Two people with carry-on bags landing at Terminal 1 and heading for Seoul Station or Myeongdong get the best deal on the AREX express train: 13,000 KRW each, 43 minutes. Add a third person on that same route and a shared metered taxi starts to beat three bus tickets. Head for Gangnam instead and you need four people in one taxi before it pays off. There is no single answer that covers every stop, so the rest of this piece splits the math by destination and by headcount, because that’s where the previous version of this kind of guide usually gets it wrong.

What each option actually costs

Mode	Adult fare	Time / schedule	Notes
AREX express (Incheon–Seoul Station)	13,000 KRW	43 min from T1, 51 min from T2	No T-money, buy a separate ticket
AREX general (all-stop) from T1	4,750 KRW by T-money card	stops at Gongdeok, then Hongdae, then on to Seoul Station	Single-use token costs 100 KRW more, 500 KRW deposit refunded
AREX general (all-stop) from T2	5,350 KRW by T-money card	same line, extra distance from T2	—
6015 limousine bus (Myeongdong / Chungjeongno / Gongdeok / Mapo)	17,000 KRW / 12,000 KRW child	airport-bound first 04:24, last 19:40	Earliest last bus of the three routes
6020 limousine bus (Yeoksam / Gangnam Station exit 12 / Gyodae / Banpo)	17,000 KRW / 11,000 KRW child	airport-bound first 06:15, last 23:02, every 20–50 min, 32 runs a day	—
6200 limousine bus (Jamsil / Lotte World / Jamsil Park Rio)	17,000 KRW / 11,000 KRW child	airport-bound first 05:50, last 23:05, 38 runs a day	—
Metered taxi, regular sedan	4,800 KRW for the first 1.6 km, then 100 KRW per 131 m	plus 100 KRW per 30 seconds stuck in traffic	No city-limit surcharge on this route
Metered taxi, deluxe / 9-seat large	7,000 KRW for the first 3 km, then 200 KRW per 151 m	same no-surcharge rule	—
Incheon Airport Expressway toll (car)	3,200 KRW one-way	—	Cut from 6,600 KRW after an October 2024 toll reduction; still posted at 3,200 KRW as of today’s check

Every fare above is a posted rate, not an estimate. The exception is the metered-taxi totals further down, which are built from these rates plus a distance figure that isn’t Korean-sourced. That distinction matters for the math below, so it’s flagged again where it’s used.

Who this actually applies to

• If you’re carrying just hand luggage and your stop is Seoul Station, Myeongdong, Chungjeongno, Gongdeok, or Mapo → the AREX express train wins on time and isn’t far off the bus on price.
• If your destination is Hongdae → skip the bus search entirely, there isn’t a direct limousine route there; the AREX general train stops at Hongdae directly, 4,750 KRW by card.
• If you’re traveling alone or as a pair to any of the three limousine routes → the bus beats a taxi on every destination in this guide; don’t bother pricing a taxi for one or two people.
• If there are three or more of you heading toward the Myeongdong/Seoul Station cluster → run the shared-taxi math in the next section before you buy three bus tickets.
• If there are four or more of you heading toward Gangnam → same thing, check the math below.
• If you land at T2 and need T1 (or the reverse) → take the free inter-terminal shuttle, not a second AREX ticket.

Where the headcount changes the answer

A metered taxi charges per car, not per passenger, so the more people you split it with, the better it looks against a bus that charges per seat. The catch is that the taxi total below only exists for two destination clusters where a distance figure could be confirmed at all.

For the Myeongdong / Seoul Station cluster, the road distance itself (about 53 km, about 48 minutes) comes from an English-language routing aggregator, not a Korean primary source. The fare formula above is Korean-sourced, the distance figure isn’t. Running that distance through the sedan rate gives roughly 47,000 KRW total for the ride, including the 3,200 KRW toll (the exact math comes to 47,240 KRW; call it about 47,000). Compare that flat total against 6015 bus tickets at 17,000 KRW each:

• 1 traveler: one bus ticket at 17,000 KRW is far below the ~47,000 KRW taxi total. Bus wins.
• 2 travelers: two tickets at 17,000 KRW each still land well under that ~47,000 KRW flat fare. Bus wins.
• 3 travelers: three tickets already total 51,000 KRW, past the ~47,000 KRW taxi fare. Taxi wins.
• 4 travelers: a fourth ticket only widens the gap in the taxi’s favor

For Gangnam, the same distance-confirmation problem applies, and the road distance is even less certain: roughly 59 km and 52 minutes, again from the same non-Korean routing source, run through the identical sedan rate to land at roughly 51,000–53,000 KRW total. Against 6020 bus tickets at 17,000 KRW each:

• 1–2 travelers: one or two tickets at 17,000 KRW each stay well under the 51,000–53,000 KRW taxi estimate. Bus wins comfortably.
• 3 travelers: three tickets already total 51,000 KRW, right at the low end of that 51,000–53,000 KRW estimate — call this one a toss-up, not a clean win either way
• 4 travelers: a fourth ticket pushes the bus total past the top of that range. Taxi wins from here.

For Jamsil on the 6200 route, there’s no verified taxi-fare estimate at all in the sourcing for this guide, distance or flat rate. If your group is large and headed to Jamsil, either buy the bus tickets (the only fully verified price for that stop) or get an actual quote from a taxi at the stand rather than trust a number nobody here can confirm.

