AirHint found the following cheapest return flights from Basel (BSL) to London (LTN) in September 2025 (see full year).

Return flights

18 Sep - 22 Sep	easyJet	direct
11 Sep - 14 Sep	easyJet	direct
11 Sep - 15 Sep	easyJet	direct
04 Sep - 07 Sep	easyJet	direct
28 Sep - 30 Sep	easyJet	direct
28 Sep - 29 Sep	easyJet	direct
10 Sep - 14 Sep	easyJet
17 Sep - 24 Sep	easyJet
24 Sep - 28 Sep	easyJet
06 Sep - 08 Sep	Wizz Air
27 Sep - 05 Oct	Wizz Air
20 Sep - 11 Oct	easyJet
27 Sep - 04 Oct	easyJet
01 Sep - 31 Oct	easyJet

Also check the deals for one-way flights from Basel to London in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Basel to London in September from 63€

Return flights