The Guernsey to Heathrow service has been in operation for just over a month and has carried 2,837 passengers.
This is a 5% increase in people flying to the airport.
In comparison to April 2018, figures suggest there is a 10% increase in passenger movements for all London routes, including Heathrow, Gatwick and Stansted.
Services to Southend, Liverpool, Edinburgh, Bournemouth, Newquay, and Groningen are commencing.
The States has started looking into whether the service will be continued this winter.