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

Return flights

20 Sep - 03 Oct	KLM
20 Sep - 29 Sep	KLM
20 Sep - 30 Sep	KLM
20 Sep - 26 Sep	KLM
20 Sep - 02 Oct	KLM
29 Sep - 05 Oct	easyJet
15 Sep - 20 Sep	easyJet
28 Sep - 03 Oct	Aer Lingus
20 Sep - 28 Sep	KLM
15 Sep - 21 Sep	easyJet
26 Sep - 30 Sep	easyJet
13 Sep - 05 Oct	KLM
13 Sep - 21 Sep	KLM
13 Sep - 20 Sep	KLM
13 Sep - 19 Sep	KLM

Also check the deals for one-way flights from Southampton 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 Southampton to Warsaw in September from 234€

Return flights