BTS and MRT Bangkok: How the Skytrain, Underground and Airport Rail Link Fit Together

Bangkok’s rail network is three separate systems on one map: the elevated BTS Skytrain, the MRT underground and elevated lines (blue and purple), and the Airport Rail Link that runs out to Suvarnabhumi. Once I understood they were separate companies with separate cards that simply meet at shared stations, the whole thing stopped being a puzzle. I spent my first months in Bangkok tapping a Rabbit card uselessly at MRT gates and wondering why it beeped angrily at me. Here is how the network actually fits together, so you skip that stage.

How the three systems fit together

Bangkok has three rail systems, run by different operators, that interchange at a handful of shared stations. The BTS Skytrain runs on elevated tracks above the main roads, the MRT runs mostly underground on its blue line plus an elevated purple line, and the Airport Rail Link (ARL) connects Suvarnabhumi to the centre and meets both. The ARL runs Suvarnabhumi to Phaya Thai in about 30 minutes for roughly 15 to 45 baht ¹, joining the MRT at Phetchaburi and the BTS at Phaya Thai on the way.

The mental model that made it click for me: think of it like separate bus companies whose routes happen to cross. You change systems at the interchange stations by tapping out of one and into the next, exactly as you would swap between two operators anywhere. Nothing flows through automatically.

The BTS Skytrain

The BTS Skytrain is Bangkok’s elevated rail, running on two main lines (Sukhumvit and Silom) that cross at Siam, the busy interchange in the shopping district. It is the network most visitors use most, because it threads through the hotel, shopping and nightlife areas along Sukhumvit and Silom Roads. Trains are air-conditioned, run every few minutes at peak, and the whole thing sits a storey above the traffic. The BTS runs on its own Rabbit stored-value card, or you can buy single-journey tokens at any station ².

The first-hand tip: at Siam the platforms stack, so check whether you want the Sukhumvit line or the Silom line before you tap in, because they diverge and getting the wrong one costs you a doubling-back. The signs are good once you know to look for the line name rather than just the direction.

The MRT blue and purple lines

The MRT is Bangkok’s metro, mostly underground on the blue line with a separate elevated purple line to the north-western suburbs. The blue line loops through the old city, Chinatown and the main train stations, and reaches places the BTS does not, so between the two you cover most of central Bangkok. The MRT is run separately from the BTS and uses its own stored-value card, not the Rabbit card, though single-journey tickets are sold at every station ³.

Because the MRT is underground, the stations are cooler and the entrances are less obvious from street level than the BTS staircases; look for the MRT logo on the low glass entrance boxes. When I need Hua Lamphong, Chinatown or the Chatuchak weekend market, the MRT is the line I want.

The Airport Rail Link

The Airport Rail Link is the train from Suvarnabhumi airport into the city, and the cleanest way in when the roads are jammed. It starts from the basement beneath the passenger terminal and runs to Phaya Thai in about 30 minutes for roughly 15 to 45 baht depending on distance ¹. Crucially it interchanges with the MRT at Phetchaburi (a short covered walk to Makkasan) and with the BTS at Phaya Thai, so you can arrive and continue across the city on rails the whole way.

I default to the ARL whenever I land at Suvarnabhumi in daylight with hand luggage, because it sidesteps the single worst part of the journey, which is the expressway back into town at rush hour. For the full picture of every route in from that airport, including the official taxi queue and private cars, see the guide on getting from Suvarnabhumi into Bangkok.

Cards versus single tickets

You have two ways to pay: a stored-value card for each system, or single-journey tickets bought trip by trip. The BTS uses the Rabbit card and the MRT uses its own card, and the two are not interchangeable ². If you would rather not carry cards, both systems sell single tickets from machines at every station, so a card is a convenience, not a requirement.

My rule of thumb: if you are in Bangkok for a few days and will ride several times a day, buy the card for whichever system you will use most and top it up, because it saves queueing at the ticket machine each time. For a short stop, single tickets are simpler. Either way, keep small coins and notes handy, because the machines can be fussy about what they accept ³.

When rail beats the road

Take the train whenever your journey runs alongside a line at a busy time, because Bangkok traffic can turn a short hop into an hour. A metered taxi starts at a 35 baht flagfall and then charges for both distance and the time it spends crawling, with expressway tolls paid on top by you ⁴, so a gridlocked trip costs more and takes far longer than the fixed, predictable train. At rush hour and in the wet season downpours, rail is simply the adult choice.

The honest limit is coverage. The lines only reach where they reach, so plenty of Bangkok is still a taxi or Grab trip, or a rail journey finished off with a short hop by metered taxi at the far end. I plan most days as “rail for the long leg, taxi for the last mile”, and that combination beats either one on its own.

---

This is general know-how, not timetable gospel. Fares, hours and card rules in Bangkok change without much notice, so treat the figures here as approximate and confirm the current details on the operator’s own site before you rely on a last train.