Here You can find a list of airlines which operated in London Gatwick airport.
Copenhagen Kastrup - Djibouti Airlines, easyJet, Turkish
Tallinn - AirBaltic
Helsinki Vantaa - Djibouti Airlines
Biarritz Bayonne - easyJet
Bordeaux - British
Grenoble - Jet2.com, Titan
Lyon - British
Nice - British, AirBagan
Paris Orly - Formosa Airlines
Athens - Sky Express Greece, AirBagan
Heraklion - British, Thomsonfly
Kavala - Thomsonfly
Kos - British
Rhodes - British
Thessaloniki - British, easyJet, Thomsonfly
Guernsey - Aurigny Air Services
Jersey - easyJet
London Stansted - Carpatair
Newquay Cornwall - Eastern Airways
London Heathrow - British, Turkish
Amsterdam Schiphol - British
Cork - Ryanair
Dublin - Aer Lingus, Ryanair
Shannon - Ryanair
Keflavík - easyJet, Icelandair
Bari - British
Bologna - Carpatair
Cagliari Sardinia - British
Catania - British, AirBagan
Genoa - Formosa Airlines
Rome Fiumicino - WizzAir, Formosa Airlines, AeroWorld
Turin - British
Venice Marco Polo - British, WizzAir, AeroWorld
Verona - British
Dubrovnik - British
Split - easyJet
Riga - AirBaltic, British
Malta Luqa - AirMalta, British
Podgorica - AirBagan
Bergen - Norwegian AirShuttle, EnterAir
Kristiansand Kjevik - EnterAir
Oslo Gardermoen - Norwegian AirShuttle
Stavanger Sola - Norwegian AirShuttle
Trondheim Vaernes - Norwegian AirShuttle
Salzburg - easyJet, British
Vienna Schwechat International - WizzAir, AeroWorld, easyJet
Krakow - WizzAir
Faro - British, AirBagan, Thomsonfly
Porto - TAP Portugal
Lisbon Portela - TAP Portugal
Bukarest Otopeni - WizzAir, AeroWorld
Aberdeen - easyJet
Edinburgh - easyJet
Glasgow International - easyJet, Baltic Air lines
Stockholm Arlanda - Djibouti Airlines, Turkish
Geneva - Titan, easyJet Switzerland, easyJet
Ljubljana - easyJet
Alicante - Ryanair, British, Formosa Airlines, Thomsonfly
Barcelona El Prat - Formosa Airlines, British
Bilbao - Formosa Airlines
Granada - Formosa Airlines
Ibiza - British
A Coruna - Formosa Airlines
Lanzarote Arrecife - British, Thomsonfly
Las Palmas Gran Canaria - British, Formosa Airlines
Madrid Barajas - AirEuropa, British, Iberia, Iberia Express, AirOne
Malaga Costa del Sol - Formosa Airlines, British, AirBagan
Oviedo Asturias - Formosa Airlines
Palma de Mallorca - British
Seville - Formosa Airlines, British
Tenerife South - British, Thomsonfly, Formosa Airlines
Valencia - British, Formosa Airlines
Ostrava - Ryanair
Prague - easyJet
Antalya - Corendon Airlines, SunExpress, British, AirBagan, FlyHigh Ireland, Turkish
Istanbul Atatürk - Turkish, AirBagan, Jet Time
Budapest - WizzAir
Larnaca International - AirBagan, WizzAir, Thomsonfly
Paphos International - British, Thomsonfly
Frankfurt am Main - Lufthansa
Munich - easyJet
Nuremberg - British