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When can you book flights for September 2024?

Generally, flights are available to book around 11 months in advance, although it will differ from airline to airline. Check out our page on how far in advance you can book flights for more information.



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Most airlines let you book 11 months or more in advance, meaning you can currently book as far out as June 2024. Plus, flight prices are 19% lower than they were at this time last year, and the lowest we've seen since February 2021, on average.

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US airlines typically open their booking window around 330 days in advance, but the early bird in this case doesn't usually get the worm. Booking a ticket too early in that window can be an expensive mistake—second only in cost to booking at the last minute.

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When to Book Flights for Domestic Travel. According to a 2022 study by CheapAir.com, on average, the best time to purchase plane tickets for a domestic trip is about 76 days before your departure date. Keep in mind that this is an average — it doesn't mean you should log on exactly 76 days before travel.

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Typically, the best time to book a flight is one to two months out for domestic trips. And for international flights, the best time to book is six to eight months out. However, there are many factors that can lead to an increase (or decrease) in the price of an airline ticket.

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Is there a cheapest month to fly? If you're looking for a bargain month to travel, February is your best bet. Flights in January closely follow February for being most affordable. At the other end of the spectrum, December and July are the first and second most expensive months to travel, on average.

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Domestic airline prices are on the decline in 2023, finally retreating after spiking just a year ago. International fares are still high. After soaring in 2022, prices for domestic airline tickets are on the descent.

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How far in advance can you book a flight? The short answer is that it's mostly around 11 months, though a number of factors can influence that. You should keep in mind that advance booking dates can vary depending on a number of factors, such as whether you plan to pay cash or use miles and points to book your ticket.

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Timing plays an important part. Specifically, plane tickets usually don't get cheaper closer to the departure date. Instead, flights tend to be the most inexpensive when you book between four months and three weeks before your departure date.

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Generally, you should book domestic flights one to four months in advance. For international flights, you should book at least six months in advance. You'll want to give yourself more time for research for the latter than when traveling on domestic itineraries.

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The bottom line The short answer is that it's mostly around 11 months, though a number of factors can influence that. You should keep in mind that advance booking dates can vary depending on a number of factors, such as whether you plan to pay cash or use miles and points to book your ticket.

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Wednesdays and Thursdays are the cheapest day to fly internationally. Meanwhile, international flyers would be wise to leave on Wednesdays, which are the cheapest day to depart for an international trip. That said, there isn't a huge difference in price across the different days of the week.

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Airfare for domestic trips in September and October is averaging $211 a ticket. That's down 29% from average prices for trips in June, July and August. Known as “shoulder season,” airfare typically drops in the fall as demand cools off after the busy summer months.

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The cheapest months to travel are:
  • November – early December.
  • Late January – March.


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Beginning May 3, 2023, your driver's license will need to be REAL ID-compliant if you want to use it to fly within the U.S. It's part of a law passed by Congress. If your license is not compliant, and you don't have another acceptable form of ID, you'll have trouble getting through airport security.

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Finding the cheapest day to fly usually falls mid week on Wednesdays, but can just as easily fall on any other day of the week based on demand. Time of year also is a huge factor on ticket prices, as traveling during low or off peak seasons will see prices drop for flights.

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Early to midweek tends to be cheaper on off-peak days, and as a rule of thumb, the busier the weekend, the more the flight is going to cost. “I've found that it is generally cheaper to fly on Tuesdays, Wednesdays and Saturdays,” adds Dengler.

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Low-Cost Airlines in the US: The Cheapest and Best Airlines to Fly Domestic
  1. Southwest Airlines. Southwest Airlines is one of the largest budget carriers in the world. ...
  2. JetBlue. ...
  3. Spirit. ...
  4. Breeze Airways. ...
  5. Hawaiian Airlines. ...
  6. Avelo Airlines. ...
  7. Delta Air Lines. ...
  8. Alaska Airlines.


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