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

Return flights

09 Mar - 16 Mar	Delta
09 Mar - 23 Mar	Delta
18 Mar - 25 Mar	Delta
23 Mar - 31 Mar	Delta
19 Mar - 26 Mar	Delta
17 Mar - 31 Mar	Delta
04 Mar - 18 Mar	Delta
08 Mar - 18 Mar	Delta
23 Mar - 06 Apr	Delta
22 Mar - 01 Apr	Delta
22 Mar - 29 Mar	KLM
02 Mar - 05 Mar	Delta
31 Mar - 13 Apr	Delta
30 Mar - 09 Apr	Delta
27 Mar - 15 Apr	Delta
29 Mar - 09 Apr	Delta

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 $1088

Return flights