http://en.wikipedia.org/wiki/Hong_Kong_International_Airport

According to its website, the passenger terminal of the HKIA is the world's largest airport terminal building, with a total gross floor area of 570,000 m²(it was 550,000 m² before the expansion of the East Hall). Despite claims from the owner of the new Bangkok airport, Suvarnabhumi Airport, that their new passenger terminal is the world's largest at 563,000 m². HKIA still maintains at number one with 570,000 m² when the airport authority completed expanding within the existing terminal in 2004 from 550,000 m² to make room for the greatly expanded shopping mall, SkyMart, which is 39,000 sq m itself, at the East Hall area. The 570,000 m² figure does not include the new 140,000 m² Passenger Terminal 2, SkyPlaza, that will be completed by the end of 2006.

Yeah, Hong Kong International Airport's main terminal building does feel bigger than Suvarnabhumi's but the size-difference between the two is so minimal that hardly anyone will notice. And, imho, Suvarnabhumi's terminal is not yet as efficient as Hong Kong Chek Lap Kok's.

But, I would like to point out that the by late 2007, Beijing-Capital's Terminal 3 will dwarf both since it'll be nearly twice as large at one million square meters. :yes:

Terminal 3 got two terminals (three in the future). I am not sure you can consider that has "single terminal building" though.

Terminal 3 got two terminals (three in the future). I am not sure you can consider that has "single terminal building" though.

very good point..

Terminal 3 got two terminals (three in the future). I am not sure you can consider that has "single terminal building" though.
that's correct... i can say beijing's new terminal 3 is the largest airport terminal complex in the world, not the largest single terminal building...

yeah, it is definitely the world's largest passenger terminal building complex built in one single phase.

Wikipedia:
"On February 5, 2006, the immense Terminal 4 was inaugurated—making Madrid-Barajas the world's largest airport, in terms of terminal area, with an area of more than one million square meters (11 million square feet)".

Madrid Barajas T4 VIDEO (in english): http://video.google.es/videoplay?docid=-3079309382668834508&q=barajas+t4

Madrid Barajas T4 has a total area of 1,200,000 sq metres.
http://www.richardrogers.co.uk/render.aspx?siteID=1&navIDs=1,6,12,1189

Madrid Barajas T4 VIDEO (in english): http://video.google.es/videoplay?docid=-3079309382668834508&q=barajas+t4

Best Public Space 2006
Madrid Barajas International Airport
By Richard Rogers Partnership

http://www.travelandleisure.com/designawards/images/da_2006_publicspace.jpg

In this dramatic new airport terminal, the ceiling—rolling sine waves of bamboo-clad steel—is held up by brightly painted columns, and there's sunlight everywhere. Rogers's design is "reminiscent of a sailboat or a classic ship," the jury remarked. "There's a lightness to it—a buoyancy." From arrival halls to check-in, from security to departure, spaces are clearly organized and easy to navigate, unified by the soaring central corridor.

http://www.travelandleisure.com/designawards/publicspace.cfm


Wallpaper's Best New Airport
http://www.dexigner.com/forum/uploads/post-92-1139426550.jpg
Its other virtues aside, architect Richard Rogers' Madrid's Barajas Airport is a breathtaking study in the use of light and space...more:http://www.wallpaper.com/design/1098



RIBA (Royal Institut of British Architects) European Award winner 2006:
Barajas Airport, Madrid, Spain
Architect: Richard Rogers Partnership
Co-architect: Estudio Lamela
Client: AENA
http://www.architecture.com/go/Architecture/Also/Awards_5439.html
The building presents a straightforward linear diagram, in the form of a clear sequence of spectacular spaces for both departing and arriving passengers. The parallel linear floor planes are separated from each other by dramatic, light-filled canyons across which bridges span.

A restrained and functional approach is consistently applied to great effect, resulting in a visually clean, remarkably uncluttered and soothing environment.

http://www.architecture.com/imageLibrary/jpeg330/11349.jpg

Madrid Barajas T4 has a total area of 1,200,000 sq metres.
http://www.richardrogers.co.uk/render.aspx?siteID=1&navIDs=1,6,12,1189

Madrid Barajas T4 VIDEO (in english): http://video.google.es/videoplay?docid=-3079309382668834508&q=barajas+t4

On February 5, 2006, the immense Terminal 4 was inaugurated—making Barajas the world's largest airport, in terms of terminal area, with an area of more than one million square meters (11 million square feet).

http://en.wikipedia.org/wiki/Madrid_Barajas_Airport

A Terminal Building is separated from the car park by forecourts, which act as a transport exchange for buses, taxis, metro, trains and private vehicles. It will serve international flights and Shengen flights (flights within European Union countries). With nearly 500,000 sq m (distributed over six levels), it has 174 check-in counters, 38 stands for planes and airport walkways located in the boarding pier that measures 1.2 km.

http://www.richardrogers.co.uk/render.aspx?siteID=1&navIDs=1,6,12,1189

I mean the single terminal building, not the total terminal building

wow, looking huge!!

Madrid might have the title as having the largest airport and the largest overall terminal size, but Hong Kong's still claims the title as "THE WORLDS LARGEST SINGLE TERMINAL" Madrid has how many terminals? HK Terminal one already claimed that title not included the newly built T2.

HKIA is still my favourite airport, simple and not too complicated and it does feel bigger than the Bangkok new one