Flight delays are always a hassle, but the holidays add an extra layer of stress. No one wants to be stuck at the airport while their family is digging into Christmas dinner. And even if you fly long before the holiday itself, airports are always more hectic during the holiday season. Between the high volume of travelers and the whims of winter weather, getting off the ground doesn’t necessarily feel like a given when you leave for the airport.

But not all airports and days are equally prone to flight issues, according to U.S. Bureau of Transportation data from the last five years, as analyzed by the electric supply company Elite Fixtures, which previously analyzed the worst airports for Thanksgiving travel.

Elite Fixtures

On average, you’re less likely to be delayed if you’re traveling the week before Christmas or on the holiday itself, the data shows. December 25 has actually had the lowest percentage (18 percent) of delayed flights over the last five years, giving you a good excuse if you want to flee to the airport directly after your family’s holiday meal. Traveling December 18 and 19 is also a good idea, since only 26 percent of flights are typically delayed on those days.

Elite Fixtures

Beware the 22nd and 23rd of December, though. On those days, an average of 32 percent and 34 percent of flights get delayed, respectively. The few days after Christmas are also likely to stick you with an annoying delay—33 and 34 percent of flights are delayed on the 26th and 27th.

Elite Fixtures

Airlines don’t encounter flight difficulties in equal measure across all airports, though. If you’re flying through one of the airports above, congratulations! The likelihood of getting delayed is less than at the Houston or Oakland airports, both hubs with the highest rates of holiday flight delays in the U.S.

Unfortunately, no matter what day you fly and where you fly from, there's no way to really predict whether your flight will leave on time. You'll just have to hope that Santa brings you the seamless holiday travel experience you put on your Christmas list.