How Far in Advance Can You Book Flights? The Real Windows

• 331 days

  How far ahead American says its flight schedule can be booked, per its current FAQ

• 331 days

  How far out Delta says award seats may appear, per its award-travel tips

• Rolling

  How Southwest publishes its schedule-release notice rather than a single fixed day

• Not for price

  Schedule opening is when you can book, not necessarily the cheapest time to buy

“How far in advance can you book a flight” sounds like a scheduling fact, and it partly is — each airline lets you book out to a window it controls. But the widely repeated answer collapses two different questions into one. The day a schedule opens for booking and the day it is cheapest to buy are not the same, and confusing them is how travelers pay early-opening prices expecting a deal.

Every figure in this guide is a dated example from a current carrier or Google page, reviewed on 11 August 2026. The release windows can and do change, so the reliable habit is to verify the specific carrier’s current calendar before you book far out, and to treat schedule opening strictly as an availability date rather than a price signal.

The booking window is not the price window

The distinction is the spine of this guide. If you ask “how far in advance can I book,” the answer is a release date. If you ask “when is it cheap to book,” the answer requires live and historical price context. The carrier sources cited here do not establish whether an opening fare is high or low, and that price can move in either direction.

So knowing the release window answers when you can get a seat on a specific date, not when that date fares cheaply. The two facts belong in separate columns, and this page keeps them that way, pointing you to the price-window page for the value question and to the carrier for the availability question.

American: schedules up to 331 days out

American’s current reservations FAQ says its flight schedule is available for booking up to 331 days in advance, as reviewed on 11 August 2026. That is the maximum lead time American states, and it anchors the far end of what “how far in advance” can mean when the answer is measured in days rather than years.

The 331-day figure is a maximum and a compatibility point with Delta’s stated award window, not a guarantee that every route opens exactly 331 days out. A specific city pair can open at a different point, and the exact release for your route is on American’s own scheduling notice. If you need a deadline, confirm it against that current source.

What American’s figure does not do is promise a discount at 331 days. The window is about availability, and the price you will see at release is whatever the early inventory carries, which is not a cheap-fare signal on its own.

Delta: award seats may appear 331 days out

Delta’s award-travel tips say award seats may appear up to 331 days before a flight. That is specifically about award inventory, and it is the reason this guide frames Delta’s number around award seats rather than around a blanket paid-booking window.

The distinction matters because an airline can release award inventory and paid schedule on different timetables. The award window helps you know when to look for a seats-awards booking far out; the paid extension can open separately. Never assume one fixed number governs both, and check the award and paid calendars individually for the trip you are planning.

For a traveler planning an award redemption at the far end of that window, the award search tool guide covers how to find those seats once they open, while this page records that they can appear as early as 331 days out.

Southwest: a rolling, dated notice

Southwest’s answer to “how far out can I book” is not a single fixed number. The airline publishes a rolling, dated schedule-release notice instead, which tells you the current window as of today. That formatted release is why this guide does not print one permanent day count for Southwest.

The practical behavior is to read Southwest’s current schedule-release notice when you want to know how far out you can book today. Because the notice is dated and rolling, the answer changes over time, and a number captured on an older guide is likely stale.

Plan around the current notice rather than an assumed window. If you are trying to lock a specific far-out date on Southwest, open its notice and read what it says for your travel timeframe, then confirm before building a nonrefundable plan around it.

Google's tools for checking windows and prices

Google’s travel tools help with the other side of the question — seeing when to buy, not just when you can book. The price-tracking feature and the booking-window guidance in Google’s help are useful for turning a release date into a value decision, and they are part of how you watch a route between release and purchase.

Google’s travel help page on tracking flights and prices is a source for this guide because it supports the mechanics of watching a fare over time. It is not a carrier schedule release, so it answers when you should be alerting, not when a specific carrier opens bookings.

The full mechanical side of checking windows and prices is covered in the Google Flights guide. Used together, the carrier release notice tells you when a future date opens and the Google tools tell you when its price is worth acting on.

When watching beats buying

For most travelers the schedule-release answer is less actionable than what to do with it. Booking on day one can make sense when dates are fixed and certainty matters; watching can make sense when the trip is flexible. The release date enables both choices but proves neither that the fare is a bargain nor that waiting will improve it.

That is why the practical answer to “how far in advance can you book” becomes “as soon as the schedule opens, then evaluate or monitor the live fare.” The carrier calendar gives you the first answer, and a price alert can supply later observations without ever mistaking opening day for a guaranteed cheap day.

How this differs from the cheapest booking window

The cheapest booking window is a separate calculation from schedule release, and this guide deliberately does not turn one into the other. The value-window question — the range of days before departure when fares tend to be lowest — is answered by fare-history data and lives on its own page. Release dates describe availability; price windows describe value.

The best time to book guide covers that value window with the route-level data behind it. Read it when your question is really “when is it cheap,” and read this page when your question is purely “when can I book a far-out date.” They are adjacent, but they are not the same answer.

Keeping the two questions separate is what protects you from advertising that implies opening a schedule means it is a good deal. A far-out booking is sometimes necessary for availability and dates; it is not, by itself, a price strategy.

Award seats and paid seats can open differently

Award seats and paid seats can open on different schedules, as Delta’s 331-day award figure shows against a separate paid calendar. For travelers who want either, the day to look differs, and assuming a single day for both can mean missing the window on one of them.

Check the award and paid openings separately for the route you want. If an award redemption is the goal, watch the award calendar for that specific partner and route rather than a general airline-wide date, because award release is notoriously route-dependent.

If you use miles and cash side by side, price the award against the cash fare once both windows are open. The points versus cash comparison helps make that call, and the award-window timing is what this guide flags so your search starts at the right time.

Booking far out, and what to confirm

Booking at the far edge of a release window is sometimes unavoidable — to hold a seat on a specific date, secure a route that sells out, or lock a school-break itinerary. When that is the case, the trade is availability against the risk of paying early-opening prices. Do it deliberately, knowing you are choosing certainty over value.

Before committing far out, confirm the release is current, read the fare’s change and cancellation terms, and know the date is refundable or changeable enough that a later fare drop does not leave you stuck. The refundable versus nonrefundable comparison covers the flexibility side of locking a fare early.

If you do book far out, check whether the fare can be changed or refunded if the price later falls. Weigh that flexibility against the value of locking the itinerary now. The cited release-window sources do not predict the later direction of the fare.

A before-you-book checklist

1. Separate the two questions. Ask “when can I book” (a release date) and “when is it cheap” (a price window) as distinct things.
2. Confirm the carrier's current calendar. American up to 331 days for its schedule, Delta up to 331 days for award seats, Southwest a rolling dated notice.
3. Check the price window too. Read the best-time-to-book page for when the fare is likely low, not just when it opens.
4. Start alerting at release. Open the monitoring once the flight exists, and let price, not the opening date, drive the buy.
5. Treat the figures as dated examples. Release windows change; re-read the carrier notice before booking far out.
6. Confirm fare flexibility. If you book far out, know the change and refund terms in case an early price is not the low.

How far in advance you can book is decided by each airline’s schedule release: American up to 331 days out, Delta’s award seats up to 331 days, and Southwest through a rolling, dated notice. None of those is a promise that opening day is cheap — schedule release answers availability, and the price window answers value as a separate question. Confirm the current carrier calendar when you need a date, start watching once the schedule opens, and let the fare’s movement, not the calendar, tell you when to buy.