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

Return flights

28 Sep - 14 Oct	Delta
30 Sep - 07 Oct	British Airways	direct
28 Sep - 14 Oct	British Airways	direct
25 Sep - 02 Oct	KLM
25 Sep - 30 Sep	KLM
25 Sep - 01 Oct	KLM
29 Sep - 12 Oct	British Airways	direct
25 Sep - 10 Oct	KLM
30 Sep - 25 Oct	Virgin Atlantic
26 Sep - 30 Sep	Lufthansa
26 Sep - 04 Oct	KLM
25 Sep - 04 Oct	American Airlines
23 Sep - 30 Sep	Spirit Airlines
25 Sep - 30 Sep	British Airways	direct
26 Sep - 30 Sep	British Airways	direct
24 Sep - 30 Sep	Spirit Airlines
26 Sep - 28 Sep	British Airways
20 Sep - 29 Sep	jetBlue
25 Sep - 28 Sep	Delta
22 Sep - 26 Sep	Spirit Airlines

Also check the deals for one-way flights from Houston 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 Houston to London in September from $504

Return flights