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

Return flights

31 Dec - 09 Jan	United
31 Dec - 11 Jan	Austrian Airlines
31 Dec - 17 Jan	British Airways	direct
31 Dec - 11 Jan	United	direct
28 Dec - 08 Jan	Austrian Airlines
26 Dec - 10 Jan	jetBlue
30 Dec - 25 Jan	Lufthansa
29 Dec - 10 Jan	Lufthansa	direct
30 Dec - 25 Jan	British Airways	direct
27 Dec - 16 Jan	Frontier Airlines
26 Dec - 30 Dec	Spirit Airlines
26 Dec - 28 Dec	Air France
26 Dec - 30 Dec	Austrian Airlines	direct
26 Dec - 28 Dec	Austrian Airlines	direct
26 Dec - 27 Dec	Aer Lingus
26 Dec - 27 Dec	British Airways	direct

Also check the deals for one-way flights from Houston to London in December.

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 December from $707

Return flights