City comparison · time difference and converter
Toronto is 13 hours behind Seoul right now. Seoul sits in South Korea on Seoul; Toronto sits in Canada on Toronto. They are roughly 10,601 km apart (6,587 mi), a flight of about 13h 28m. Seoul's metro holds around 25.7 million people; Toronto's around 6.4 million.
Slot 1
00:00 / 11:00
Seoul / Toronto
Partial overlapSlot 2
01:00 / 12:00
Seoul / Toronto
Partial overlapSlot 3
02:00 / 13:00
Seoul / Toronto
Partial overlapEach row is one hour in Seoul. Green rows are inside business hours in both cities; amber means only one side is at their desk; grey rows fall outside business hours in both.
Local Election Day
Seoul, South Korea · 지방 선거일
Wed, Jun 3
Memorial Day
Seoul, South Korea · 현충일
Sat, Jun 6
Great-circle distance
10,601 km
(6,587 mi)
Approximate flight
13h 28m
850 km/h cruise + 1h taxi/climb/descent
Jet lag
13h
Roughly 1 day to adjust per timezone crossed
The heatmap gives you the shape of the day. If you need to convert one specific hour — say a customer call or a release window — open the converter with both cities already loaded.
Open in converter →The difference between Seoul and Toronto is not really a number, it's a daily rhythm. Toronto is 13 hours behind Seoul on the clock today, but the lived version is that Seoul is ahead in the calendar, so by the time Toronto comes online, half of Seoul's day is already gone. That gap, more than the raw offset, is what teams have to design around.
In Seoul, the working day picks up earliest in the financial districts — Seoul's downtown core wakes early and breaks for lunch at the usual hour. The mood in Toronto is its own story: Toronto settles into the evening at the usual hour, with the local commuter pattern setting the pace. If you are scheduling between the two, the heatmap above marks the rows where both patterns line up.
Daylight saving is the other thing to keep an eye on. South Korea either observes DST or holds a fixed offset year-round; Canada either follows its region's DST pattern or stays put all year. When the two changes are weeks apart, the offset between Seoul and Toronto is one hour off the usual for that stretch — a cliff that catches recurring calendar invites unless your calendar app rebases them automatically. Pin the meeting to a city, not an offset, and the tool handles the rest.
For travellers, the 13h 28m flight is the short version of the story. The longer one is jet lag: roughly one day of adjustment per timezone crossed, which means a trip across the 13-hour gap costs about 13 groggy days on each side. Pilots and cabin crew swear by morning sunlight and an early walk; whatever your routine, the wall-clock numbers above are the source of truth for your first morning in the new city.