AirHint found the following cheapest return flights from London (LCY) to Castries (SLU) in May 2026 (see full year).
Return flights
| 11 May - 25 May | Delta | ||
| 14 May - 18 May | Delta | ||
| 01 May - 11 May | Delta | ||
| 15 May - 18 May | Delta | ||
| 18 May - 25 May | Delta |
Also check the deals for one-way flights from London to Castries in May.
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