Gatwick Express non-stop services from central London will return from April 3 with a reduced frequency.
Two trains an hour will run non-stop between London Victoria and Gatwick.
The service previously ran with four trains an hour but an ongoing upgrade of the airport’s railway station means there are not enough platforms available to accommodate them all.
The station is being rebuilt to improve accessibility, reduce passenger congestion and cut delays for travellers using the Brighton mainline. It is due to be finished next year.
The service is timetabled to run seven days a week but weekend engineering work will affect this, the company cautioned.
Services were first suspended in March 2020 as the pandemic took hold and passenger numbers at the airport tumbled.
The direct rail link to the airport initially resumed on weekdays on December 12 before being curtailed again two weeks later due to Christmas engineering work and then the impact of the Omicron variant of Covid.
Gatwick Express managing director Stephen MacCallaugh said: “We’re absolutely delighted to bring back our non-stop Gatwick Express service from Sunday 3 April as we look forward to a busier summer season including for international travel.
“With more passengers now returning to Gatwick by rail and the South Terminal reopening, now is the time to get our service running again to support the airport and the economic recovery in the south-east.”
Gatwick head of real estate and surface access Emma Rees added: “The return of Gatwick Express is great news and we’re really looking forward to the completion of the upgraded railway station.
“People are flying from Gatwick in ever-increasing numbers and excellent rail links which have a dedicated service specifically for airport passengers are a vital element of our recovery and our link into central London and beyond.”