AirHint found the following cheapest return flights from Boston (BOS) to Seoul (ICN) in May 2026 (see full year).
Return flights
| 05 May - 15 May | Turkish Airlines | ||
| 06 May - 16 May | Turkish Airlines | ||
| 06 May - 20 May | Lufthansa | ||
| 06 May - 16 May | Korean Air | direct | |
| 05 May - 15 May | Korean Air | direct | |
| 06 May - 20 May | Delta | direct |
Also check the deals for one-way flights from Boston to Seoul in May.
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