AirHint found the following cheapest return flights from Montreal (YUL) to San Juan (SJU) in September 2026 (see full year).

Return flights

08 Sep - 15 Sep	WestJet
09 Sep - 16 Sep	WestJet
11 Sep - 18 Sep	WestJet
12 Sep - 19 Sep	WestJet
15 Sep - 22 Sep	WestJet
16 Sep - 23 Sep	WestJet
17 Sep - 24 Sep	WestJet
18 Sep - 25 Sep	WestJet
19 Sep - 26 Sep	WestJet
22 Sep - 29 Sep	WestJet
26 Sep - 03 Oct	WestJet
30 Sep - 07 Oct	WestJet
28 Sep - 05 Oct	WestJet

Also check the deals for one-way flights from Montreal to San Juan 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 San Juan in September from 491€

Return flights