AirHint found the following cheapest return flights from London (LCY) to Castries (SLU) in December 2025 (see full year).

Return flights

30 Dec - 20 Jan	Delta
02 Dec - 09 Dec	Delta
27 Dec - 07 Jan	Delta
24 Dec - 07 Jan	Delta
16 Dec - 13 Jan	Delta
10 Dec - 25 Dec	Delta
10 Dec - 07 Jan	Delta
01 Dec - 08 Dec	Delta
30 Dec - 11 Jan	Delta
29 Dec - 11 Jan	Delta
28 Dec - 08 Jan	Delta
29 Dec - 05 Jan	Delta
08 Dec - 17 Dec	Delta
02 Dec - 15 Dec	Delta
06 Dec - 28 Dec	Delta
10 Dec - 30 Dec	Delta
20 Dec - 13 Jan	Delta
04 Dec - 18 Dec	Delta
10 Dec - 28 Dec	Delta
23 Dec - 31 Dec	Delta

Also check the deals for one-way flights from London to Castries 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 London to Castries in December from $2012

Return flights