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

Return flights

11 Sep - 17 Sep	Copa
04 Sep - 10 Sep	Copa
13 Sep - 19 Sep	Copa
09 Sep - 05 Oct	Copa
05 Sep - 12 Sep	Porter Airlines (Canada) Ltd
13 Sep - 20 Sep	Copa
05 Sep - 10 Sep	Porter Airlines (Canada) Ltd
27 Sep - 04 Oct	WestJet
28 Sep - 05 Oct	Air Transat
21 Sep - 28 Sep	Air Transat
09 Sep - 15 Sep	Copa
14 Sep - 21 Sep	Delta
20 Sep - 27 Sep	WestJet
29 Sep - 06 Oct	Avianca
26 Sep - 03 Oct	Avianca
30 Sep - 26 Oct	Porter Airlines (Canada) Ltd
24 Sep - 01 Oct	Avianca
24 Sep - 15 Oct	Avianca
17 Sep - 01 Oct	Avianca

Also check the deals for one-way flights from Montreal to Philipsburg 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 Philipsburg in September from 240€

Return flights