London Air Travel » British Airways »

British Airways has launched a string of new summer seasonal routes from Southampton Airport.
These will be operated by its subsidiary BA CityFlyer, whose principal base is at London City Airport. For the past five years, BA CityFlyer has operated seasonal routes at weekends from UK regional airports. This primarily due to the closure of London City airport at weekends.
Summer seasonal routes at London Stansted and Manchester airports are cancelled next summer.

Next summer, BA will fly from Southampton to Bergerac, Berlin, Edinburgh, Faro, Florence, Ibiza, Limoges, Malaga, Mykonos, Nice and Palma de Mallorca.
Return flights typically operate 1 – 2 a week from early – mid May up to 31 October 2020. As these return flights are often “nested” in return flights from London City, it’s a safe assumption that many of these routes will operate from London City next summer.
Southampton has always seemed a logical choice given BA’s catchment in the South East. BA CityFlyer is operating a relatively high number of routes compared other regional airports previously served. No doubt the closure of Flybe is factor in BA CityFlyer choosing to fly from the airport next summer.
As these are new seasonal routes, the exact frequencies, timings and operating dates may change over the coming months according to commercial demand. There if course the unknown factor as to what travel restrictions will be in place next summer.
Flights are on sale now at ba.com
Update March 2021
BA CityFlyer has added Alicante to its planned destinations from Southampton. Flights operate weekly on Saturdays from 26 June to 30 October 2021.