Riyadh to Seoul
+6hRiyadh
ASTSOURCESeoul
KSTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and KST on the World Map
The map below highlights the AST (Arabia Standard Time) and KST (Korea Standard Time) timezone regions across the globe.
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).
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).
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.
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.
Riyadh to Seoul Time Difference – Complete Guide
Riyadh runs on Arabian Standard Time (AST) at UTC+03:00. Seoul runs on Korean Standard Time (KST) at UTC+09:00. That puts Riyadh 6 hours ahead of Seoul — a difference of +6h at the current offsets.
In practice, when it is 9:00 AM in Riyadh it is 3:00 PM in Seoul. Midnight in Riyadh is 6:00 AM in Seoul. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Riyadh to Seoul time conversion table
| Riyadh (AST) | Seoul (KST) | Day |
|---|---|---|
| 12:00 AM | 6:00 AM | same day |
| 6:00 AM | 12:00 PM | same day |
| 7:00 AM | 1:00 PM | same day |
| 8:00 AM | 2:00 PM | same day |
| 9:00 AM | 3:00 PM | same day |
| 12:00 PM | 6:00 PM | same day |
| 3:00 PM | 9:00 PM | same day |
| 5:00 PM | 11:00 PM | same day |
| 6:00 PM | 12:00 AM | next day |
| 9:00 PM | 3:00 AM | next day |
Why people convert Riyadh to Seoul time
- Scheduling a call from Riyadh to Seoul: a 10:00 AM start in Riyadh lands at 4:00 PM in Seoul, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Riyadh and Seoul are inside the 9-to-5 working day between 9:00 AM and 11:00 AM AST time (3:00 PM–5:00 PM KST). That is roughly 2 hours of usable overlap.
- Booking travel or deliveries: tracking Seoul local time against Riyadh keeps pickup windows and arrival estimates honest across the +6h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +6h gap is not.
- Block 9:00 AM–11:00 AM AST as the recurring meeting window if you work primarily from Riyadh and need Seoul colleagues present.
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.
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.
Best time to call between Riyadh and Seoul
Both Riyadh and Seoul sit inside the 9 AM – 5 PM working day between 9:00 AM–11:00 AM AST, which is 3:00 PM–5:00 PM KST. That gives roughly 2 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Riyadh and Seoul overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.
Riyadh is 6 hours ahead of Seoul (AST UTC+03:00 → KST UTC+09:00). The shared working window is 9:00 AM–11:00 AM AST. 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 Riyadh and Seoul?
Riyadh (AST, UTC+03:00) is 6 hours ahead of Seoul (KST, UTC+09:00). The gap is currently +6h.
How do I convert Riyadh time to Seoul time?
Add +6h to Riyadh local time. For example, 9:00 AM in Riyadh is 3:00 PM in Seoul.
What time is it in Seoul right now?
Seoul uses KST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +6h offset from Riyadh.
What is the best time to call Seoul from Riyadh?
Call between 9:00 AM and 11:00 AM AST — that maps to 3:00 PM–5:00 PM KST and keeps both parties inside the working day.
Which is ahead, Riyadh or Seoul?
Riyadh is 6 hours ahead of Seoul. When it is 12:00 PM in Riyadh it is 6:00 PM in Seoul.
Do Riyadh and Seoul use different time zones?
Riyadh (Saudi Arabia) uses AST at UTC+03:00, while Seoul (South Korea) uses KST at UTC+09:00. The IANA identifiers are Asia/Riyadh and Asia/Seoul.
Does daylight saving time affect the Riyadh–Seoul difference?
Neither zone observes daylight saving time, so the +6h offset between Riyadh and Seoul is fixed all year.
Which other cities share Riyadh's time zone?
AST also covers Riyadh, Jeddah, Doha, Kuwait City, Baghdad.
Which countries use AST, Riyadh's zone?
AST is used in Saudi Arabia, Qatar, Kuwait, Bahrain, Iraq, Yemen.
Is there a day difference between Riyadh and Seoul?
Not normally. The +6h gap only pushes the date over for late-evening times.
What is the time difference between Riyadh and Seoul?
Seoul is +6h from Riyadh.
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 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 are the business hours in Riyadh?
Standard business hours in Riyadh are 8:00 AM - 4:00 PM AST (Sunday-Thursday).
What are the business hours in Seoul?
Standard business hours in Seoul are 9:00 AM - 6:00 PM KST.
What is the best time to schedule a call between Riyadh and Seoul?
The best overlap for a call is when both cities are in business hours. Riyadh works 8:00 AM - 4:00 PM AST (Sunday-Thursday) and Seoul works 9:00 AM - 6:00 PM KST (+6h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Riyadh and Seoul?
Riyadh uses SAR (﷼) while Seoul uses KRW (₩). Check current exchange rates when planning travel or business between these cities.
How do Riyadh and Seoul compare in size?
Riyadh has a population of approximately 7.7 million (metro: 7.7 million), while Seoul has approximately 9.7 million (metro: 25.5 million).
What are the major landmarks in Riyadh and Seoul?
Riyadh is known for Kingdom Centre, Masmak Fortress, National Museum. Seoul is famous for Gyeongbokgung Palace, N Seoul Tower, Bukchon Hanok Village.
Do Riyadh and Seoul have stock exchanges?
Yes. Riyadh has the Tadawul (Saudi Stock Exchange) and Seoul has the KRX (Korea Exchange). The +6h time difference affects trading hour overlaps between these exchanges.
Which countries use AST (Arabia Standard Time)?
AST is used in Saudi Arabia, Qatar, Kuwait, Bahrain, Iraq, Yemen.
Does AST observe daylight saving time?
No, AST does not observe daylight saving time and remains at UTC+03:00 year-round.
What are some interesting facts about AST?
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.
Which cities are in the KST timezone?
Major cities in the KST timezone include Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
What is the UTC offset for KST?
Korea Standard Time (KST) is at UTC+09:00.
What should I know about the KST timezone?
South Korea does not observe daylight saving time. Seoul is home to Samsung, LG, and Hyundai headquarters.
When is it midnight in Riyadh, what time is it in Seoul?
When it is 12:00 AM (midnight) in Riyadh (AST), it is +6h later in Seoul (KST).
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