Flybe will operate a daily service between Heathrow and Guernsey Airport from March 31.
The service is the first direct flight to operate on the route in over 20 years and fares start at £21 one way.
In addition to the Heathrow service, a Newquay-Guernsey schedule has been added this summer, operated by Flybe franchise partner Blue Islands.
Flights will operate on Mondays, Wednesdays and Saturdays throughout the summer season between June 3 and August 31.
The one-hour flight makes a short stop in Jersey before continuing its path to Guernsey. Fares start from £49.99 one way.
The Newquay route follows two other recently-announced Blue Islands routes from Guernsey this summer, to Southend and Liverpool,beginning in May.