Seoul to Riyadh
-6hSeoul
KSTSOURCERiyadh
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
KST and AST on the World Map
The map below highlights the KST (Korea Standard Time) and AST (Arabia Standard Time) timezone regions across the globe.
KST – Korea Standard Time
UTC+09:00Korea Standard Time (KST) is the time zone for South Korea, 9 hours ahead of UTC.
- •South Korea does not observe daylight saving time.
- •Seoul is home to Samsung, LG, and Hyundai headquarters.
- •KST is the same offset as JST (UTC+09:00).
AST – Arabia Standard Time
UTC+03:00Arabia Standard Time (AST, UTC+03:00) is the time zone for Saudi Arabia and the other Gulf states of the Arabian peninsula.
- •None of the Gulf states on Arabia Standard Time observe daylight saving.
- •AST is the same offset as Moscow Standard Time and East Africa Time.
- •Riyadh is one hour ahead of Central European Time in winter.
- •The AST abbreviation is shared with Atlantic Standard Time (UTC-04:00).
About Seoul
WikipediaSeoul operates on Korea Standard Time (KST), UTC+9, same as Japan. As a global tech and entertainment hub, Seoul coordinates with East Asian markets.
Seoul has the fastest average internet speed in the world.
About Riyadh
WikipediaRiyadh operates on Arabia Standard Time (AST), UTC+3. As OPEC's de facto capital and home to Tadawul, Riyadh time impacts global energy markets.
Riyadh is growing rapidly as part of Saudi Vision 2030 modernization.
Seoul to Riyadh Time Difference – Complete Guide
Seoul runs on Korean Standard Time (KST) at UTC+09:00. Riyadh runs on Arabian Standard Time (AST) at UTC+03:00. That puts Seoul 6 hours behind Riyadh — a difference of -6h at the current offsets.
In practice, when it is 9:00 AM in Seoul it is 3:00 AM in Riyadh. Midnight in Seoul is 6:00 PM in Riyadh. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Seoul to Riyadh time conversion table
| Seoul (KST) | Riyadh (AST) | Day |
|---|---|---|
| 12:00 AM | 6:00 PM | previous day |
| 6:00 AM | 12:00 AM | same day |
| 7:00 AM | 1:00 AM | same day |
| 8:00 AM | 2:00 AM | same day |
| 9:00 AM | 3:00 AM | same day |
| 12:00 PM | 6:00 AM | same day |
| 3:00 PM | 9:00 AM | same day |
| 5:00 PM | 11:00 AM | same day |
| 6:00 PM | 12:00 PM | same day |
| 9:00 PM | 3:00 PM | same day |
Why people convert Seoul to Riyadh time
- Scheduling a call from Seoul to Riyadh: a 10:00 AM start in Seoul lands at 4:00 AM in Riyadh, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Seoul and Riyadh are inside the 9-to-5 working day between 3:00 PM and 5:00 PM KST time (9:00 AM–11:00 AM AST). That is roughly 2 hours of usable overlap.
- Watching a live event or market open: Seoul viewers need 3:00 AM in Riyadh to catch a 9:00 AM start there, and 6:00 AM if the event is anchored to Seoul.
- Always state the zone abbreviation, not just the hour. "3:00 PM KST" is unambiguous; "3 PM" across a -6h gap is not.
- Block 3:00 PM–5:00 PM KST as the recurring meeting window if you work primarily from Seoul and need Riyadh colleagues present.
About KST (Korea Standard Time)
Korea Standard Time (KST) is the time zone used in South Korea. It shares the same UTC offset as Japan Standard Time but is a distinct time zone. South Korea does not observe daylight saving time. Seoul, the capital, is a major global tech and business hub.
About AST (Arabia Standard Time)
Arabia Standard Time (AST) is fixed at UTC+03:00 all year across Saudi Arabia, Qatar, Kuwait, Bahrain, Iraq and Yemen. None of these countries observes daylight saving time, so the offset never changes. The abbreviation collides with Atlantic Standard Time (UTC-04:00) used in eastern Canada and the Caribbean; this page covers the Arabian peninsula meaning. Arabia Standard Time is the same offset as Moscow Standard Time and East Africa Time, which makes scheduling with Europe straightforward — Riyadh is one hour ahead of Central European Time in winter and level with it during European summer time.
Best time to call between Seoul and Riyadh
Both Seoul and Riyadh sit inside the 9 AM – 5 PM working day between 3:00 PM–5:00 PM KST, which is 9:00 AM–11:00 AM AST. That gives roughly 2 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Seoul and Riyadh overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.
