AirHint found the following cheapest return flights from Philadelphia (PHL) to Seoul (ICN) in January 2026 (see full year).
Return flights
| 21 Jan - 01 Feb | Spirit Airlines | ||
| 17 Jan - 24 Jan | United | ||
| 01 Jan - 23 Jan | Korean Air | ||
| 01 Jan - 11 Jan | Korean Air |
Also check the deals for one-way flights from Philadelphia to Seoul in January.
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