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

Return flights

02 Dec - 09 Dec	Finnair	direct
06 Dec - 13 Dec	Air Canada
23 Dec - 02 Jan	TAP
27 Dec - 04 Jan	Finnair	direct
22 Dec - 01 Jan	Air France
18 Dec - 31 Dec	Air Canada
18 Dec - 31 Dec	British Airways	direct
22 Dec - 01 Jan	British Airways	direct
23 Dec - 02 Jan	British Airways	direct

Also check the deals for one-way flights from Montreal to London in December.

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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Montreal to London in December from 585€

Return flights