Seoul to Great Falls time converter

Great Falls is 15 hours behind Seoul. When it is 9:00 AM in Seoul, it is 6:00 PM (Wed, Oct 21) in Great Falls.

Seoul KST

Thursday, October 22, 2026

Great Falls MDT

Wednesday, October 21, 2026

Seoul
South Korea
Thu, Oct 22
KSTUTC+9
Great Falls
Montana, United States
Wed, Oct 21
MDTUTC-6-15h
Finding your time zone…
Shared working hours (9:00–18:00)

Seoul to Great Falls conversion table

Every hour of today in Seoul and the matching time in Great Falls. Light rows are typical working hours (9:00–18:00).

SeoulGreat Falls
12:00 AM9:00 AM−1 day
1:00 AM10:00 AM−1 day
2:00 AM11:00 AM−1 day
3:00 AM12:00 PM−1 day
4:00 AM1:00 PM−1 day
5:00 AM2:00 PM−1 day
6:00 AM3:00 PM−1 day
7:00 AM4:00 PM−1 day
8:00 AM5:00 PM−1 day
9:00 AM6:00 PM−1 day
10:00 AM7:00 PM−1 day
11:00 AM8:00 PM−1 day
12:00 PM9:00 PM−1 day
1:00 PM10:00 PM−1 day
2:00 PM11:00 PM−1 day
3:00 PM12:00 AM
4:00 PM1:00 AM
5:00 PM2:00 AM
6:00 PM3:00 AM
7:00 PM4:00 AM
8:00 PM5:00 AM
9:00 PM6:00 AM
10:00 PM7:00 AM
11:00 PM8:00 AM

Best time to call or meet

Working hours don't overlap fully. The closest fit is 7:00 AM – 9:00 AM in Seoul (4:00 PM – 6:00 PM in Great Falls): working hours on one side, early or late on the other.

Daylight saving time and the difference

The difference changes during the year because Seoul and Great Falls switch clocks on different dates:

  • Oct 22, 2026 – Nov 1, 2026: -15h
  • Nov 1, 2026 – Mar 14, 2027: -16h
  • Mar 14, 2027 – Oct 22, 2027: -15h

Distance

Seoul and Great Falls are 8,932 km (5,550 miles) apart in a straight line.

More conversions

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Questions and answers

What is the time difference between Seoul and Great Falls?

Great Falls is 15 hours behind Seoul.

What time is it in Great Falls when it is 9 AM in Seoul?

When it is 9:00 AM in Seoul, it is 6:00 PM (Wed, Oct 21) in Great Falls.

When is the best time to call Great Falls from Seoul?

Working hours don't overlap fully. The closest fit is 7:00 AM – 9:00 AM in Seoul (4:00 PM – 6:00 PM in Great Falls): working hours on one side, early or late on the other.

Does the time difference between Seoul and Great Falls change?

Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.