None of the above works past four passengers in a regular sedan — that’s a physical seating limit, not a pricing one. For larger groups, a single operator, taxitour.kr, posts flat pre-booked rates by destination cluster. Treat these as one company’s prices, not an industry average:

Destination cluster	Sedan	9-seat large	Premium
Myeongdong / Gwanghwamun	85,000 KRW	120,000 KRW	150,000 KRW
Seocho / Gangnam	90,000 KRW	130,000 KRW	160,000 KRW

Price out a full group of eight against those van rates and the bus stays ahead for almost the whole range: seven bus tickets at 17,000 KRW each still add up to less than either the 120,000 KRW or the 130,000 KRW van, so the van only earns its keep once the eighth seat is filled and every ticket is bought.

Doing the math for one real trip

Take three adults flying into T1 and heading for Myeongdong. Three 6015 tickets at 17,000 KRW each come to 51,000 KRW total. A shared metered taxi for the same three people, using the sedan’s base fare (4,800 KRW for the first 1.6 km), the per-131-meter distance charge over that same route, and the 3,200 KRW expressway toll, comes to roughly 47,000 KRW for the whole car — split three ways, that beats three separate bus tickets. Swap in a fourth adult and the gap only grows, since the taxi total doesn’t change but a fourth bus ticket does.

The mistakes that trip people up in the first day

• The city-limit surcharge myth. Incheon Airport sits inside a shared taxi zone with Seoul, Incheon, and four Gyeonggi cities (Bucheon, Gwangmyeong, Gimpo, Goyang). The 20% (Seoul/Gyeonggi-registered) and 30% (Incheon-registered) surcharges only apply once a taxi leaves that zone. A ride from the airport into Seoul proper never triggers it, regardless of where the car is registered. A separate late-night surcharge (20% from 22:00–23:00 and 02:00–04:00, 40% from 23:00–02:00) is unrelated and does apply.
• Anyone who approaches you inside the arrivals hall offering a ride is not supposed to be doing that. The airport’s own guidance is to board only at the designated stands. Vans that tout for passengers there are working around the rules, not saving you time.
• The express train does not take T-money. It needs its own ticket. Only the general, all-stop train accepts a transit card, which catches people out at the gate.
• Bus numbers do not overlap. 6015 runs to Myeongdong and Mapo, 6020 to Gangnam, 6200 to Jamsil. Board the wrong one and you are paying for a taxi or a subway transfer you had not planned.
• The last 6015 leaves the airport at 19:40. That is over three hours earlier than 6020 at 23:02 or 6200 at 23:05, so a delayed flight can strand you on that one route while the others still run.
• Between terminals, the shuttle bus is free and takes about 15 minutes from T1 to T2. AREX charges 1,050 KRW for the same hop in about 6 minutes, which is only worth it if you were boarding a train anyway.

Booking and boarding, step by step

1. Decide your destination cluster first (Seoul Station/Myeongdong, Gangnam, or Jamsil) since that decides which bus number or train stop applies to you.
2. For the AREX express, buy a ticket (not a T-money tap) at the airport station or through the operator’s site before boarding: https://www.airportrailroad.com
3. For the AREX general train, tap in with a T-money card, or buy a single-use token with a refundable deposit; check the stop list if Hongdae is your destination: https://www.airportrailroad.com/train/normal/introduce
4. For a limousine bus, confirm your number against the official route search before you queue, since 6015/6020/6200 stop in different parts of the city: https://www.airport.kr/ap_ko/976/subview.do
5. Route-specific timetables and tickets: https://airportlimousine.co.kr/ (6015), https://www.seoulairbus.com/ (6020, 6200), https://www.klimousine.com/ (alternative operator)
6. For a taxi, use only the marked taxi stands and ask for a metered ride; the official taxi-zone and surcharge rules are here: https://www.airport.kr/ap_ko/987/subview.do
7. Seoul’s official taxi fare notice, if you want to check the rate table yourself: https://news.seoul.go.kr/traffic/archives/1659
8. Expressway toll reference: https://www.hiway21.com/user/nd64668.do
9. Inter-terminal transfer options (free shuttle vs. paid AREX): https://www.airport.kr/ap_ko/997/subview.do

Where to book

Buy the AREX express ticket at the station rather than online. It is a separate ticket from the general train, and T-money will not open the gate for it. Fares and timetables for both trains are on the operator’s site: https://www.airportrailroad.com/train/normal/fare

For the buses, start at Incheon Airport’s own route search and match a number to your neighbourhood before you commit to a stop: https://www.airport.kr/ap_ko/976/subview.do

Then check the operator that runs it. Route 6015 and its sister routes are at https://airportlimousine.co.kr/sub/sub01.php?cat_no=21, while 6020 and 6200 are at https://www.seoulairbus.com/

Taking a taxi? Read the surcharge rules before you get in. The airport publishes them alongside the official stand locations: https://www.airport.kr/ap_ko/987/subview.do

Sources I checked

1. airport.krKorean-language source
2. airportrailroad.comKorean-language source
3. airportrailroad.comKorean-language source
4. hiway21.comKorean-language source
5. airportlimousine.co.krKorean-language source
6. seoulairbus.comKorean-language source
7. taxitour.krKorean-language source
8. airport.krKorean-language source