If you have yet to book your summer vacation, you're in luck: Southwest Airlines is currently running a promotion that includes both national and international flights for as low as $49 each way.
Book a trip from Los Angeles, California to El Paso, Texas for $49 or opt for a Houston-to-Mexico-City flight for $89. Flying out of the East Coast? Snag tickets to Nashville, Kansas City or St. Louis from New York's LaGuardia airport for a mere $99. Always wanted to visit Jamaica's Montego Bay? You can fly there from Baltimore/Washington for $192 or from Ft. Lauderdale for $121.
Exclusions do, of course, apply: You must travel between August 22 and December 13 (flights to Puerto Rico are only valid between September 6 and December 7), Friday and Sunday flights are excluded, expect blackout dates around Labor Day and Thanksgiving, the discounted fares only apply to nonstop flights.
You have until 11:59pm (in the respective time zone of the originating city) on Thursday, June 8 to book a flight so you might want to hurry up.