Please see the existing thread on the Courtyard Marriott Seoul for information about the hotel. Moderators: Please consider merging this into the primary thread.

The closest stop on the 6008 bus route is around the corner from the hotel, near Shinsegae Department Store. When you exit the bus there, turn around (facing away from Yeongdeunpo station), walk 1/2 block back, turn left, walk 1/2 block to the main entrance for the Courtyard. Inside the doors are elevators that take you to the 5th floor hotel lobby, where you will find the registration desk. Total walking distance is maybe 200m.

Note that unlike most buses, the 6008 bus follows a route shaped like a lollipop. It travels out from the airport, making stops along the way. Then it loops around a few stops near Yeongdeungpo. Then it returns to the airport, revisiting most of the original stops along the way, including Gimpo Airport. The ride from ICN to Shinsegae takes about 75 minutes. But the ride back to ICN takes almost 90 minutes because of the loop.

If you are concerned about time and have several people in your group, you might find it more cost effective to hire a taxi. Normal taxi fare including tolls should be about 50,000 Won.