I spent over $2,000 on a recent round-trip flight to Hawaii on Alaska Airlines. I thought I was treating myself to first class, but it was very basic.

The sale ends tomorrow, Jan. 9, at 11:59 p.m. PT and is available for travel dates between Jan. 28 and March 19. Hundreds of routes are on sale, according to the airline, with the lowest one-way fares bookable for $39 or 4,000 miles and minimal taxes and fees.

Grab some of the most valuable types of airline miles out there via an increased bonus on the Alaska Airlines Business credit card. Here are the details.