Southwest Airlines joins a growing list of airlines hiking checked bag fees. See which carriers are increasing prices.

Southwest Airlines is raising baggage fees less than a year after ending its longtime "bags fly free" policy.

The airline's "Optional Travel Charges" page states that for mainland US travel, checked bag fees will increase by $10 for all tickets booked on or after April 9. The cost of checking the first bag will increase by about 28% to $45, while the second checked bag will cost $55.

For non-Hawaii residents, interisland travel will also come with a baggage price hike for tickets purchased on or after April 9: $30 for the first checked bag, $40 for the second.

According to the price chart Southwest published, different levels of Rapid Rewards members will maintain their original benefits without paying extra.

"As part of an ongoing analysis of the business and against the evolving global backdrop, Southwest Airlines is increasing its fees on first and second checked bags by $10, effective on all reservations ticketed or voluntarily changed on or after April 9, 2026," the airline said in a statement to CNBC.

Southwest did not immediately respond to a request for comment.

Delta Air Lines will increase fees for first and second checked bags by $10 from Wednesday, according to a statement shared with Business Insider.

For the third checked bag, fees will increase by $50. The changes apply to domestic and select short-haul international routes, and will not impact long-haul international flights or complimentary bag benefits, the airline said.

"These updates are part of Delta's ongoing review of pricing across its business and reflect the impact of evolving global conditions and industry dynamics," Delta said in the statement on Tuesday.

United Airlines said on Friday that it was raising the fees for first and second checked bags by $10. Like Delta, it said it will charge an extra $50 for third bags.

The airline said in a previously shared statement to Business Insider that this would apply to "customers traveling in the US, Mexico, and Canada and Latin America beginning with tickets purchased Friday, April 3."

JetBlue increased its checked baggage fees at the end of March.

The price of a first checked bag for a domestic flight has risen to $39 from $35 on non-peak days, and to $49 from $40 on peak travel days.

In a previous statement to Business Insider, the airline did not directly reference rising fuel prices as the reason for the fee increase, though it did note that its operating costs are rising.

"As we experience rising operating costs, we regularly evaluate how to manage those costs while keeping base fares competitive and continuing to invest in the experience our customers value," a spokesperson for JetBlue previously told Business Insider.