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

Return flights

13 May - 26 May	Korean Air
06 May - 18 May	Korean Air
05 May - 28 May	Korean Air
12 May - 26 May	Korean Air
05 May - 26 May	Korean Air
01 May - 31 May	Korean Air
04 May - 13 May	Korean Air
13 May - 20 May	Korean Air
01 May - 04 May	Korean Air
11 May - 29 May	Delta
20 May - 15 Jun	China Airlines
22 May - 20 Jun	Delta
22 May - 05 Jun	China Airlines
23 May - 06 Jun	China Airlines
27 May - 24 Jun	China Airlines
24 May - 03 Jun	China Airlines
23 May - 07 Jun	China Airlines

Also check the deals for one-way flights from Ontario to Bangkok 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 Bangkok in May from $575

Return flights