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

Return flights

07 May - 18 May	Air Transat
05 May - 18 May	Air Transat
06 May - 13 May	Air Transat
04 May - 18 May	Air Transat
04 May - 13 May	Air Transat
12 May - 19 May	Air Transat
05 May - 12 May	Air Transat
04 May - 11 May	Air Transat
18 May - 01 Jun	Air Transat
23 May - 08 Jun	Air Transat
13 May - 20 May	Air Transat
23 May - 30 May	Air Transat
22 May - 05 Jun	Air Transat
26 May - 14 Jun	Air Transat
21 May - 04 Jun	Air Transat
19 May - 02 Jun	Air Transat
25 May - 01 Jun	Air Transat
25 May - 08 Jun	Air Transat
31 May - 09 Jun	WestJet
20 May - 03 Jun	Air Transat

Also check the deals for one-way flights from Montreal to London 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 London in May from $601

Return flights