Seoul is 6 hours behind Riyadh (KST UTC+09:00 → AST UTC+03:00). The shared working window is 3:00 PM–5:00 PM KST. Remember to re-check around daylight-saving transitions.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between Seoul and Riyadh?
Seoul (KST, UTC+09:00) is 6 hours behind Riyadh (AST, UTC+03:00). The gap is currently -6h.
How do I convert Seoul time to Riyadh time?
Add -6h to Seoul local time. For example, 9:00 AM in Seoul is 3:00 AM in Riyadh.
What time is it in Riyadh right now?
Riyadh uses AST at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -6h offset from Seoul.
What is the best time to call Riyadh from Seoul?
Call between 3:00 PM and 5:00 PM KST — that maps to 9:00 AM–11:00 AM AST and keeps both parties inside the working day.
Which is behind, Seoul or Riyadh?
Seoul is 6 hours behind Riyadh. When it is 12:00 PM in Seoul it is 6:00 AM in Riyadh.
Do Seoul and Riyadh use different time zones?
Seoul (South Korea) uses KST at UTC+09:00, while Riyadh (Saudi Arabia) uses AST at UTC+03:00. The IANA identifiers are Asia/Seoul and Asia/Riyadh.
Does daylight saving time affect the Seoul–Riyadh difference?
Neither zone observes daylight saving time, so the -6h offset between Seoul and Riyadh is fixed all year.
Which other cities share Seoul's time zone?
KST also covers Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
Which countries use KST, Seoul's zone?
KST is used in South Korea, North Korea.
Is there a day difference between Seoul and Riyadh?
Not normally. The -6h gap only pushes the date over the previous day.
What is the time difference between Seoul and Riyadh?
Riyadh is -6h from Seoul.
What timezone is Seoul in?
Seoul operates on Korea Standard Time (KST), UTC+9, same as Japan. As a global tech and entertainment hub, Seoul coordinates with East Asian markets.
What timezone is Riyadh in?
Riyadh operates on Arabia Standard Time (AST), UTC+3. As OPEC's de facto capital and home to Tadawul, Riyadh time impacts global energy markets.
What are the business hours in Seoul?
Standard business hours in Seoul are 9:00 AM - 6:00 PM KST.
What are the business hours in Riyadh?
Standard business hours in Riyadh are 8:00 AM - 4:00 PM AST (Sunday-Thursday).
What is the best time to schedule a call between Seoul and Riyadh?
The best overlap for a call is when both cities are in business hours. Seoul works 9:00 AM - 6:00 PM KST and Riyadh works 8:00 AM - 4:00 PM AST (Sunday-Thursday) (-6h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Seoul and Riyadh?
Seoul uses KRW (₩) while Riyadh uses SAR (﷼). Check current exchange rates when planning travel or business between these cities.
How do Seoul and Riyadh compare in size?
Seoul has a population of approximately 9.7 million (metro: 25.5 million), while Riyadh has approximately 7.7 million (metro: 7.7 million).
What are the major landmarks in Seoul and Riyadh?
Seoul is known for Gyeongbokgung Palace, N Seoul Tower, Bukchon Hanok Village. Riyadh is famous for Kingdom Centre, Masmak Fortress, National Museum.
Do Seoul and Riyadh have stock exchanges?
Yes. Seoul has the KRX (Korea Exchange) and Riyadh has the Tadawul (Saudi Stock Exchange). The -6h time difference affects trading hour overlaps between these exchanges.
Which countries use KST (Korea Standard Time)?
KST is used in South Korea, North Korea.
Does KST observe daylight saving time?
No, KST does not observe daylight saving time and remains at UTC+09:00 year-round.
What are some interesting facts about KST?
South Korea does not observe daylight saving time. Seoul is home to Samsung, LG, and Hyundai headquarters.
Which cities are in the AST timezone?
Major cities in the AST timezone include Riyadh, Jeddah, Doha, Kuwait City, Baghdad.
What is the UTC offset for AST?
Arabia Standard Time (AST) is at UTC+03:00.
What should I know about the AST timezone?
None of the Gulf states on Arabia Standard Time observe daylight saving. AST is the same offset as Moscow Standard Time and East Africa Time.
When is it midnight in Seoul, what time is it in Riyadh?
When it is 12:00 AM (midnight) in Seoul (KST), it is -6h later in Riyadh (AST).
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