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

Return flights

11 Sep - 14 Sep	Spirit Airlines
02 Sep - 14 Sep	Spirit Airlines
01 Sep - 03 Sep	Air Canada
26 Sep - 29 Sep	Air Canada
24 Sep - 30 Sep	Air Canada
08 Sep - 24 Sep	Air Canada
09 Sep - 24 Sep	United
09 Sep - 02 Oct	United
08 Sep - 17 Sep	Air Canada
10 Sep - 18 Sep	Air Canada
02 Sep - 09 Sep	British Airways	direct
09 Sep - 02 Oct	American Airlines	direct
16 Sep - 07 Oct	United
20 Sep - 10 Oct	KLM
26 Sep - 03 Oct	British Airways	direct
28 Sep - 19 Oct	Air Canada
16 Sep - 07 Oct	Austrian Airlines	direct
28 Sep - 19 Oct	Austrian Airlines	direct

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 $518

Return flights