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

Return flights

30 Sep - 14 Oct	Aurigny	direct
28 Sep - 02 Oct	Aurigny	direct
29 Sep - 02 Oct	Aurigny	direct
09 Sep - 16 Sep	Aurigny	direct
20 Sep - 21 Sep	Aurigny	direct
26 Sep - 29 Sep	Aurigny	direct
20 Sep - 20 Sep	Aurigny	direct
09 Sep - 10 Sep	Aurigny	direct
10 Sep - 17 Sep	Aurigny	direct
20 Sep - 24 Sep	Aurigny	direct
13 Sep - 20 Sep	Aurigny	direct
09 Sep - 12 Sep	Aurigny	direct
13 Sep - 15 Sep	Aurigny	direct

Also check the deals for one-way flights from Southampton to Guernsey 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 Guernsey in September from $222

Return flights