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

Return flights

30 Sep - 14 Oct	Scandinavian Airlines
26 Sep - 04 Oct	Scandinavian Airlines
10 Sep - 15 Oct	Virgin Atlantic
04 Sep - 09 Sep	Scandinavian Airlines
09 Sep - 23 Sep	Delta
29 Sep - 15 Oct	Delta
09 Sep - 16 Sep	Air France
10 Sep - 24 Sep	Air France
08 Sep - 23 Sep	Air France
07 Sep - 23 Sep	Delta
30 Sep - 07 Oct	Delta
29 Sep - 10 Oct	KLM
24 Sep - 08 Oct	KLM
05 Sep - 10 Sep	Virgin Atlantic
14 Sep - 12 Oct	Air France
25 Sep - 02 Oct	Air France
09 Sep - 04 Oct	Delta
19 Sep - 23 Sep	Delta
09 Sep - 14 Sep	Air France
12 Sep - 19 Sep	Air France

Also check the deals for one-way flights from Dallas 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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Dallas to London in September from 613€

Return flights