AirHint found the following cheapest return flights from Montreal (YUL) to Willemstad (CUR) in September 2025 (see full year).

Return flights

06 Sep - 13 Sep	United
27 Sep - 04 Oct	United
13 Sep - 20 Sep	United
17 Sep - 24 Sep	Avianca
15 Sep - 24 Sep	Avianca
15 Sep - 22 Sep	Avianca
29 Sep - 08 Oct	Avianca
24 Sep - 08 Oct	Avianca
10 Sep - 17 Sep	Avianca
22 Sep - 29 Sep	Avianca
29 Sep - 06 Oct	Avianca
26 Sep - 03 Oct	Avianca
08 Sep - 15 Sep	Avianca
19 Sep - 26 Sep	Avianca
03 Sep - 10 Sep	Avianca
28 Sep - 05 Oct	Avianca
24 Sep - 01 Oct	Avianca
23 Sep - 07 Oct	WestJet
25 Sep - 02 Oct	WestJet
30 Sep - 07 Oct	Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Montreal to Willemstad 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 Montreal to Willemstad in September from 236€

Return flights