AirHint found the following cheapest return flights from Ottawa (YOW) to Amsterdam (AMS) in September 2025 (see full year).

Return flights

07 Sep - 14 Sep	Air Transat
03 Sep - 14 Sep	Air Transat
06 Sep - 14 Sep	Air Transat
05 Sep - 14 Sep	WestJet
04 Sep - 14 Sep	Porter Airlines (Canada) Ltd
02 Sep - 14 Sep	Porter Airlines (Canada) Ltd
01 Sep - 14 Sep	Porter Airlines (Canada) Ltd
26 Sep - 02 Oct	Air France
10 Sep - 20 Sep	WestJet

Also check the deals for one-way flights from Ottawa to Amsterdam in September.

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 Ottawa to Amsterdam in September from 527€

Return flights