City comparison · time difference and converter
Surat is 2.5 hours behind Singapore right now. Singapore sits in Singapore on Singapore; Surat sits in India on Kolkata. They are roughly 4,019 km apart (2,497 mi), a flight of about 5h 44m. Singapore's metro holds around 5.9 million people; Surat's around 4.6 million.
Slot 1
12:00 / 09:00
Singapore / Surat
Both inside business hoursSlot 2
13:00 / 10:00
Singapore / Surat
Both inside business hoursSlot 3
14:00 / 11:00
Singapore / Surat
Both inside business hoursEach row is one hour in Singapore. 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.
No public holidays in Singapore or India this month.
Great-circle distance
4,019 km
(2,497 mi)
Approximate flight
5h 44m
850 km/h cruise + 1h taxi/climb/descent
Jet lag
3h
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 Singapore and Surat is not really a number, it's a daily rhythm. Surat is 2.5 hours behind Singapore on the clock today, but the lived version is that Singapore is ahead in the calendar, so by the time Surat comes online, half of Singapore's day is already gone. That gap, more than the raw offset, is what teams have to design around.
In Singapore, the working day picks up earliest in the financial districts — CBD towers in Raffles Place light up by 08:00 and the lunch crowd hits 12:30 sharp. The mood in Surat is its own story: Surat 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. Singapore either observes DST or holds a fixed offset year-round; India either follows its region's DST pattern or stays put all year. When the two changes are weeks apart, the offset between Singapore and Surat 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 5h 44m 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 3-hour gap costs about 3 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.