Most people landing at Incheon International Airport already know the train exists. What they don’t know is which one to take, where to board it, or whether booking in advance actually makes a difference. I’ve made most of these mistakes myself — including buying my ticket on the official site only to find out later that third-party booking saves you ₩1,500 ($1 USD) per ticket and lets you pick your seat.
This guide covers the full picture: the difference between the two AREX services, how to use the Seoul Station city check-in that most guides barely mention, how to get between Gimpo and Incheon airports by train, and exactly where to board at each station. Updated June 2026.
Table of Contents
AREX Express vs All-Stop: Which One Do You Need?
AREX (Airport Railroad Express) runs two completely different services on the same line. They look similar on the map but serve different purposes entirely.
| Express Train | All-Stop Train | |
|---|---|---|
| Route | Seoul Station ↔ Incheon Airport (non-stop) | 14 stations including Gimpo Airport |
| Travel time | ~43 min (T1) / ~51 min (T2) | ~60–68 min |
| Fare | ₩13,000 (~$8.67 USD) | Varies by distance |
| Seats | Reserved (assigned) | Open seating |
| Booking | Required (recommended in advance) | None — tap and go |
| Best for | Heavy luggage, tight schedules, Seoul Station area | Budget travelers, Hongdae, Gimpo transfer |
Assuming the Express is always the right call is the most common mistake travelers make. If your hotel is near Hongdae (Hongik University Station) or you’re connecting via Gimpo Airport, the All-Stop train gets you there more directly and costs a fraction of the price.
That said, if you have heavy luggage, a fixed departure time, or want to use the Seoul Station city check-in service (more on that below), it is worth the extra cost.
AREX Express Train: What You Need to Know
Running non-stop between Seoul Station and Incheon Airport Terminal 1 (43 minutes) or Terminal 2 (51 minutes), the Express is the faster and more comfortable of the two options. Every seat is assigned, the carriages are clean and quiet, and there’s overhead luggage space — it genuinely feels like a short-haul flight without the security line.
Timetable (from Seoul Station to Incheon Airport T1):
Trains run roughly every 30–40 minutes. First departure is at 05:24, last at 22:48. The schedule is identical on weekdays and weekends.
| Weekday / Weekend | Departures |
|---|---|
| Morning | 05:24 / 06:08 / 06:38 / 07:13 / 08:18 / 09:06 / 09:38 |
| Afternoon | 10:18 / 10:58 / 11:38 / 12:18 / 12:53 / 13:28 / 14:08 / 14:48 |
| Evening | 15:28 / 16:08 / 16:48 / 17:28 / 18:18 / 18:43 / 19:23 / 20:13 / 21:03 / 21:58 / 22:48 |
Fares:
| Passenger | Fare |
|---|---|
| Adult (13+) | ₩13,000 (~$8.67 USD) |
| Child (6–12) | ₩9,500 (~$6.33 USD) |
| Senior / Disabled / National merit | ₩9,500 (~$6.33 USD) |
Walk-up tickets are available at the orange vending machines and staffed counters at Seoul Station B2. Note that the ticket machines sometimes decline non-Korean cards — if that happens, the staffed counter accepts foreign cards without issue.
Where to Book — and Why the Price Differs
I booked my first AREX ticket directly through the official AREX website. It worked fine. Then I found out that booking through an affiliated partner brings the adult fare down from ₩13,000 to ₩11,500 (~$7.67 USD) — that’s a ₩1,500 saving per ticket, per direction. For two people on a round trip, that’s ₩6,000 back in your pocket without any trade-off in service or convenience.
Booking through a partner also lets you choose your specific seat rather than being assigned one — useful if you’re traveling with someone and want to sit together, or if you prefer a window.
→ Book the AREX Express Train at the discounted rate here
Walk-up purchase is always an option, but seats do sell out on busy travel days. If you have a specific train in mind, booking ahead takes the guesswork out of it.
