Extra summer flights are being laid on by Wizz Air to Bulgaria and Hungary from Luton airport.
Sofia will gain four additional flights to 18 a week and Burgas in Bulgaria will be served by three extra flights, bringing the schedule up to 10 a week.
Budapest will see frequency rise by seven flights to give a total of 34 a week.
The increased capacity is being offered between June 19 and mid-September.
The budget carrier also operates flights on 50 routes from six other UK airports.