One nice thing about living in Pyeongtaek is that we live closer to Seoul. It makes for a nice day trip. But the airport is actually in Incheon, not Seoul, which is at least a 2 hour drive.
On our vacation to Okinawa, we decided to try the airport limousine bus instead of messing with traffic, tolls, and airport parking. It was very easy.
We called a taxi to pick us up at about 730 and then waited at the bus stop. It is the same bus stop as the 20 bus by the main gate (in front of the Volvo dealer /Christine Realty).
The purple bus was right on time, 7:55 AM. The driver got off the bus to help us store our luggage. He asked if we were going all the way to Incheon because the bus makes several stops.
The cost is very reasonable. Adults pay 13,300 won (a little less than $13) and children pay 6,700 won so our family of 3 paid a little less than $30 to get from base to the airport which I think is great for a 2.5 hour trip. You can either pay with won (exact change) or your tmoney (subway) card.
The bus was a comfortable temperature. The seats recline. Each seat has a vent and a light. There is even space overhead to put your coat and bookbag.
On the way back, you actually buy a ticket. Once you clear customs in Incheon go straight and there is a sign that says airport limousine bus. There is even a desk for foreigners.
There are two options for your trip home. You can either take Anjeong-ri outside the main gate, or you can go to Pyeongtaek Station. The bus for Pyeongtaek Station comes more often and is the same price, 13,300 won for adults and 6,700 for children.
We chose to go to Pyeongtaek Station because the next bus was in about 50 minutes instead of the 2.5 hours we would need to wait for the bus to Anjeong-ri.
The bus from Incheon to Pyeongtaek took about 2 hours (1.5 if you are going to Songtan). The bus station was closed for the night when we arrived. After leaving the bus station, turn left (towards Daiso). In a couple of blocks you will arrive at AK Plaza /Pyeongtaek train station where there is always a line of taxis waiting.
The taxi from AK Plaza to somewhere near the Anjeong-ri gate of Camp Humphreys should cost about 10,000 won ($10).
Both busses were easy to use and comfortable. I think next time, we will see which bus fits our schedule better to decide if we will leave from Anjeong-ri or Pyeongtaek bus terminal.