Whether an airline must pay for a hotel depends on the location of the disruption and the reason for the delay. Under European and UK law (EC 261/2004), if your flight is delayed overnight, the airline is legally mandated to provide "Assistance and Care," which includes free hotel accommodation, transportation to and from the hotel, and meals. This applies regardless of whether the delay was caused by "extraordinary circumstances" like weather. In the United States, however, there is no federal law requiring airlines to provide hotels for delayed passengers. Most major US carriers have signed "customer service commitments" where they agree to provide a hotel if the delay or cancellation was within the airline's control (e.g., mechanical issues or crew scheduling). If the delay is due to weather or "Acts of God," US airlines are generally not obligated to pay for a room, though they may offer "discounted" hotel vouchers. For 2026 travelers, it is a "pro" tip to always keep your receipts; if an airline refuses to book a room for you during a "controlled" delay, you can often claim the cost back later through their customer relations portal.