A new Leeds-Bradford to Poznan route is being introduced by Ryanair.
Flights to the Polish city will run twice a week this winter.
Ryanair also announced a new route between Derry and Manchester, with three weekly flights this winter. The service will operate from December 1, 2021, to the end of March 2022.
The no-frills carrier used the launch announcement to reiterate its call for Air Passenger Duty to be scrapped or reduced.
Commercial director Jason Mc Guinness said: “APD makes UK airports very uncompetitive compared to those in Europe, where Ryanair continues to add capacity having opened several new bases in recent months, including Agadir, Zagreb, Billund, Stockholm, Riga and Turin.
“While Ryanair is committed to the UK and to Leeds-Bradford airport, the lack of government support continues to create barriers to boosting traffic and growth.”
However, he said the airline “remains committed to re-building Europe’s aviation and tourism industry by restoring connectivity and growing its network of passengers to over 225 million by 2026”.
A £19.99 seat sale will run until midnight on Saturday to mark the new routes.