Cheapest return flights from Seattle to Bucharest in September from $683

Best time to book flights for Seattle (SEA) to Bucharest (OTP) flights at AirHint

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

Return flights

03 Sep - 10 Sep Lufthansa
24 Sep - 01 Oct Icelandair
02 Sep - 09 Sep British Airways
16 Sep - 23 Sep Aer Lingus
04 Sep - 11 Sep Icelandair
17 Sep - 24 Sep Icelandair
19 Sep - 26 Sep Icelandair
11 Sep - 18 Sep Lufthansa
01 Sep - 08 Sep British Airways
08 Sep - 15 Sep Icelandair
07 Sep - 14 Sep Lufthansa

Also check the deals for one-way flights from Seattle to Bucharest in September.

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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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