AirHint found the following cheapest return flights from Dallas-Fort Worth (DFW) to London (LHR) in September 2025 (see full year).

Return flights

09 Sep - 23 Sep	Spirit Airlines
23 Sep - 07 Oct	Spirit Airlines
11 Sep - 18 Sep	Spirit Airlines
03 Sep - 12 Sep	Spirit Airlines
09 Sep - 16 Sep	Spirit Airlines
23 Sep - 08 Oct	Air Canada
21 Sep - 01 Oct	Air Canada
30 Sep - 14 Oct	Air Canada
09 Sep - 22 Sep	Spirit Airlines
23 Sep - 15 Oct	Air Canada
21 Sep - 14 Oct	Air Canada
23 Sep - 14 Oct	Air Canada
23 Sep - 30 Sep	Frontier Airlines
06 Sep - 09 Sep	Spirit Airlines
14 Sep - 24 Sep	Spirit Airlines
24 Sep - 14 Oct	Air Canada
24 Sep - 08 Oct	Air Canada
30 Sep - 21 Oct	Air Canada
13 Sep - 24 Sep	Spirit Airlines
11 Sep - 15 Sep	Spirit Airlines

Also check the deals for one-way flights from Dallas-Fort Worth 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 Dallas-Fort Worth to London in September from $599

Return flights