AirHint found the following cheapest return flights from London (LCY) to Tallinn (TLL) in September 2025 (see full year).

Return flights

20 Sep - 03 Oct	SWISS
26 Sep - 03 Oct	Lufthansa
25 Sep - 30 Sep	Lufthansa
30 Sep - 01 Oct	Lufthansa
26 Sep - 01 Oct	Lufthansa
22 Sep - 23 Sep	SWISS
22 Sep - 26 Sep	SWISS
22 Sep - 24 Sep	SWISS
22 Sep - 25 Sep	SWISS
20 Sep - 22 Sep	SWISS
29 Sep - 01 Oct	SWISS
20 Sep - 24 Sep	SWISS
24 Sep - 25 Sep	Lufthansa
30 Sep - 03 Oct	Lufthansa
24 Sep - 26 Sep	Lufthansa
25 Sep - 26 Sep	Lufthansa
27 Sep - 09 Oct	SWISS
25 Sep - 02 Oct	Lufthansa
20 Sep - 02 Oct	SWISS
30 Sep - 02 Oct	Lufthansa

Also check the deals for one-way flights from London to Tallinn 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 Tallinn in September from $373

Return flights