Here You can find a list of airlines which operated in Belfast City airport.
Birmingham International - Aer Lingus, British, Flybe
Bristol - easyJet
Cardiff Wales - Aer Lingus, British
East Midlands - Flybe
Exeter International - British, Aer Lingus
Leeds Bradford - Aer Lingus, Flybe, British
London City - British
London Stansted - Titan
Manchester - Aer Lingus, Flybe
Newcastle - Flybe
Southampton - Aer Lingus
Durham Tees Valley - Linhas A
London Heathrow - Aer Lingus, British, Flybe
Amsterdam Schiphol - KLM Royal, Flybe
Verona - Aer Lingus
Edinburgh - Flybe, Aer Lingus
Inverness - Linhas A
Glasgow International - Aer Lingus, Flybe
Düsseldorf - British
Hannover Langenhagen - British
Köln Bonn - British