Icelandic start-up carrier Wow Air will add one extra flight per day between London Gatwick airport and Reykjavik on 2 June.
The number of weekly flights operated by Wow on the route will increase from six to 13.
Wow Air acquired rival Iceland Express in October, absorbing the latter's operations into its own scheduled network. Its fleet will double to four Airbus A320s in March.
According to Innovata schedules, Wow Air competes with Icelandair on the London Gatwick-Reykjavik route.