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

Return flights

03 May - 25 May	Etihad Airways
08 May - 16 May	Etihad Airways
17 May - 30 May	WestJet
26 May - 13 Jun	Cathay Pacific
29 May - 26 Jun	Turkish Airlines
25 May - 14 Jun	Turkish Airlines
06 May - 20 May	Lufthansa
24 May - 14 Jun	Cathay Pacific
06 May - 20 May	Delta	direct
08 May - 16 May	Delta	direct
15 May - 06 Jun	Air Canada
26 May - 13 Jun	Korean Air	direct
25 May - 14 Jun	Korean Air	direct
15 May - 06 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 941€

Return flights