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

Return flights

09 Mar - 19 Mar	KLM
05 Mar - 12 Mar	SWISS
09 Mar - 16 Mar	Delta
02 Mar - 09 Mar	Delta
03 Mar - 09 Mar	Delta
10 Mar - 18 Mar	Delta
25 Mar - 14 Apr	Delta
08 Mar - 17 Mar	Delta
07 Mar - 18 Mar	Delta
12 Mar - 25 Mar	Delta
01 Mar - 18 Mar	KLM
24 Mar - 06 Apr	Delta
17 Mar - 28 Apr	Delta
23 Mar - 06 Apr	Delta
24 Mar - 05 Apr	Delta
25 Mar - 09 Apr	Delta
29 Mar - 07 Apr	KLM
22 Mar - 06 Apr	KLM
24 Mar - 20 Apr	Delta
29 Mar - 05 Apr	KLM

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

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 March from $1167

Return flights