AirHint found the following cheapest return flights from Ontario (ONT) to Buenos Aires (EZE) in May 2026 (see full year).
Return flights
| 14 May - 28 May | Avianca | ||
| 28 May - 04 Jun | Avianca | ||
| 16 May - 21 May | Avianca | ||
| 20 May - 03 Jun | Copa | ||
| 24 May - 03 Jun | Volaris | ||
| 01 May - 19 May | LATAM Airlines Group | ||
| 16 May - 29 May | LATAM Airlines Group |
Also check the deals for one-way flights from Ontario to Buenos Aires in May.
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