The BangkokAirportOnline.com website supposedly has this topic covered: Bangkok Airport Shuttle Bus Service. However, whomever created their two orientation guides or maps is — in my opinion — challenged:
Shuttle Bus Express Route:
1. Passenger terminal
2. Car rental center
3. Public transportation center and bus terminal
1. Bus terminal
2. Car rental center
3. Long term parking
4. WFS’s GSE, BAFS
5. TG’s GSE services
6. TG operation center
7. TG Technical Department
8. Suvarnabumi Airport Concourse A (Landside Curb)
9. Suvarnabumi Airport Concourse D (East Landside Curb)
10. Suvarnabumi Airport Concourse D (West Landside Curb)
11. Suvarnabumi Airport Concourse G (Landside Curb)
12. Free Zone Pedestrian Enterance (East)
13. D-CAP, TG Catering
14. Fire and Rescue Department
Why have the numbered map place-names in the legend or index if there are no numbers on the two maps to refer to? And how unhelpful are those various acronyms for anyone who has no familiarity whatsoever with the airport? I think airport visitors seeking a bus only wish to know where to catch one, what it costs, and where it is going to go.
The bottom of that webpage has links to other transportation aids, Public Bus Service being one of them. There you will find descriptions of the buses and where they go.
Now, complaints of mine aside, I learned elsewhere (AirportSuvarnabhumi.com) that each of those numbered locations listed above each of those airport images indicates actual stops that the airport buses are going to make. I suggest referring to that webpage — Airport Shuttle Bus — for it helped me get a much clearer understanding.
Please note, though — the following is from a page titled Airport Bus, Bangkok at VirtualTourist.com, and was updated October 21, 2011:
# 556 do not operate from the Airport any more, you have to take the Airport Train (City Link) to Makasan Station and then catch the 556 right infront of exit if you want to go to Petchaburi Road, Pratunam, Khaosan Road, Grand Palace, and Sai Tai Mai (for taking bus to South) 16 Bhat to Khaosan Road around 22 Bhat for Southern Bus Termonal its a loop bus which can take you back as well.
Take Free Shuttle from Exit # 5 of Arrival Hall to the Transportation Center which is around 10 minutes.
****No. 549 Suvarnabhumi Airport – Minburi (24 hours)
Lardkrabang Pol. Station – Romklaw Rd. – Kasembundit Uni – Minburi*** NO MORE IN SERVICE
No. 550 Suvarnabhumi Airport – Happy Land (05.00 – 24.00 hours)
On-nutch – Khet Prawes – On-nutch Intersection – Bangkapi Intersection – Happy Land
No. 554 Suvarnabhumi Airport – Rangsit (04.00 – 22.00 hours)
Ramintra Rd. – Kaksi – Sapanmai – Entrance of Lamlukka – Krungthep Gate (Sapanmai)
No. 555 Suvarnabhumi Airport – Rangsit (03.30 – 22.00 hours)
Rama 9 Expressway – Dindaeng – Toll Way – Jaelenk New Market – Donmuang – Future Ransit
No. 559 Suvarnabhumi Airport –Rangsit (06.00 – 22.00 hours)
*** In case the Bus is full of passenger, there will be no pick up at the passenger platform on the 1st Floor
Same Number Airconditioned Vans also service to same destinations for the fare 25-70 Bhat
Direct Van to Khaosan Road around 100 Bhat
As for Airport Express Bus Service:
Airport Express Bus service was terminated permanently on 1 June 2011. Public taxi and Airport Rail Link services are recommended as an alternative.
If the above declaration is true, you will nonetheless still find descriptions of the Airport Express Bus Service all over the Web — even at the Thai Airways website on a page describing Transportation To/From Suvarnabhumi Airport.
Should money be of scant concern, I suppose you could always arrange your own shuttle service, complete with a driver just beyond the baggage claim area, who will be holding a sign with your name on it — a couple such services are BangkokShuttle.com and Bangkok.Airport-Shuttle.com.
