AirHint found the following cheapest return flights from San Antonio (SAT) to London (LGW) in September 2025 (see full year).

Return flights

30 Sep - 07 Oct	Spirit Airlines
10 Sep - 24 Sep	Spirit Airlines
24 Sep - 18 Oct	Spirit Airlines
21 Sep - 29 Sep	Spirit Airlines
18 Sep - 02 Oct	Spirit Airlines
02 Sep - 05 Sep	Volaris
17 Sep - 30 Sep	Spirit Airlines
30 Sep - 11 Oct	Volaris
12 Sep - 27 Sep	Turkish Airlines
13 Sep - 28 Sep	Turkish Airlines
19 Sep - 04 Oct	Turkish Airlines
14 Sep - 29 Sep	Turkish Airlines

Also check the deals for one-way flights from San Antonio to London 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 San Antonio to London in September from $711

Return flights