Passenger Service Charge (PSC) for 
international flights Baht 700 
domestic flights Baht 100

Public Bus Public Bus
- Air-conditioning buses, service  routing can be divided into 2 group:
Group Bangkok and Neighboring
area to Suvarnabhumi
Airport
There are 6 routes
1. Number 549 SA. – Minburi
2. Number 550 SA. – Happy Land
3. Number 551 SA.– Victory Monument (Express Way)
4. Number 552 SA.– On Nuch BTS station
5. Number 553 SA. – Samut Prakan
6. Number 554 SA. – Bangkok International Airport(Express Way )

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Group3 Public bus services between SA. and 3 Provinces
1. Number 389 SA. – Pattaya
2. Number 390 SA. – Talad Rong Kluea
3. Number 825 SA. – NongKhai

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wiki
The airport operates 4 airport express bus routes to downtown Bangkok. The buses are air-conditioned with ample luggage space. The fare is 150 baht for the entire route. Passengers can get on the bus on the first floor of the terminal. The four routes are as follows:

AE1 Suvarnabhumi-Silom Rd. (by expressway)
AE2 Suvarnabhumi-Khao San Rd.(by expressway)
AE3 Suvarnabhumi-Central World via Sukhumvit Rd.
AE4 Suvarnabhumi-Hua Lamphong (central Bangkok Railway Station) via Victory Monument(by expressway)

Additionally, 12 city bus routes operated by Bangkok Mass Transit Authority (BMTA) serve the airport's dedicated bus terminal. City buses offer a cheaper alternative of Bt35 flat fare, compared with the airport express bus, but passengers must take a shuttle bus to the public transportation center's bus terminal before they can board the bus. The 12 routes are as follows:

549 Suvarnabhumi-Minburi-Bangkapi via Seri Thai Rd.
550 Suvarnabhumi-Happy Land
551 Suvarnabhumi-Victory Monument (by expressway)
552 Suvarnabhumi-Khlong Toei (Customs Dept.) via Onnut BTS station
552A Suvarnabhumi-Samut Prakarn (Praeksa Garage)
553 Suvarnabhumi-Samut Prakarn (Crocodile Farm Garage)
554 Suvarnabhumi-Rangsit via Don Mueang and Ram Indra Rd. (by expressway)
555 Suvarnabhumi-Rangsit via Don Mueang and Central Plaza LadPhrao (by expressway)
556 Suvarnabhumi-Bangkok Southern Bus Terminal via Democracy Monument and Khaosan Rd.(by expressway)
557 Suvarnabhumi-Wong Wian Yai (The Great Circle)
558 Suvarnabhumi-Central Plaza Rama II
559 Suvarnabhumi-Future Park Rangsit via Dream World (by expressway)