Cheapest return flights from Ontario to St. Thomas in May from $776

AirHint found the following cheapest return flights from Ontario (ONT) to St. Thomas (STT) in May 2026 (see full year).

Return flights

14 May - 18 May Alaska Airlines
18 May - 23 May Southwest Airlines
22 May - 26 May Alaska Airlines
21 May - 26 May Alaska Airlines

Also check the deals for one-way flights from Ontario to St. Thomas in May.

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