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

Return flights

02 Dec - 09 Dec	British Airways
03 Dec - 10 Dec	British Airways
07 Dec - 14 Dec	British Airways
02 Dec - 13 Dec	British Airways
08 Dec - 15 Dec	British Airways
12 Dec - 19 Dec	United
10 Dec - 08 Jan	British Airways
17 Dec - 24 Dec	British Airways
13 Dec - 20 Dec	United
16 Dec - 29 Dec	Delta
18 Dec - 25 Dec	British Airways
29 Dec - 04 Jan	Virgin Atlantic
28 Dec - 04 Jan	United
27 Dec - 03 Jan	United
29 Dec - 01 Jan	Spirit Airlines
29 Dec - 03 Jan	Condor
29 Dec - 02 Jan	Virgin Atlantic
30 Dec - 02 Jan	Virgin Atlantic

Also check the deals for one-way flights from San Antonio 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 San Antonio to London in December from 455€

Return flights