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

Return flights

09 Dec - 16 Dec	Delta
10 Dec - 16 Dec	Delta
10 Dec - 15 Dec	Delta
09 Dec - 15 Dec	Delta
11 Dec - 16 Dec	Delta
12 Dec - 16 Dec	Delta
04 Dec - 09 Dec	Delta
09 Dec - 14 Dec	Air France
10 Dec - 14 Dec	KLM
04 Dec - 08 Dec	Delta
22 Dec - 03 Jan	Virgin Atlantic
10 Dec - 03 Jan	United
24 Dec - 03 Jan	Allegiant Air
27 Dec - 02 Jan	Delta

Also check the deals for one-way flights from Louisville 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 Louisville to London in December from 510€

Return flights