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

Return flights

15 Sep - 21 Sep	easyJet
21 Sep - 05 Oct	Aer Lingus
19 Sep - 21 Sep	easyJet
22 Sep - 24 Sep	easyJet
21 Sep - 28 Sep	Aer Lingus
26 Sep - 28 Sep	easyJet
25 Sep - 28 Sep	easyJet
12 Sep - 14 Sep	easyJet
28 Sep - 02 Oct	Aer Lingus
25 Sep - 02 Oct	easyJet
14 Sep - 21 Sep	easyJet
21 Sep - 24 Sep	Aer Lingus
28 Sep - 26 Oct	easyJet	direct
18 Sep - 21 Sep	easyJet
21 Sep - 05 Oct	easyJet	direct
21 Sep - 12 Oct	easyJet	direct
27 Sep - 02 Oct	easyJet
18 Sep - 05 Oct	easyJet	direct
25 Sep - 05 Oct	easyJet	direct
28 Sep - 05 Oct	easyJet	direct

Also check the deals for one-way flights from Southampton to Alicante 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 Alicante in September from 127€

Return flights