Cheapest return BOS–ICN flights, September

AirHint found the following cheapest return flights from Boston (BOS) to Seoul (ICN) in September 2026 (see full year).

Return flights

09 Sep - 06 Oct WestJet
10 Sep - 06 Oct WestJet
01 Sep - 16 Sep Cathay Pacific
17 Sep - 30 Sep Cathay Pacific
04 Sep - 20 Sep WestJet
15 Sep - 22 Sep WestJet
27 Sep - 13 Oct WestJet
24 Sep - 04 Oct Air Canada
03 Sep - 13 Sep Air Canada
01 Sep - 16 Sep Delta direct
15 Sep - 22 Sep Delta direct
17 Sep - 30 Sep Delta direct
15 Sep - 30 Sep Delta direct
09 Sep - 06 Oct Delta direct
10 Sep - 06 Oct Delta direct
03 Sep - 13 Sep Delta direct
24 Sep - 04 Oct Delta direct

Also check the deals for one-way flights from Boston to Seoul 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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