Seoul Incheon (ICN): free WiFi, excellent lounges.
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Yes. Free WiFi is unlimited across the airport.
Lounge quality here is excellent. A day pass, often purchasable without status or a premium ticket, can be well worth it for a longer layover.
Free shower and rest facilities, a spa, an ice rink, and even a small museum — consistently ranked among the world's best airports.
Yes — Seoul Incheon (ICN) is one of the better airports in the world to have a long layover in, with plenty to see and do.