Starting March 1, Frontier will limit checked bags to a maximum of 40 pounds for tickets purchased on or after Jan. 18.
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Frontier Airlines Airbus A320 takes off from Los Angeles international Airport on August 27, 2020 in Los Angeles, California.
Credit: AaronP/Bauer-Griffin/GC Images

Frontier Airlines is reducing its weight limit for check bags starting next month, a protocol that the airline attributes to its effort to go green.

Starting March 1, Frontier will limit checked bags to a maximum of 40 pounds — 10 pounds less than the carrier currently allows — for tickets purchased on or after Jan. 18, according to the airline.

"Reducing the maximum allowable weight for a standard checked bag encourages customers to avoid overpacking, which helps reduce overall aircraft weight and conserve fuel, in keeping with the mission of America's Greenest Airline," a spokesperson for Frontier Airlines told Travel + Leisure.

Passengers on Frontier may bring one personal item with them free of charge, but must pay for both carry-on bags and checked luggage. Carry-on bags can weigh up to 35 pounds.

Frontier currently charges $75 per bag, per flight for overweight checked bags that weigh up to 100 pounds. After March 1, the airline will charge $50 for bags that weigh 41 to 50 pounds, and charge $100 for bags that weigh between 51 and 100 pounds. The airline will not accept bags that weigh over 100 pounds.

Frontier's new policy is in line with fellow low-cost carriers Spirit Airlines and Allegiant, which both limit checked luggage to 40 pounds.

On the opposite end of the spectrum sits Delta Air Lines, which is testing a pilot program in Boston, allowing customers to check their carry-on bags for free in an effort to speed up the boarding process, a spokesperson for the airline confirmed to T+L.

"Just as we've tested other airport experience modifications over the years, we are conducting a month-long test on select flights from Boston starting the week of Jan. 31, 2022," he said. "Select customers who have shared contact information with Delta will receive a text message before arriving at the airport with a proactive offer to check their carry-on bags. Customers will not be required to pay any additional bag fees associated with checking the carry-on bag."

Alison Fox is a contributing writer for Travel + Leisure. When she's not in New York City, she likes to spend her time at the beach or exploring new destinations and hopes to visit every country in the world. Follow her adventures on Instagram.