AirHint found the following cheapest return flights from Boston (BOS) to Bucharest (OTP) in September 2025 (see full year).

Return flights

02 Sep - 29 Sep	Air Canada
02 Sep - 12 Sep	Air Canada
09 Sep - 23 Sep	Air Canada
02 Sep - 16 Sep	SWISS
08 Sep - 16 Sep	SWISS
02 Sep - 09 Sep	Air Canada
09 Sep - 16 Sep	Air Canada
02 Sep - 18 Sep	Air Canada
01 Sep - 08 Sep	Air Canada
10 Sep - 17 Sep	Air Canada
24 Sep - 15 Oct	Air Canada
23 Sep - 15 Oct	Air Canada
17 Sep - 14 Oct	Air Canada
24 Sep - 21 Oct	Air Canada
23 Sep - 07 Oct	SWISS
17 Sep - 01 Oct	Air Canada
24 Sep - 08 Oct	Air Canada
30 Sep - 14 Oct	Air Canada
24 Sep - 14 Oct	Air Canada
24 Sep - 01 Oct	SWISS

Also check the deals for one-way flights from Boston 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 Boston to Bucharest in September from $377

Return flights