Seoul Station City Check-In: The Benefit Most Travelers Miss
Almost no travel guide covers this properly — and it’s one of the most genuinely useful features of the Express.
If you’re departing from Incheon Airport and taking this train from Seoul Station, you can check in your bags and go through immigration before you board the train — right there at Seoul Station B2. That means you arrive at the airport with nothing to carry and walk straight to your gate.
How it works:
- Purchase your Express ticket first (required to enter the check-in area)
- Proceed to the airline check-in counter at Seoul Station B2
- Drop your bags and go through immigration
- Board the Express at B7 (the platform)
- Arrive at Incheon Airport and head directly to your departure gate
Key details to know:
- Available for select airlines only — check with your carrier before counting on it
- Cut-off time: 3 hours before departure for T1 flights, 3 hours 20 minutes for T2
- The counters open at 05:20 AM — useful if you have an early flight and need to check out of your hotel beforehand
I’ve used this once and the difference is noticeable. Getting on the train with just a carry-on after dropping bags at Seoul Station feels significantly less stressful than managing luggage through the airport.
Getting from Gimpo Airport to Incheon Airport by Train
A less commonly discussed use case: traveling between the two airports. I had to do this for an inter-airport transfer — international flight into Incheon, domestic connection out of Gimpo — and the AREX All-Stop train handles it cleanly without any transfers.
Important: The Express train does not stop at Gimpo Airport. It passes through without stopping. For this route, the All-Stop is the only option.
| Route | Fare | Travel Time |
|---|---|---|
| Gimpo Airport ↔ Incheon Airport T1 | ₩4,350 (~$2.90 USD) | ~37 min |
| Gimpo Airport ↔ Incheon Airport T2 | ₩4,950 (~$3.30 USD) | ~44 min |
No booking needed. Use your T-money card or purchase a single-use ticket at the machine. It runs frequently — every 5 to 12 minutes during daytime hours — so you won’t be waiting long.
Gimpo Airport Station also connects to Seoul Metro Lines 5 and 9, which means it’s a useful transit hub for travelers coming from various parts of Seoul who want to reach Incheon without going all the way to Seoul Station first.
Where to Board at Each Station
Getting on the wrong train because you went to the wrong gate is a more common problem than it sounds. Here’s exactly where to go at each of the three main stations.
Seoul Station
Confusion happens here more often than anywhere else. The Express and All-Stop trains use different floors at Seoul Station:
- B2: Express train ticket counters, vending machines, and boarding gate. Also where the city check-in is located.
- B3: All-Stop train boarding. Also connects to Subway Lines 1 and 4.
- B7: The shared platform for both services. But you must enter through the correct gate on B2 or B3.
Look for orange signage for the Express, blue for the All-Stop. They’re clearly color-coded throughout the station, but if you go to the wrong basement floor first, you’ll waste time backtracking with luggage.
Gimpo Airport
Straightforward. Head to B1 (the subway level) and follow the AREX signs — they’re clearly posted. The All-Stop train is the only AREX service here. Check the direction board before boarding: you want the Incheon Airport-bound service, not the Seoul Station-bound one.
Incheon Airport (T1 and T2)
Both terminals: go to B1, Transportation Center. The Express gate is marked in orange, the All-Stop in blue. I was worried about finding it in a large airport the first time — it turned out to be easier than expected. The signage is prominent from the arrivals level and the color-coding makes it immediately clear which gate is which.
If You Have an Early or Late Flight
One thing worth planning for if you’re on a very early morning or late-night flight: the first AREX Express from Seoul Station departs at 05:24, and the last one at 22:48. If your flight falls outside that window, you’ll need an alternative — either a taxi or a night bus.
For travelers in that situation, staying overnight at the airport itself is a practical option that more people overlook than you’d expect. There’s a capsule hotel inside Incheon Airport that’s significantly cheaper than most city hotels and saves you a late-night or pre-dawn transit entirely.
