly at night?</strong> Yes, generally. Red-eye flights departing after 9 p.m. and early morning flights before 7 a.m. are typically cheaper because demand is lower at those times.

<strong>How far in advance should I book a flight?</strong> For domestic flights, 15 to 60 days in advance. For international flights, 1 to 5 months ahead. Booking too early (6+ months) or too late (under 2 weeks) both result in higher prices.

<strong>Are Tuesday flights still the cheapest?</strong> Not necessarily. While Tuesday is still the least busy day to fly, Friday has overtaken it as the cheapest day based on 2026 data. The "book on Tuesday" advice is largely outdated.

<strong>Do flight prices go down on certain days?</strong> Airlines adjust prices continuously based on demand, not on a fixed weekly schedule. The best strategy is to monitor prices with alert tools like Google Flights or Hopper rather than checking on a specific day.

The Bottom Line

The rules for finding cheap flights have shifted. Friday has replaced Tuesday as the cheapest day to both fly and book. August and January are your best months. Booking 1 to 3 months ahead for domestic and 3 to 5 months for international travel hits the pricing sweet spot.

But the single most effective strategy is not about picking the right day. It is about <strong>being flexible and using price alerts</strong>. Set up tracking on Google Flights, check <a href="/">FlightQueue</a> for airport busyness patterns, and book when the price drops rather than waiting for a mythical "best day" that no longer exists.