$55 One-Way Flights for Southwest's 55th Birthday!

Southwest Airlines is celebrating their 55th birthday with an incredible sale offering one-way fares starting at just $55.

This is a rare and highly attractive deal, especially considering the affordability of $55 for one-way flights covering US, Hawaii, and Puerto Rico destinations. The deal requires an advance purchase of 21 days, and fares are valid on select days and routes during a broad travel window from July to December 2026.

Booking is straightforward: purchase your ticket during the promotional period from June 16 at 12:01 a.m. PT through June 18 at 11:59 p.m. PT. Be sure to check the specific travel dates and blackout periods, but for those flexible with dates, this sale provides excellent value.

Given the limited time and widespread applicability across various routes, this deal presents a terrific opportunity for travelers looking for budget-friendly flights—an excellent deal worth acting on quickly.