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

Return flights

18 Sep - 23 Sep	easyJet	direct
18 Sep - 25 Sep	easyJet	direct
11 Sep - 14 Sep	easyJet	direct
25 Sep - 28 Sep	easyJet	direct
18 Sep - 21 Sep	easyJet	direct
04 Sep - 14 Sep	easyJet	direct
21 Sep - 25 Sep	easyJet	direct
23 Sep - 28 Sep	easyJet	direct
04 Sep - 07 Sep	easyJet	direct
06 Sep - 09 Sep	Wizz Air
25 Sep - 05 Oct	easyJet	direct
29 Sep - 10 Oct	easyJet

Also check the deals for one-way flights from London to Basel 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 London to Basel in September from 71€

Return flights