Your e-ticket says Incheon, Thursday, November 19, departure 1:20 p.m., and then a friend mentions that Korea stops planes for a high school exam. That part is real. The 2027 College Scholastic Ability Test, the suneung (수능), runs that day, and takeoffs and landings across the country are held during its English listening section, 1:10 to 1:35 p.m. If your flight sits anywhere near that window, expect it to move. Look for the new time two days before, check again that morning, and get to the airport through a city that starts work an hour late.
The 25 minutes that move the schedule
The government's exam-day plan, released October 20, puts the test at 1,312 sites from 8:40 a.m. to 5:45 p.m. During the third period, the listening test, airplane and helicopter takeoff and landing times are adjusted so nothing roars over a classroom. Artillery drills and tank movements pause too, which tells you how seriously the country takes those 25 minutes.
The airport window is usually a little wider than the test itself. For the November 13, 2025 exam, the transport ministry banned takeoffs from 1:05 to 1:40 p.m., five minutes on each side, with exceptions only for emergency flights. Planes already in the air had to hold at 3 km or higher, and 140 flights (65 international, 75 domestic) were retimed. At Gimpo, domestic departures scheduled between 12:50 and 1:10 p.m. left about 20 minutes late, and some Jeju arrivals due around 1:10 landed closer to 2 p.m.
That gives you a simple way to read your own booking. A departure scheduled roughly 12:45 to 1:45 p.m. is the one most likely to change. An arrival into Korea in that same stretch can slip too, because the plane may circle instead of landing. A flight at 11 a.m. or 4 p.m. is outside this story, so there's no reason to rebook out of nerves.
When your new time shows up
As of November 2, the government has published the listening-test time but not the exact airport window or a list of affected flights. Last year the details came out on November 11, only two days before the exam, and airlines were told to notify passengers ahead of time. Count the same two days back from Thursday, November 19 and you get Tuesday, November 17. That's the day to open your airline app or booking email and look for a changed time, including in your spam folder.
Then check once more on the morning of the 19th on Incheon Airport's departure flight page or Gimpo's departure and arrival page. On the terminal boards, the column to watch is 변경시각 (byeongyeong sigak), labeled "New Time" in English, and a delay shows as 지연 (jiyeon). Whatever time appears there is the one to plan around, not the time printed on your original ticket.
The weak spot is a connection. Say you fly Jeju to Gimpo at midday and then cross to Incheon for an evening international flight, or you land at Incheon around 1 p.m. with a domestic hop after. A shift of 20 to 50 minutes on the first leg can eat a transfer that looked fine in October. On November 19, give that gap at least an hour more than you normally would, and if your fare lets you move one leg for free or cheaply, move it now rather than on the day.
The morning before you fly
The other half of exam day happens before lunch. Students travel between 6:00 and 8:10 a.m., and subway lines in the Seoul metropolitan area run extra trains in that window. Government offices and companies are asked to start work after 10 a.m. It's a request rather than a rule, but it pushes the usual commute later. If you're rolling a suitcase to the airport train, going before 8 a.m. gets you the extra trains, and going after 10 avoids the office crowd that would normally ride an hour earlier.
Taxis need one extra thought. Vehicles can't drive into the last 200 meters around a test site, and anyone dropped off nearby walks the rest. If your guesthouse is next to a school hosting the exam, ask the driver to pick you up on the main road instead of at the door, and leave five extra minutes for the walk.
From 8:40 a.m. to 5:45 p.m., buses and trains near test sites slow down and hold their horns, and events and construction nearby are asked to keep noise down. You don't need to tiptoe through Seoul. But if you're walking past a school that is hosting the exam around 1 p.m., keep phone calls short and pick your suitcase up over rough pavement instead of rattling it along.
One limit to keep in mind: everything here covers airports in Korea. If you're flying in from abroad, your airline may hold or retime the flight before it leaves, so the notice can come from the departure end. And until the ministry posts this year's airport window, the 1:05 to 1:40 p.m. range is last year's pattern, not a promise.
Set a phone reminder for Tuesday, November 17 to check your flight time. That one check covers most of what exam day can do to your trip.
Sources checked November 2, 2026
- Ministry of Education via Korea.kr Policy Briefing, 2027 CSAT day support plan (October 20, 2026)
- Korea.kr Policy Briefing, exam-day support card news (October 21, 2026)
- Korea JoongAng Daily, "Korea to pause flights, adjust work hours for Nov. 19 college entrance exam" (October 20, 2026)
- Herald Business, report on the Ministry of Land, Infrastructure and Transport flight restrictions for the 2025 exam (November 2025)
- Segye Ilbo, Gimpo departure and arrival delays on exam day (November 13, 2025)
- Incheon International Airport, Departure Flight information page
- Gimpo International Airport, Departure/Arrival information page
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