The Frontier Airlines Baggage Policy is designed around the airline’s low-cost model, giving passengers the flexibility to pay only for what they need. Unlike many traditional airlines, Frontier does not include free carry-on or checked baggage with its standard tickets. Instead, every passenger is allowed one personal item for free, such as a small backpack or purse, which must fit under the seat and not exceed 14” x 18” x 8” in size. Any additional bags—including carry-ons that go in the overhead bin—must be purchased separately, with prices varying depending on when and how you add them. Booking baggage online in advance is the most cost-effective option.