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

Return flights

13 May - 24 May	Arajet
02 May - 09 May	United
10 May - 17 May	WestJet
26 May - 02 Jun	United
20 May - 27 May	United
03 May - 06 Jun	United
04 May - 11 May	United
19 May - 02 Jun	United
09 May - 16 May	United
08 May - 15 May	Arajet
06 May - 13 May	United
13 May - 20 May	Arajet
26 May - 16 Jun	United
05 May - 12 May	WestJet
27 May - 03 Jun	WestJet
20 May - 03 Jun	WestJet
30 May - 06 Jun	United
29 May - 05 Jun	WestJet
28 May - 04 Jun	WestJet
27 May - 17 Jun	WestJet

Also check the deals for one-way flights from Montreal to San Juan in May.

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 May from $287

Return flights