AirHint found the following cheapest return flights from London (LCY) to Castries (SLU) in January 2026 (see full year).

Return flights

19 Jan - 29 Jan	Delta
26 Jan - 05 Feb	Delta
27 Jan - 03 Feb	Delta
13 Jan - 22 Jan	Delta
12 Jan - 02 Feb	Delta
28 Jan - 02 Feb	Delta
12 Jan - 26 Jan	Delta
18 Jan - 01 Feb	Delta
13 Jan - 27 Jan	Delta
08 Jan - 15 Jan	Delta
14 Jan - 21 Jan	Delta
09 Jan - 18 Jan	Delta
30 Jan - 03 Feb	Delta
30 Jan - 08 Feb	Delta
05 Jan - 13 Jan	Delta
09 Jan - 19 Jan	Delta
06 Jan - 13 Jan	Delta
06 Jan - 03 Feb	Delta

Also check the deals for one-way flights from London to Castries in January.

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 January from $1133

Return flights