I purchased a ticket from Seattle to Tokyo with a 3 hour layover in Incheon airport in Seoul, South Korea. After purchase the airline canceled the ICN-HND flight and replaced it in my itinerary with a Gimpo to Haneda flight; however, the new flight leaves only 1 hour 50 minutes after the first is scheduled to land. Transferring via a separate airport will require not only the transit time between airports, but going through immigration and customs at ICN, and checkin and security at GMP. Is 2 hours enough time for that process?
Transfer from Incheon airport to Gimpo and vice versa covers the mechanics of transferring between the airports but not the minimum time to do so.