Wizzair will add new routes from Warsaw to Bristol and Aberdeen next year.
The Hungary-based carrier will base a sixth aircraft in the Polish capital from May; it will be used to serve the two new UK routes, plus services to Bari, Italy and Reykjavik.
Both new UK routes will operate from May 13 with the Aberdeen flights operating on Mondays and Thursdays, and the Bristol service running on Wednesdays and Sundays.
Wizzair will also start a twice-weekly route between Birmingham and Poznan from December 18, which will operate on Mondays and Fridays.
As part of its expansion from Poland, the airline will add extra frequencies from Warsaw to existing UK routes from May 13.
Warsaw-Luton flights will be increased from 23 to 26 per week, while Doncaster flights will rise from three to four per week and the Birmingham service will go up to three weekly services from the current two per week.