Seoul to Istanbul
-6hSeoul
KSTSOURCEIstanbul
TRTGreen rows indicate typical business hours (9 AM - 5 PM)
KST and TRT on the World Map
The map below highlights the KST (Korea Standard Time) and TRT (Turkey 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).
TRT – Turkey Time
UTC+03:00Turkey Time (TRT, UTC+03:00) is the single time zone used across Turkey, fixed year round since 2016.
- •Turkey has used a permanent UTC+03:00 since September 2016.
- •TRT is level with Moscow Standard Time and Arabia Standard Time all year.
- •Because Turkey kept summer time permanently, western cities see very late winter sunrises.
- •Turkey previously observed daylight saving time from 1973 to 2016.
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 Istanbul
WikipediaIstanbul operates on Turkey Time (TRT), UTC+3 year-round. As a transcontinental city, Istanbul bridges European and Asian business hours.
The Grand Bazaar is one of the world's oldest and largest covered markets with 4,000+ shops.
Seoul vs Istanbul: Offsets, DST and Best Call Times
Seoul runs on Korean Standard Time (KST) at UTC+09:00. Istanbul runs on Türkiye Standard Time (TRT) at UTC+03:00. That puts Seoul 6 hours behind Istanbul — a difference of -6h at the current offsets.
In practice, when it is 9:00 AM in Seoul it is 3:00 AM in Istanbul. Midnight in Seoul is 6:00 PM in Istanbul. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Seoul to Istanbul time conversion table
| Seoul (KST) | Istanbul (TRT) | 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 Istanbul time
- Scheduling a call from Seoul to Istanbul: a 10:00 AM start in Seoul lands at 4:00 AM in Istanbul, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Seoul and Istanbul are inside the 9-to-5 working day between 3:00 PM and 5:00 PM KST time (9:00 AM–11:00 AM TRT). That is roughly 2 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in Seoul is 2:00 PM in Istanbul makes it easy to avoid calling at 3 AM.
- 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 Istanbul 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 TRT (Turkey Time)
Turkey Time (TRT) is fixed at UTC+03:00 all year. Turkey abolished seasonal clock changes in September 2016, moving to a permanent UTC+03:00 so the whole country stays on what was formerly summer time. That leaves Istanbul, which sits close to 29°E, on an offset well ahead of its solar time — sunrise in mid-winter comes after 08:30 local. TRT shares its offset with Moscow Standard Time, Arabia Standard Time and East Africa Time, so Istanbul is level with Moscow and Riyadh all year and one hour ahead of Central European Time during the European winter.
Best time to call between Seoul and Istanbul
Both Seoul and Istanbul 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 TRT. That gives roughly 2 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Seoul and Istanbul 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 Istanbul (KST UTC+09:00 → TRT 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 Istanbul?
Seoul (KST, UTC+09:00) is 6 hours behind Istanbul (TRT, UTC+03:00). The gap is currently -6h.
How do I convert Seoul time to Istanbul time?
Add -6h to Seoul local time. For example, 9:00 AM in Seoul is 3:00 AM in Istanbul.
What time is it in Istanbul right now?
Istanbul uses TRT 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 Istanbul from Seoul?
Call between 3:00 PM and 5:00 PM KST — that maps to 9:00 AM–11:00 AM TRT and keeps both parties inside the working day.
Which is behind, Seoul or Istanbul?
Seoul is 6 hours behind Istanbul. When it is 12:00 PM in Seoul it is 6:00 AM in Istanbul.
Do Seoul and Istanbul use different time zones?
Seoul (South Korea) uses KST at UTC+09:00, while Istanbul (Turkey) uses TRT at UTC+03:00. The IANA identifiers are Asia/Seoul and Europe/Istanbul.
Does daylight saving time affect the Seoul–Istanbul difference?
Neither zone observes daylight saving time, so the -6h offset between Seoul and Istanbul 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 Istanbul?
Not normally. The -6h gap only pushes the date over the previous day.
What is the time difference between Seoul and Istanbul?
Istanbul 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 Istanbul in?
Istanbul operates on Turkey Time (TRT), UTC+3 year-round. As a transcontinental city, Istanbul bridges European and Asian business hours.
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 Istanbul?
Standard business hours in Istanbul are 9:00 AM - 6:00 PM TRT.
What is the best time to schedule a call between Seoul and Istanbul?
The best overlap for a call is when both cities are in business hours. Seoul works 9:00 AM - 6:00 PM KST and Istanbul works 9:00 AM - 6:00 PM TRT (-6h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Seoul and Istanbul?
Seoul uses KRW (₩) while Istanbul uses TRY (₺). Check current exchange rates when planning travel or business between these cities.
How do Seoul and Istanbul compare in size?
Seoul has a population of approximately 9.7 million (metro: 25.5 million), while Istanbul has approximately 15.5 million (metro: 15.8 million).
What are the major landmarks in Seoul and Istanbul?
Seoul is known for Gyeongbokgung Palace, N Seoul Tower, Bukchon Hanok Village. Istanbul is famous for Hagia Sophia, Blue Mosque, Topkapi Palace.
Do Seoul and Istanbul have stock exchanges?
Yes. Seoul has the KRX (Korea Exchange) and Istanbul has the Borsa Istanbul. 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 TRT timezone?
Major cities in the TRT timezone include Istanbul, Ankara, Izmir, Bursa, Antalya.
What is the UTC offset for TRT?
Turkey Time (TRT) is at UTC+03:00.
What should I know about the TRT timezone?
Turkey has used a permanent UTC+03:00 since September 2016. TRT is level with Moscow Standard Time and Arabia Standard Time all year.
When is it midnight in Seoul, what time is it in Istanbul?
When it is 12:00 AM (midnight) in Seoul (KST), it is -6h later in Istanbul (TRT).
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