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

Return flights

11 May - 15 May	Turkish Airlines
12 May - 19 May	Cathay Pacific
26 May - 09 Jun	WestJet
12 May - 26 May	Etihad Airways
28 May - 18 Jun	WestJet
18 May - 25 May	Alaska Airlines
27 May - 03 Jun	Alaska Airlines
26 May - 02 Jun	Alaska Airlines
12 May - 19 May	Korean Air	direct
12 May - 26 May	Delta	direct
06 May - 16 May	Delta	direct
18 May - 25 May	Delta	direct
26 May - 09 Jun	Delta	direct
26 May - 02 Jun	Delta	direct
28 May - 18 Jun	Delta	direct
27 May - 03 Jun	Delta	direct
11 May - 15 May	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 834€

Return flights