Frontier's summertime deal appears to be in response to Southwest Airlines, which recently announced it will start charging for checked bags.

Frontier Airlines is introducing a free checked bag promotion in an effort to poach former Southwest passengers frustrated by the airline's decision to ditch its longstanding "bags fly free" policy.

March 18 (UPI) -- Frontier Airlines on Tuesday announced new amenities for travelers including a promotion for a free checked bag after competitor Southwest Airlines ended its free bags policy.

Frontier Airlines is offering a complimentary checked bag, carry-on, seat selection, and flight changes for nonstop flights booked by March 24. This promotion follows Southwest Airlines' recent ...

Frontier Airlines is offering a complimentary checked bag, carry-on, seat selection, and flight changes for nonstop flights booked by March 24. This promotion follows Southwest Airlines' recent ...

Frontier Airlines is offering passengers a free checked bag in a promotion taking direct aim at Southwest after the rival budget airline dropped its longtime "bags fly free" policy. On Tuesday ...

Frontier Airlines on Tuesday unveiled a free bag check promotion in a dig at Southwest, exactly one week after the rival budget carrier ended its own decades-old policy.

Frontier Airlines is stepping up its game. The airline announced Tuesday via press release that it will offer customers a free checked bag on select flights this summer. As part of its economy ...

Frontier offering free checked bag just as Southwest Airlines ends signature deal The promotion is good for Frontier flights departing between May 28 and August 18.

The promotion applies for nonstop trips booked on Frontier’s website or app. For flights departing May 28 through Aug. 18, Frontier said it would include a free checked bag.

Frontier Airlines took a swipe at Southwest Airlines’ plan to start charging for seat assignments and checked luggage by doing the opposite.