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

Return flights

03 Dec - 10 Dec	British Airways
09 Dec - 16 Dec	British Airways
06 Dec - 13 Dec	British Airways
15 Dec - 22 Dec	British Airways
16 Dec - 29 Dec	United
30 Dec - 06 Jan	British Airways
25 Dec - 01 Jan	British Airways
11 Dec - 04 Jan	Delta
12 Dec - 04 Jan	Delta
12 Dec - 19 Dec	British Airways
20 Dec - 27 Dec	British Airways
19 Dec - 26 Dec	British Airways
19 Dec - 30 Dec	British Airways
19 Dec - 20 Dec	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 452€

Return flights