You should initiate a request for compensation as soon as your flight arrival is delayed by more than three hours, provided the delay was within the airline's control (such as technical faults or crew scheduling) rather than "extraordinary circumstances" like extreme weather or air traffic control strikes. In 2026, many regions, including the EU (under EC 261/2004) and India (under DGCA rules), have standardized these rights. For delays exceeding two to four hours (depending on flight distance), you are also immediately entitled to "duty of care" benefits, which include free meals, refreshments, and two successful phone calls or emails. If the delay forces an overnight stay, the airline must provide hotel accommodation and transport. While you can claim up to two to six years after the incident depending on the country, filing immediately at the airport or via the airline's app while details are fresh is the most effective way to ensure a timely payout.