Costa Mesa to Seoul time converter

Seoul is 16 hours ahead of Costa Mesa. When it is 9:00 AM in Costa Mesa, it is 1:00 AM (Wed, Oct 21) in Seoul.

Costa Mesa PDT

Tuesday, October 20, 2026

Seoul KST

Tuesday, October 20, 2026

Costa Mesa
California, United States
Tue, Oct 20
PDTUTC-7
Seoul
South Korea
Tue, Oct 20
KSTUTC+9+16h
Finding your time zone…
Shared working hours (9:00–18:00)

Costa Mesa to Seoul conversion table

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

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

Best time to call or meet

Both sides are at work from 5:00 PM – 6:00 PM in Costa Mesa (9:00 AM – 10:00 AM in Seoul).

Daylight saving time and the difference

The difference changes during the year because Costa Mesa and Seoul switch clocks on different dates:

  • Oct 20, 2026 – Nov 1, 2026: +16h
  • Nov 1, 2026 – Mar 14, 2027: +17h
  • Mar 14, 2027 – Oct 20, 2027: +16h

Distance

Costa Mesa and Seoul are 9,639 km (5,989 miles) apart in a straight line.

More conversions

Seoul to Costa MesaCosta Mesa to New YorkCosta Mesa to LondonCosta Mesa to Los AngelesCosta Mesa to ChicagoCosta Mesa to TorontoCosta Mesa to São PauloCosta Mesa to ParisCosta Mesa to BerlinCosta Mesa to MoscowCosta Mesa to DubaiCosta Mesa to New DelhiCosta Mesa to Bangkok
New York to SeoulLondon to SeoulLos Angeles to SeoulChicago to SeoulToronto to SeoulSão Paulo to SeoulParis to SeoulBerlin to SeoulMoscow to SeoulDubai to SeoulNew Delhi to SeoulBangkok to Seoul

Questions and answers

What is the time difference between Costa Mesa and Seoul?

Seoul is 16 hours ahead of Costa Mesa.

What time is it in Seoul when it is 9 AM in Costa Mesa?

When it is 9:00 AM in Costa Mesa, it is 1:00 AM (Wed, Oct 21) in Seoul.

When is the best time to call Seoul from Costa Mesa?

Both sides are at work from 5:00 PM – 6:00 PM in Costa Mesa (9:00 AM – 10:00 AM in Seoul).

Does the time difference between Costa Mesa and Seoul change?

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