Southwest has just cut prices on more than 50 domestic routes, and the cheap fares are on sale until midnight Thursday.

These are the rules:

– You can fly February 3 – June 3, with a few exceptions.

– Tuesday, Wednesday and Saturday flights only.

– Sale fares are one-way only; round-trip purchase not required.

– 14-day advance purchase required.

– The offer is valid until 11:59pm January 22.

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