For most major airlines, you can buy tickets approximately in advance. While this is the standard window for full-service carriers, budget airlines often use a shorter or more irregular schedule. Typical Booking Windows by Airline Type
Airlines such as Southwest, Frontier, and Spirit do not have a fixed 11-month window. For example, Southwest Airlines typically releases seats in blocks about 8 to 10 months ahead. European budget carriers like Ryanair may only open bookings 6 to 9 months in advance. The "Goldilocks Window" for Best Prices how far in advance can you buy airline tickets
Many major international airlines, including British Airways and Lufthansa, release flights up to 355–362 days out. For most major airlines, you can buy tickets
Airlines like American Airlines , Delta , and United typically open bookings 330–331 days before departure. For most major airlines