Lost my wallet at the airport and missed my flight, what now?

First, stay calm and take these steps:

Tell airline staff and airport security immediately. Airports have lost property and police desks.

Ask the airline about alternatives. Some airports have identity verification processes for passengers without ID, though it takes time.
Ask for the next flight or a date change.
Block your cards if the wallet may be stolen.
Keep proof, like a loss report, for insurance claims.

Rules differ by country, and international flights are stricter. More on missed flight refund options is here.