Every practical way to make this trip, cheapest and simplest first.
Take the Airport Railroad from the basement of your terminal as far as Gimpo Airport, then follow the signs across to GTX-A and ride out to KINTEX Station. Exit 2 brings you out at Exhibition Hall 1. KINTEX puts the whole trip at about 70 minutes.
about 70 min · about KRW 6,000 · The cheapest and most predictable run, and it skips the motorway traffic.
Take airport limousine bus 3300 and get off at Daehwa Station on Line 3, then walk the last stretch to the halls. Airport buses leave from the 1st floor at Terminal 1, with Gyeonggi-bound services grouped around exits 7 to 10 — ask at the bus ticket booth in arrivals for the exact stop on the day.
about 57 min, plus a 10 to 15 minute walk · about KRW 8,500 · One vehicle the whole way, with a luggage bay underneath.
Bus 5600 is the only service that sets down at Exhibition Hall 1 itself, so there is no walk at the far end. It runs only a handful of times a day, so check the live arrivals board on KINTEX's own transport page before you count on it, and have a backup in mind.
varies — only about six departures a day · check the fare at the airport bus booth · Worth taking only if a departure happens to line up with your landing.
Taxi ranks are outside arrivals at both terminals. Show the driver 킨텍스 or the address 경기도 고양시 일산서구 킨텍스로 217-60. Tolls are added on top of the meter, and the run is mostly motorway so it is quick outside the peaks.
about 45 min · about KRW 44,000 · Heavy stand materials, or a small team arriving together.
Airport buses at Incheon are usually paid for with a ticket bought at the kiosk in arrivals rather than by tapping a transport card, so allow a few minutes for that before you head out to the stop.
Incheon Airport (ICN) → KINTEX, Goyang/Ilsan →
Gimpo Airport (GMP) → KINTEX, Goyang/Ilsan →