Why are flights unavailable?

“Unavailable” means flights are not available for that specific date (this could be because Southwest hasn't posted their flight schedule for those dates yet). Southwest displays a “Sold Out” message when all seats under a particular fare type are gone.



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In some cases, it may mean that the seller is out of stock of the item and does not have any available to ship. In other cases, it may mean that the item is temporarily out of stock, but the seller expects to have more available in the future.

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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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There's no sugarcoating it: Airfare is expensive. And while waiting until the last minute might sound like a good idea, it typically is cheaper to book your flights in advance. We are seeing fewer last-minute deals than in years past, especially when it comes to flights, a Kayak spokesperson tells Travel + Leisure.

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Tuesdays and Wednesdays are the cheapest days to fly domestically. The cheapest days to depart if you're flying within the U.S. are midweek — generally Tuesday or Wednesday.

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Air Traffic Control Restrictions With increasing post-pandemic air travel, controllers sometimes limit flights during peak times or due to congestion resulting from flight disruptions. Air traffic controllers sometimes request an airline to cancel their flight.

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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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Is it cheaper to book a flight at the last minute? We've said this before, but it's worth repeating at the outset—no, it's really not cheaper to book a flight at the last minute. Yes, last minute travelers used to score the occasional fare so low it might have induced shock, but that's no longer the case.

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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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