National Foundation Day 2026 falls on Saturday, October 3, with a substitute holiday on Monday, October 5 — so October 3–5 is a 3-day weekend.
National Foundation Day Korea 2026: When Is It, and Is It a Good Time to Visit?
| October 3 | Saturday |
|---|---|
| October 5 | Monday |
| KTX booking | September 3 |
National Foundation Day (Gaecheonjeol) falls on Saturday, October 3, 2026, and the substitute holiday lands on Monday, October 5.
Because the holiday falls on a Saturday, Korean rules move the day off to the next non-holiday weekday, which is why Monday October 5 is also free.
For a visitor, this means three straight days, October 3–5, when central Seoul runs on a holiday pattern — and the one thing that decides whether it works for you is how early you book.
On the official Korea holiday calendar (data.go.kr), National Foundation Day 2026 is October 3 with a substitute holiday on October 5, making a 3-day weekend.
If you can lock trains and popular slots early, this weekend is a workable time to visit; if everything is booked last minute, expect the worst crowds of the season at stations and terminals.
What Is Closed on October 3, 2026?
On October 3, 2026, banks and government offices in Korea close, but ATMs, card payments, and convenience stores (CU, GS25, 7-Eleven) work normally.
Major attractions run too: N Seoul Tower, Lotte World, and Everland normally open on the holiday, and department stores such as Lotte typically trade on holiday hours.
The practical check is cash: branch counters are shut, so plan withdrawals and card use around machines, which are unaffected.
If your trip depends on a government office, embassy, or bank branch, schedule it outside October 3 and 5.
| Category | Status Oct 3–5, 2026 |
|---|---|
| Banks and government offices | Closed |
| ATMs and card payments | Normal |
| Convenience stores | Open as normal |
| Department stores | Open, holiday hours possible |
| Tourist sites (N Seoul Tower, Lotte World, Everland) | Normally open |
| Subway and city buses | Weekend schedule |
Are Palaces and Museums Open on Gaecheonjeol?
National museums, including the National Museum of Korea, are generally open on public holidays, but they close on Mondays — so October 5 may be closed unless a special holiday opening is announced.
Gyeongbokgung’s regular closing day is Tuesday, which does not conflict with October 3–5 (Saturday to Monday).
Exact holiday opening hours for each palace and museum are announced by each institution shortly before the holiday, so check official sites in the last week of September.
Changdeokgung’s Secret Garden takes advance bookings, and those slots thin out fast around a holiday cluster.
If a museum on Monday October 5 is central to your plan, confirm that museum’s own notice first and keep a palace as the backup.
Does the Seoul Subway Run on Holidays?
Seoul subway and city buses run on October 3–5, usually on a weekend or holiday schedule with later first trains and reduced frequency.
Highways see temporary peak congestion around holiday clusters, and the Korea Expressway Corporation publishes real-time congestion forecasts for drivers.
Inside Seoul this mainly means longer waits between trains, not a shutdown — leave a buffer for airport connections.
For any problem on the road, the Korea Travel Hotline 1330 operates 24/7 in multiple languages, including holidays.
If you are heading out of the city by car, check the expressway forecast the same morning; if you stay on the subway, just allow extra time.
When Should I Book KTX and Intercity Buses for Oct 3–5?
Book KTX seats the day reservations open — Korail opens bookings about one month ahead, so October 3 seats went on sale from around September 3, and holiday seats sell out fast.
- Korail opens KTX reservations roughly one month before travel (October 3 seats from about September 3).
- Intercity and express bus bookings open roughly 2–4 weeks ahead depending on the operator.
- Reserve tight-capacity slots such as Changdeokgung Secret Garden 1–4 weeks before the weekend.
Holiday clusters concentrate outbound travel on the first day and return travel on the last day, so October 3 and October 5 are the busiest days at Seoul Station and express bus terminals.
If your dates are fixed, book the moment your window opens; if they are flexible, traveling on October 4 avoids the two peak days.
What Is Gaecheonjeol, and What Happens Around October 3?
Gaecheonjeol commemorates the legendary founding of Gojoseon in 2333 BC and is one of Korea’s national holidays under the Official Holidays Act.
The national flag (Taegeukgi) is displayed widely on buildings and streets across the weekend.
The official national ceremony is traditionally held at Sejong Civic Center in Sejong City, with related rites in Seoul and Ganghwa.
Street festivals and founding-legend events around October 3 are common in past years, but specific 2026 events in Seoul have not been confirmed by an official notice yet.
If you want a ceremony or festival on your itinerary, check Seoul event notices in late September rather than assuming the usual program.
If I were planning this weekend, I would book KTX or intercity bus seats first, because holiday-cluster departures on Oct 3 and returns on Oct 5 sell out before anything else does.
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Sources
- Official holiday calendar: Gaecheonjeol 2026-10-03, substitu (data.go.kr)
- Holiday service follows weekend timetable (english.visitkorea.or.kr)
- Open on public holidays; Monday closure may apply Oct 5 (museum.go.kr)
How to Plan the Oct 3–5 Weekend
- Treat October 3 and 5 as no-bank, no-government-office days and keep those errands outside the weekend.
- Withdraw cash before October 3 — ATMs work, but branch counters do not.
- Book KTX or intercity bus seats as early as your booking window opens; October 3 and 5 sell out first.
- Reserve Secret Garden and other capped slots 1–4 weeks ahead.
- Save 1330 (Korea Travel Hotline) — it answers 24/7 in several languages on holidays.
FAQ
Q. When is the 2026 National Foundation Day holiday in Korea?
October 3, 2026 (Saturday), with a substitute holiday on Monday, October 5 — a 3-day weekend, per the official holiday calendar.
Q. Are banks and government offices closed on October 3, 2026?
Yes. Branches and government offices close on both October 3 and October 5, but ATMs and card payments work normally.
Q. Does the Seoul subway run on National Foundation Day?
Yes. Subway and city buses run on a weekend or holiday schedule, with later first trains and reduced frequency.
Q. When should I book KTX for the October 3–5 weekend?
Korail opens reservations about one month ahead — October 3 seats from around September 3 — and holiday seats sell out quickly.
Q. Are museums open on Monday, October 5, 2026?
National museums usually close Mondays, so October 5 may be closed unless the museum announces a special holiday opening — check the museum’s own notice.
Dates to watch: September 3 — KTX booking opens; October 3 (Sat) — holiday, peak outbound travel; October 5 (Mon) — substitute holiday, peak return travel.
Cover photo: Gwanghwamun Gate, Seoul, South Korea — CC0 1.0
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