Southwest is celebrating its 46th birthday with tickets for as little as $39 one-way to destinations across the US.
Availability varies depending on the route but most sale prices are available on flights departing Monday through Thursday between August 22nd and December 16th.
The cheapest fares can be found on short, regional trips like $39 flights between Reno, Nevada and Oakland but there are also some longer flights for just $99.
To book one of these cheap seats, reservations must be made by June 15 at 11:59 p.m. in the time zone of the departure city.