Wizz Air is to start four new routes to Turkey split between Gatwick and Luton airports.
Istanbul will be served daily from both plus Antalya and Dalman from Gatwick.
The Istanbul services and Antalya start in March with Dalaman from May.
The budget carrier, which has withdrawn all flights from Cardiff airport, will serve Antalya year-round and Dalaman in the summer with four flights a week each with one-way fares starting at £35.99.
The new routes will add almost 500,000 seats to Luton and Gatwick combined.
Wizz Air now offers 30 routes from Gatwick and nearly 70 from Luton, where it is the largest airline.
UK managing director Marion Geoffroy said: “We are delighted to announce four new routes connecting passengers between London and Turkey.
“These routes reflect our commitment to bringing improved connectivity, affordable fares, and more choice to our customers in the UK, particularly as we expand our network further east.”
We look forward to welcoming customers onboard our young, efficient, and sustainable aircraft.”