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

Return flights

22 Sep - 10 Oct	easyJet
25 Sep - 10 Oct	easyJet
29 Sep - 10 Oct	easyJet
20 Sep - 30 Sep	easyJet
20 Sep - 10 Oct	easyJet
23 Sep - 10 Oct	easyJet
24 Sep - 10 Oct	easyJet
28 Sep - 10 Oct	easyJet
14 Sep - 19 Sep	easyJet
26 Sep - 10 Oct	Ryanair
27 Sep - 10 Oct	easyJet
04 Sep - 07 Sep	easyJet
21 Sep - 10 Oct	British Airways

Also check the deals for one-way flights from Belfast to Bucharest 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 Belfast to Bucharest in September from 140€

Return flights