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

Return flights

29 Sep - 13 Oct	LOT
27 Sep - 11 Oct	LOT
27 Sep - 02 Oct	LOT
27 Sep - 30 Sep	LOT
27 Sep - 05 Oct	LOT
27 Sep - 04 Oct	LOT
26 Sep - 10 Oct	LOT
24 Sep - 01 Oct	LOT
25 Sep - 01 Oct	LOT
25 Sep - 02 Oct	LOT
26 Sep - 03 Oct	LOT
23 Sep - 27 Sep	LOT
25 Sep - 29 Sep	LOT
24 Sep - 26 Sep	LOT
27 Sep - 29 Sep	LOT
26 Sep - 30 Sep	LOT
26 Sep - 29 Sep	LOT
25 Sep - 30 Sep	LOT
24 Sep - 29 Sep	LOT
24 Sep - 27 Sep	LOT

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 185€

Return flights