AirHint found the following cheapest return flights from London (LTN) to Belfast (BFS) in September 2025 (see full year).

Return flights

01 Sep - 04 Sep	easyJet	direct
13 Sep - 15 Sep	easyJet	direct
13 Sep - 14 Sep	easyJet	direct
19 Sep - 21 Sep	easyJet	direct
29 Sep - 04 Oct	easyJet	direct
02 Sep - 04 Sep	easyJet	direct
12 Sep - 14 Sep	easyJet	direct
18 Sep - 21 Sep	easyJet	direct
26 Sep - 29 Sep	easyJet	direct
23 Sep - 29 Sep	easyJet	direct
22 Sep - 28 Sep	easyJet	direct
13 Sep - 27 Oct	easyJet

Also check the deals for one-way flights from London to Belfast 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 London to Belfast in September from $61

Return flights