As part of a November 16, 2012, post edit, here are are few recent travel-related references. At least one or two should be of interest to you:
Latest Two key moves for Phuket public transport are beginning with tenders now open for three new airport bus routes and taxi groups to meet about an innovative new system. … Khun Teerayut has recommended adopting the successful system that operates at Bangkok’s Suvarnabhumi Airport, where taxis form one queue and the airport gains 50 baht per pickup. Today is also a significant milestone for Phuket’s public transport future with tenders now open for …
Publish Date: 11/11/2012 12:31
3. Take either bus route 554 or 555 from the bus terminal at Suvarnabhumi Airport to Don Mueang Airport. (Recommended Route). Always allow at least 4 to 5 hours to complete the transfer between Suvarnabhumi Airport and …
Publish Date: 10/29/2012 23:23
(Airport Shuttle Bus, Closed!) It was almost 2 years since I was last seen in Bangkok, March 2011 to be exact. I survived going in and out of Bangkok, going to and from the airport using the airport shuttle bus for the cheapest …
Publish Date: 09/29/2012 3:38
Depending on the time of day, it can take up to 90 minutes to travel between Don Muang and Suvarnabhumi. The AoT says it will set up a free shuttle bus service between the two airports. For now, public buses run the route …
Publish Date: 08/20/2012 19:00
There is a free shuttle bus that is now running between both airports from 6am till 10pm every day. To go from Don Muang – Suvarnabhumi: take the shuttle bus at the ground floor arrival of terminal1. To go from Suvarnabhumi – Don Muang: …
Publish Date: 11/11/2012 14:07
Transportation, Bus, Taxi and Train From Don Mueang Airport to Bangkok City Center. If you travel by yourself or in a small group, it’s still comfortable to ride the public buses or train. But if you’re carrying big luggage, taking a …
Publish Date: 10/26/2012 4:38
“AoT Vice President Somchai Sawasdipol said the shuttle bus services will be offered for passengers between Suvarnabhumi International Airport and Don Mueang Airport next month after low-cost carriers move their …
Publish Date: 11/04/2012 0:00
… in Bangkok, getting to the Suvarnabhumi International Airport for an early morning flight is a horrible prospect. Forget waking up at 3am to beat the traffic that clogs expressway entrances and exits for an 8am flight and stay at one of these Bangkok airport hotels instead. … a few great eateries and lounges, a swimming pool, spa and fitness center and business and conference facilities. The hotel offers a free shuttle bus service to and from Suvarnabhumi, which is 10 kilometers away.
Publish Date: 12/18/2009 1:27
Airports of Thailand (AoT), announced that shuttle bus services between Bangkok’s two airports will be provided for passengers with connecting flights starting next month.
Publish Date: 09/11/2012 18:45
Somchai Sawasdipol, vice president of Airports of Thailand (AoT) and director of Suvarnabhumi Airport, reportedly said that four buses will run between Don Muang and Suvarnabhumi on an hourly basis from 6 a.m.–10 p.m. …
Publish Date: 10/06/2012 15:03
Suvarnabhumi Airport BUS STATION Bangkok Thailand LOCAL BUS
Uploaded by bkkapt on Dec 12, 2006
Bus 552 to Khlong Toei (by Sukhumvit Road, last stop on Sukhumvit is Asoke)
Bus 552A to Bangna Paknam (Samut prakan)
Bus 553 to Srinakharin Road Paknam (Samut Prakan)
Bus 554 to Don Muang airport
Bus 555 to Central Ladphrao (department store)
Bus 555 to Don Muang (ex airport)
Bus 555 to Rangsit
Bus 556 to Southern bus terminal (bus station for people going to Kanchanaburi or to the south)
Bus 558 to Central Rama 2 (department store)
Bus 559 to Future Park Rangsit (department store)
Free shuttle bus from airport to go to the bus station where you can take a local bus to go downtown or around Bangkok.