There is no magic day. For most routes, book 1–3 months ahead for domestic and 2–6 months for international, earlier for peak dates. Track prices with alerts and buy when the fare hits a target you set in advance.
Airfare is dynamic and route-specific, so ‘buy on Tuesday’ advice doesn’t hold up. What does: fares are usually highest in the last three weeks, lowest in a window that depends on the route and season, and peak dates (holidays, festivals, school breaks) rarely get cheaper.
Rules of thumb:
- US domestic: 3–8 weeks ahead.
- Transatlantic: 6–12 weeks; earlier for summer.
- Asia and long-haul: 8–16 weeks; earlier for blossom or Golden Week.
- Peak dates: as early as fares open.
Method: set Google Flights alerts for your dates and a flexible variant, decide a target price, and buy when it hits. Compare total cost including bags and seats. Our route guides give windows for specific city pairs.
Related questions
What day of the week is cheapest to fly?
Tuesday, Wednesday and Saturday departures tend to price lower on many leisure routes; Friday and Sunday are usually the most expensive. It's a tendency by route, not a rule — always check the date grid. Full answer →
How do I find cheap flights?
Search flexible dates on Google Flights and Skyscanner, check nearby airports, set price alerts, consider one-stop routings and stopover programs, and compare the total cost with bags and seats — not the headline fare. Full answer →
Airline, airport and government rules change without notice. Treat this as a starting point and confirm with the airline or authority for your specific trip. Request a correction if something is out of date.