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

Return flights

25 Sep - 25 Oct	LOT	direct
30 Sep - 07 Oct	LOT	direct
30 Sep - 02 Oct	LOT	direct
30 Sep - 04 Oct	LOT	direct
30 Sep - 03 Oct	Vueling Airlines
30 Sep - 12 Oct	LOT	direct
30 Sep - 08 Oct	LOT	direct
30 Sep - 05 Oct	LOT	direct
29 Sep - 14 Oct	LOT	direct
28 Sep - 07 Oct	LOT	direct
27 Sep - 30 Sep	LOT	direct
28 Sep - 30 Sep	LOT	direct
24 Sep - 30 Sep	LOT	direct
23 Sep - 30 Sep	LOT	direct
25 Sep - 30 Sep	LOT	direct
26 Sep - 30 Sep	Brussels Airlines
29 Sep - 30 Sep	Brussels Airlines
25 Sep - 29 Sep	LOT	direct
26 Sep - 27 Sep	Brussels Airlines
24 Sep - 29 Sep	LOT	direct

Also check the deals for one-way flights from London to Warsaw 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 Warsaw in September from 175€

Return flights