Allegiant Travel Company announced on Tuesday that it will be expanding its airline service next year to four new markets, including the Philadelphia International Airport (PHL) and Trenton-Mercer Airport (TTN).

One-way fares for tickets at both airports are starting as low as $49 for a limited time, which could offer Phillies fans a cheap opportunity to catch a spring training game.

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New routes at PHL include flights to and from:

• Des Moines International Airport (DSM) in Des Moines, Iowa, starting May 21

• McGhee Tyson Airport (TYS) in Knoxville, Tennessee, starting May 21

• Gerald R. Ford International Airport (GRR) in Grand Rapids, Michigan, starting May 22

New routes at TTN include flights to

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