On my first trip to Korea, I flew budget airline AirAsia and ended up arriving at 11pm in winter. Heading into Seoul to look for accommodation in the freezing cold was not a good idea, so I opted to sleep over in the airport.
I’ve slept in many airports and even in most first-world countries (eg. Australia, Spain etc) the best you can expect is a nap on a row of chairs and maybe a wipe-down in the toilet. Unless you want to fork out big money for the posh airport hotel.
To my surprise, Incheon Airport actually has a Spa on Air where you get a nice hot shower and sauna in luxurious clubhouse-style facilities, clean clothes to sleep in and a warm sleeping area, all for 20,000won or US$20. Read more here.
Then of course there are the live performances. It seems that you can always find a classical quintet or folk song duo somewhere around the corner. How charming!
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Prices provided in Korean won or US dollars.