Cheapest one-way flights from Chicago to Castries in April from $215

AirHint found the following cheapest one-way flights from Chicago (MDW) to Castries (SLU) in April 2026 (see full year).

One-Way flights

20 Apr Porter Airlines (Canada) Ltd
21 Apr Frontier Airlines
22 Apr Porter Airlines (Canada) Ltd
25 Apr Frontier Airlines
23 Apr Frontier Airlines
17 Apr Frontier Airlines
18 Apr Frontier Airlines
24 Apr Frontier Airlines
19 Apr Frontier Airlines
16 Apr Delta

Also check the deals for return flights from Chicago to Castries in April.

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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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