→ Incheon Airport capsule hotel — rates and availability
It’s worth considering especially if you have a connecting flight with a long layover, or if your outbound flight is early enough that taking the first AREX Express would mean a 4 AM wake-up.
Quick Reference Summary
| Need | Best Option |
|---|---|
| Seoul Station → Incheon Airport, fast | AREX Express (book in advance for discount + seat choice) |
| Budget / Hongdae area | AREX All-Stop (T-money card, no booking) |
| Gimpo Airport → Incheon Airport | AREX All-Stop only (Express doesn’t stop at Gimpo) |
| Check bags before boarding | Seoul Station City Check-In (Express passengers only) |
| Early / late flight, no train available | Incheon Airport capsule hotel |
The Incheon Airport train system is genuinely well-designed once you know the difference between the two services and where to find them. The main thing is getting those two details right before you arrive — which is exactly what this guide is for.
Do I need to book the AREX Express train in advance?
Walk-up tickets are available at Seoul Station and Incheon Airport on the day of travel, but seats can sell out on busy travel days. Booking in advance through an affiliated partner also saves you ₩1,500 per ticket (~$1 USD) compared to the official rate, and lets you choose your specific seat. If you have a fixed departure time or are traveling with someone you want to sit next to, booking ahead makes sense.
What is the difference between the AREX Express and All-Stop train?
The Express runs non-stop between Seoul Station and Incheon Airport in about 43 minutes (Terminal 1) or 51 minutes (Terminal 2). It has reserved seating and costs ₩13,000 (~$8.67 USD) per adult. The All-Stop train takes 60–68 minutes, stops at 14 stations including Gimpo Airport and Hongdae (Hongik University), uses open seating, and is priced like a regular subway based on distance. No booking is required for the All-Stop — just tap a T-money card or buy a single-use ticket.
Can I take the AREX Express from Gimpo Airport?
No. The Express train passes through Gimpo Airport Station without stopping. If you need to travel between Gimpo and Incheon airports, you must use the All-Stop train. The fare is ₩4,350 (~$2.90 USD) to Terminal 1 and ₩4,950 (~$3.30 USD) to Terminal 2, with a travel time of 37–44 minutes depending on the terminal.
What is the Seoul Station City Airport Terminal and who can use it?
The City Airport Terminal at Seoul Station B2 allows AREX Express passengers to check in their luggage and go through immigration before boarding the train — so you arrive at Incheon Airport with nothing to carry and can head straight to your gate. It’s available for select airlines only, so check with your carrier first. The cut-off is 3 hours before departure for Terminal 1 flights and 3 hours 20 minutes for Terminal 2 flights. The counters open at 05:20 AM.
Where exactly do I board the AREX at Seoul Station?
Seoul Station has two separate entry points depending on which service you’re using. The Express train is on B2 — look for the orange signs and the ticket vending machines or staffed counters. The All-Stop train boards from B3, which also connects to Subway Lines 1 and 4. Both trains share the platform at B7, but you must enter through the correct gate on the correct floor. Going to the wrong floor with heavy luggage is the most common mistake at Seoul Station.
Is it cheaper to buy the AREX ticket online or at the station?
At the station (walk-up), the adult Express fare is ₩13,000 (~$8.67 USD). Through affiliated booking partners, the same ticket costs ₩11,500 (~$7.67 USD) — a saving of ₩1,500 per ticket. The service is identical either way, but online booking also allows seat selection, which walk-up purchase does not always guarantee.
What should I do if my flight is too early or too late for the AREX?
The first AREX Express from Seoul Station departs at 05:24 and the last at 22:48. If your flight falls outside this window, a taxi or airport bus is the alternative for getting to Incheon. For very early morning or late-night departures, staying overnight at Incheon Airport itself is a practical option — there is a capsule hotel inside the airport that costs considerably less than a city hotel and eliminates the pre-dawn transit entirely.