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Take the train. The AREX will whisk you from Incheon Airport straight to Gimpo Airport in 35 minutes for just 3,550 won (~US$3), with trains every 10 minutes or so. Note that you'll need to take the regular (commuter) service, the express goes straight to Seoul Station. There are also bus services, which can be marginally faster if traffic is in your ...
You can take the metro from Incheon to Gimpo. The line is named AREX It takes 34 min and costs 3550 ₩ (~3 € / $). Itinerary on smrt.co.kr
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