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

Return flights

04 May - 30 May	British Airways
05 May - 30 May	British Airways
06 May - 11 May	British Airways
01 May - 23 May	Iberia
02 May - 24 May	British Airways
09 May - 20 May	jetBlue
17 May - 28 May	jetBlue
12 May - 19 May	jetBlue
21 May - 28 May	British Airways
04 May - 31 May	British Airways
14 May - 06 Jun	jetBlue
15 May - 06 Jun	jetBlue
20 May - 01 Jun	jetBlue
20 May - 07 Jun	jetBlue
13 May - 01 Jun	jetBlue
31 May - 20 Jun	jetBlue
30 May - 20 Jun	jetBlue
27 May - 20 Jun	jetBlue
28 May - 20 Jun	jetBlue
24 May - 13 Jun	jetBlue

Also check the deals for one-way flights from Ontario to Barcelona 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 Barcelona in May from 824€

Return flights