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

Return flights

04 May - 18 May	Turkish Airlines
15 May - 23 May	WestJet
06 May - 16 May	Cathay Pacific
16 May - 24 May	Turkish Airlines
10 May - 31 May	Turkish Airlines
01 May - 20 Jun	Hainan Airlines
30 May - 07 Jun	Air Canada
19 May - 11 Jun	jetBlue
30 May - 27 Jun	Air Canada
18 May - 25 May	jetBlue
06 May - 20 May	Lufthansa
04 May - 18 May	Delta	direct
06 May - 20 May	Delta	direct
06 May - 16 May	Delta	direct
01 May - 20 Jun	Delta	direct
19 May - 11 Jun	Korean Air	direct
30 May - 07 Jun	Delta	direct
30 May - 27 Jun	Delta	direct

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

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 Seoul in May from $895

Return flights