If you missed out on last week's Southwest sale, it has now been extended for an additional week.

Fares are valid for domestic travel from March 16 through June 14, and again from August 22 through November 1. Travel to/from Puerto Rico is valid from September 6 through November 2.

Tickets must be booked by 11:59pm, May 11.

Please note, these fares are only available on Southwest.com. Other carriers regularly match these sale fares, so be sure to compare to find the best deal.

Fares are nonstop and include:

Baltimore to Providence $98 round-trip

Ft Myers to Boston $220 round-trip

New York to Tampa $224 round-trip

New York to Orlando $208 round-trip

New York to Kansas City $240 round-trip

Philadelphia to Ft Lauderdale $244 round-trip

Tampa to Pittsburgh $250 round-trip

Washington DC to Ft Lauderdale $156 round-trip

St Louis to Orlando $254 round-trip

Los Angeles to Phoenix $164 round-trip

Tampa to Washington DC $144 round-trip

Chicago to Boston $170 round-trip

Chicago to Detroit $138 round-trip

San Francisco to Los Angeles $118 round-trip

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