DMK —> BKK ? NP!
Need to transfer from Don Mueang Airport to Suvarnabhumi? No worries. The transfer is painless and free. There’s no need to make arrangements before hand, just show up at the ticket desk and you’ll be directed onto the next shuttle bus. While the transfer is reliable and easy, there isn’t a single sign to point you in the right direction. Let me do that for you.
If you’re picking up baggage :: get your stuff from the carousel, head out the main doors (there is only one set) and turn right.
If you didn’t check luggage :: take the escalators down into the baggage claim area and walk straight through the main doors (there is only one set) to leave the baggage area and turn right.
As you head down the corridor, you’ll see escalators heading up, walk to the right of them and keep going. Â Then you’ll pass a bunch of counters for cell SIM cards and you’ll see no signage for the bus. At this point, you’ll think you’re going in the wrong direction down a deserted hallway.
You’ll come to a wall and the only way is left. Once you turn the corner you may be overwhelmed by the amount of people. They’re all waiting for taxis, keep going, veer to the right and head out either door 7 (right by the bottom of the escalators ) or the next one to the right, door 6.
Once outside you’ll see a small bright blue counter and a long row of chairs. The counter says AOT (Airports of Thailand). You must get a stamp from this counter or you won’t be allowed on the shuttle. Show the worker your boarding pass or some confirmation number for your upcoming flight and he’ll give you a stamp. Since you probably won’t have a physical boarding pass or access to a printer, simply screenshot the flight and confirmation number from your email or airline app. I do this every time.
 Shuttle buses leave from directly in front of the counter. If there isn’t one waiting already, you’ll know when it arrives as everyone with a stamped hand will board. Buses leave every 15 minutes or so.  If you want a good seat and you have time to spare, wait for the next one.
Just so ya know :
Seats in the back row have an attractive amount of legroom, but do not sit there. Machinery under the rear of the bus makes those four seats overwhelmingly hot. You’ve been warned.
Beware that Bangkok traffic is insane and it could take you up to two hours to reach the airport as it’s quite far away. Think about rush hour, timing, days of the week and holiday madness while concocting your plan. That being said, most times it’s a quick 40 minutes.
You Should Definitely Take the Shuttle Because :
It’s free
It’s reliable
It’s convenient with about four buses leaving every hour
It’s free 🙂
Good luck & safe travels!