Doing something slightly stupid next month. Flying into Don Mueang on a cheap carrier and out of Suvarnabhumi the same evening on a completely different airline, two separate bookings, nothing connected. Yes I know. It was 90 quid cheaper than doing it properly and I have five hours between them.
Everyone keeps telling me there is a free bus between the two airports so I stopped worrying. Then I read that it is only for transfer passengers and you have to show a connecting ticket, which sounds like exactly the thing I do not have. So which is it. Does a separate booking count as a connecting flight for the purposes of the bloke checking at the door, or am I paying for a car across the city like everyone else.
And if it is the car, how long does that transfer actually take. Five hours sounded like loads when I booked it and now I am less sure.
The free AoT shuttle is real but it is for passengers connecting between the two airports and you show your onward flight ticket to board. Whether a separate booking passes is the bit nobody can promise you, because it is a person looking at your boarding pass or booking, not a computer.
I have seen people wave a printout of a different airline's booking for the same day and get waved on. I have also seen someone turned away. It is not a system you should build a five hour connection around.
The thing that would worry me more than the bus is the road. That transfer is right across the top of the city and it is entirely at the mercy of the traffic. I have done it in fifty minutes on a quiet Sunday and I have done it in over two hours on a weekday afternoon when something went wrong on the expressway.
Five hours is fine on paper and gets thin fast once you take off the bag drop and the queue at the far end.
#4August 3, 2026, 11:20 am Founder here. I have done this exact hop more times than I would like, including once with about the same margin you have, so let me lay it out plainly.
The rule as it is written: Airports of Thailand run a free shuttle bus between Don Mueang and Suvarnabhumi for passengers with a connecting flight the same day, and you show the onward ticket to board. That is the whole of the entitlement. It says nothing about the two flights being on one booking, which is why you get the mixed reports Becca describes. In practice people with a same day onward flight on a separate ticket often do get on, because what is being checked is a flight that day, not a fare construction. But it is a discretionary check at a door, and the bus also has a finite number of seats and a fixed frequency, so a full one is a real possibility even if you qualify.
My honest advice is to treat the shuttle as a bonus and not a plan. Budget for a road transfer, and if the bus works out you have saved money. Allow two hours for the road crossing rather than one, because Somchai is right that this is the single most traffic exposed journey in Bangkok, and add on top of that the check in and security at the far end for an international departure. Five hours between a landing and a take off at two different airports is workable but it is not generous once you subtract immigration, bags and the fact that your first flight may itself be late, and with two separate tickets nobody owes you anything if it is.
One option worth knowing since you are going the DMK to BKK direction: the road is not the only way. You can take the commuter rail or a taxi down into the city, pick up the Airport Rail Link and run out to Suvarnabhumi on rails, which is slower on paper and completely immune to a jam on the expressway. It is more faff with luggage. I have used it on a tight afternoon and been glad. The rail side of that is set out in BTS and MRT Bangkok, and the options at the Suvarnabhumi end are in getting from Suvarnabhumi into Bangkok.
Confirm the current shuttle timings and conditions on the airport's own information desk when you land, since AoT adjust the service, and do not let a forum thread from a month ago be the reason you miss a flight.
Jon Ferris said:
treat the shuttle as a bonus and not a plan
Fair. That is the answer I did not want and probably needed. I will plan on paying for a car and treat the bus as a maybe.
One more thing then. If the first flight is late and it gets genuinely tight, is a motorbike taxi across town with a rucksack a mad idea or a legitimate move. I have seen people do it in the traffic and it looks like the fastest thing on the road by miles.
With a rucksack, in a panic, for a long airport to airport run on expressway roads? I would not. A short hop through a jam in town is one thing, an hour and a half of it with luggage on your back is another entirely.
If it goes really wrong the better move is honestly to accept you are missing the flight and start dealing with that on the phone rather than doing something reckless to save it. Separate tickets mean it is your problem either way, so at least be in one piece for it.
Agree with Hazel. And one detail people forget on that route, the expressway tolls between the two airports are on the passenger, so a metered car will have those added at the booths. It is not a big number but it surprises people who thought the meter was the whole bill.
Enjoy your 90 quid. I have made exactly the same trade and I will probably make it again.
