AirHint found the following cheapest return flights from Ontario (ONT) to Keflavik (KEF) in September 2026 (see full year).
Return flights
| 13 Sep - 20 Sep | KLM | ||
| 14 Sep - 21 Sep | KLM | ||
| 06 Sep - 13 Sep | Alaska Airlines | ||
| 07 Sep - 14 Sep | British Airways | ||
| 01 Sep - 11 Sep | British Airways | ||
| 06 Sep - 26 Sep | British Airways | ||
| 05 Sep - 12 Sep | Alaska Airlines |
Also check the deals for one-way flights from Ontario to Keflavik in September.
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