AirHint found the following cheapest return flights from Hamilton (YHM) to London (LHR) in September 2025 (see full year).

Return flights

25 Sep - 02 Oct	WestJet
29 Sep - 09 Oct	WestJet
23 Sep - 07 Oct	WestJet
28 Sep - 15 Oct	WestJet
29 Sep - 06 Oct	WestJet
30 Sep - 09 Oct	WestJet
14 Sep - 12 Oct	WestJet
29 Sep - 10 Oct	WestJet
05 Sep - 15 Sep	Porter Airlines (Canada) Ltd
04 Sep - 15 Sep	WestJet
15 Sep - 24 Sep	WestJet
18 Sep - 25 Sep	WestJet
04 Sep - 18 Sep	WestJet
14 Sep - 21 Sep	WestJet
15 Sep - 21 Sep	WestJet
18 Sep - 26 Sep	WestJet
19 Sep - 24 Sep	WestJet
04 Sep - 12 Sep	WestJet
24 Sep - 07 Oct	WestJet
24 Sep - 03 Oct	WestJet

Also check the deals for one-way flights from Hamilton to London 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 Hamilton to London in September from 826€

Return flights