For flights departing from the United States, Google’s latest analysis puts the average lowest price for domestic tickets 39 days before departure and for international tickets 89 days ahead. Those are historical averages—not a guarantee for your route—and the advantage of choosing a particular day of the week to book is small. If your dates and destination are fixed, check Google Flights’ itinerary-specific booking insight and compare the full itinerary and its conditions.
When does Google say to book domestic and international flights?
Google’s October 5, 2026 analysis, based on five years of aggregated Google Flights data, concerns departures from U.S. airports. It reports these average low points and low-price ranges:
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| Trip type | Average lowest price | Reported low-price range |
|---|---|---|
| U.S. domestic | 39 days before departure | 22–57 days before departure |
| U.S. international | 89 days before departure | 50–133 days before departure |
For international flights, Google says the average price drop across that 50–133-day range is insignificant and recommends booking as soon as possible. In other words, 89 days is not a reliable deadline to wait for: an individual route may not follow the average, and waiting could mean paying more or losing a suitable itinerary.
Google’s 2026 article also gives averages for selected trip types. These are still U.S.-departure averages, not guarantees for a particular destination or date:
| Trip type | Average low point | Reported low-price range |
|---|---|---|
| Thanksgiving | 34 days ahead | 21–57 days ahead |
| Christmas | 56 days ahead | 33–67 days ahead |
| Spring break | 50 days ahead | 29–64 days ahead |
| Summer vacation | 21 days ahead | 20–47 days ahead |
| Europe | 90 days ahead | 49 or more days ahead |
| Mexico or the Caribbean | 43 days ahead | 24–69 days ahead |
All figures in these tables come from Google’s 2026 analysis: Wheels up: Trends and tips for 2026 holiday travel. The article describes five years of aggregated data but does not restate a detailed sample method. Google’s separate 2025 methodology covered observed fares from January 1, 2021, through August 1, 2025, for round trips of four to 16 days departing from the top 4,000 U.S. markets. That earlier method should not be assumed to apply unchanged to the 2026 figures.
Does the day you book matter?
In Google’s 2026 analysis, Wednesday was the cheapest weekday to book and Sunday the most expensive, but the difference was only about 1.4%. That is a modest historical average, not a reason to delay a purchase when you find an itinerary that fits your needs at an acceptable price.
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The day you fly showed a larger reported difference. Departing Monday and returning Tuesday or Wednesday was associated with about 14% savings compared with weekend flights; for domestic trips, savings were up to 20% compared with departing and returning Sunday. These are averages from Google’s analysis, not savings every traveler will see. If your schedule is flexible, compare nearby dates before focusing on which weekday to buy.
How to use Google Flights for a specific trip
- Search your actual route and dates. Google’s national averages describe broad patterns; they cannot say whether a particular flight is currently cheap.
- Look for the “cheapest time to book” insight. Google says this itinerary-specific feature compares current prices with prior years and indicates whether fares are likely to rise or fall.
- Compare nearby departure and return dates. If you have flexibility, check whether shifting either date changes the total fare and itinerary.
- Compare the “Best” and “Cheapest” tabs. “Best” weighs price, convenience, duration, stops, and airport changes. “Cheapest” prioritizes low price and may surface trade-offs such as a self-transfer or a change of airport.
- Review the seller and booking conditions before choosing. Google Flights compares offers from more than 300 airline, online travel agency, and aggregator partners, but says its results may not include every available offer. Check the fare and conditions with the seller before booking.
Google cautions that its price predictions rely on historical trends and may not match future fares. Treat the insight as guidance rather than a promise. For fixed plans, Google’s published advice is: “When your dates are already set, booking early is the safest bet to protect your itinerary.” The sentence appears in the 2026 article by James Byers, Group Product Manager, Search.
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Compare the whole itinerary, not just the fare
A low headline price can come with a less convenient or more complicated trip. Google reports that nonstop tickets were 20% more expensive on average than connecting flights in its 2026 analysis. Whether a connection is worth the difference depends on the total journey and its conditions.
- Total price: Compare the fare and any relevant costs shown by the seller.
- Dates and times: Check both departure and return options, including nearby dates if you can shift your plans.
- Stops and duration: Weigh a lower fare against additional stops and longer travel time.
- Airport changes and transfers: Check whether a connection requires changing airports or transferring yourself and your luggage.
- Seller and conditions: Review whether the booking is with an airline or another seller, along with the applicable booking terms.
Google’s explanation of its results and trade-offs is available in How to find the best fares with Google Flights.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the booking averages can—and cannot—tell you
The useful takeaway is not to wait for one magic weekday or to treat a single average as a fare forecast. Google’s figures summarize historical pricing patterns for U.S. departures. They can help set expectations, while the dates, route, seller, and conditions for your specific trip determine whether an offer works for you. Google’s earlier 2025 article noted that U.S. searches for “best time to book flights” reached an all-time high that summer; its newer analysis answers the question with averages, but not with a universal rule.
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