Wondering how much a checked bag can weigh for Frontier Airlines? Learn Frontier Airlines' checked baggage weight limits, size restrictions, overweight baggage fees, and tips to avoid extra charges before you fly. This complete 2026 guide explains baggage allowances for domestic and international travel, plus carry-on and personal item rules. Read the latest baggage policy updates and travel smarter with TheJerseyFlights. Frontier's standard checked bag limit is generally 40 lbs (18.1 kg), with fees for overweight bags.