BBC News - Katy Austin
British Airways will cut roughly 10,000 short-haul flights to and from Heathrow Airport between late October and March.
The move is aimed at minimising disruption over the winter and some long-haul flights will also be affected, the airline said.
BA said it will also cut a dozen round-trips per day - totalling 629 flights - until the end of October.
Heathrow, which is BA's main hub, has capped passenger numbers flying from the airport due to staff shortages.
BA said it was "protecting key holiday destinations over half-term".
Most cancellations will be on routes which have other daily services to the same destinations, it said in a statement.
Passengers affected by the changes will be offered an alternative flight with BA or another airline or a refund, it added.