Seoul to Upper Alton time converter

Upper Alton is 14 hours behind Seoul. When it is 9:00 AM in Seoul, it is 7:00 PM (Mon, Oct 19) in Upper Alton.

Seoul KST

Tuesday, October 20, 2026

Upper Alton CDT

Monday, October 19, 2026

Seoul
South Korea
Tue, Oct 20
KSTUTC+9
Upper Alton
Illinois, United States
Mon, Oct 19
CDTUTC-5-14h
Finding your time zone…
Shared working hours (9:00–18:00)

Seoul to Upper Alton conversion table

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

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

Best time to call or meet

Working hours don't overlap fully. The closest fit is 7:00 AM – 8:00 AM in Seoul (5:00 PM – 6:00 PM in Upper Alton): 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 Upper Alton switch clocks on different dates:

  • Oct 20, 2026 – Nov 1, 2026: -14h
  • Nov 1, 2026 – Mar 14, 2027: -15h
  • Mar 14, 2027 – Oct 20, 2027: -14h

Distance

Seoul and Upper Alton are 10,702 km (6,650 miles) apart in a straight line.

More conversions

Upper Alton to SeoulSeoul to New YorkSeoul to LondonSeoul to Los AngelesSeoul to ChicagoSeoul to TorontoSeoul to São PauloSeoul to ParisSeoul to BerlinSeoul to MoscowSeoul to DubaiSeoul to New DelhiSeoul to Bangkok
New York to Upper AltonLondon to Upper AltonLos Angeles to Upper AltonChicago to Upper AltonToronto to Upper AltonSão Paulo to Upper AltonParis to Upper AltonBerlin to Upper AltonMoscow to Upper AltonDubai to Upper AltonNew Delhi to Upper AltonBangkok to Upper Alton

Questions and answers

What is the time difference between Seoul and Upper Alton?

Upper Alton is 14 hours behind Seoul.

What time is it in Upper Alton when it is 9 AM in Seoul?

When it is 9:00 AM in Seoul, it is 7:00 PM (Mon, Oct 19) in Upper Alton.

When is the best time to call Upper Alton from Seoul?

Working hours don't overlap fully. The closest fit is 7:00 AM – 8:00 AM in Seoul (5:00 PM – 6:00 PM in Upper Alton): working hours on one side, early or late on the other.

Does the time difference between Seoul and Upper Alton change?

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