Alaska Airlines has teamed up with Starbucks to offer half-price flights for two days only.

It’s marketed as a buy one, get one free deal, but you must book at least two passengers at the same time to take advantage of the offer — two for the price of one.

The sale is only valid for flights between January 5 and March 9, 2022, and must be booked by 11:59 p.m. Tuesday, December 7th, at 7:00 a.m. Pacific.

The deals are valid Sundays through Wednesdays if you are traveling to Florida, Hawaii, Mexico, Costa Rica, or Belize. If you fly from those airports, the deals are only valid for flights on Tuesdays through Fridays.

When you travel on Tuesday, Wednesday, or Saturday, all other flights are discounted. (Feb. 18-22, however, are blackout dates.)

This is what you do:

Go to alaskaair.com and fill out the booking form.
Enter the promotional code STARBUCKS.
Enter the cities of your departure and arrival.
Enter your travel dates (between January 5 and March 9, 2022, must be a Tuesday, Wednesday, or Saturday to qualify for the discount).
Include at least two travelers (up to 7)
Examine the cheap Saver and Main Cabin flights (marked with a green check mark)