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

Return flights

01 May - 11 May	Korean Air
06 May - 27 May	Korean Air
12 May - 19 May	Korean Air
05 May - 12 May	Korean Air
11 May - 18 May	Korean Air
13 May - 20 May	Korean Air
05 May - 19 May	Korean Air
06 May - 20 May	Korean Air
13 May - 27 May	Korean Air
13 May - 19 May	Korean Air
19 May - 09 Jun	Korean Air
18 May - 17 Jun	China Airlines
31 May - 11 Jun	China Airlines

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

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 Ontario to Singapore in May from $711

Return flights