Cheapest return flights from Chicago to Castries in March from $749

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

Return flights

05 Mar - 09 Mar Frontier Airlines
26 Mar - 02 Apr Frontier Airlines
09 Mar - 16 Mar Porter Airlines (Canada) Ltd
07 Mar - 16 Mar Porter Airlines (Canada) Ltd
11 Mar - 16 Mar Frontier Airlines
06 Mar - 16 Mar WestJet

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

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