The best time to call Singapore from Tulsa is 9 AM–11 AM your time (Tulsa). Singapore, Singapore is 11 hours behind Tulsa, USA. There is no standard business hours overlap, so one party will need to adjust their schedule.
Call between 9 AM–11 AM Tulsa time.
Tulsa and Singapore have no overlapping standard business hours. One party will need to adjust.
The best time to call Singapore from Tulsa is 9 AM–11 AM Tulsa time. There is no standard business hours overlap between these cities.
Singapore is 11 hours behind Tulsa.
Avoid calling after 9 AM your time (it's late night there). Consider email or async communication for non-urgent matters.
No, Tulsa and Singapore do not have overlapping standard business hours (9 AM – 5 PM). You will need to schedule calls outside normal hours for one party.
No business hours overlap. You'll need to call outside standard hours — 9 AM–11 AM your time is the least disruptive window.
Both in business hours Both awake One outside comfort zone Sleeping hours
No standard business hours overlap (9 AM – 5 PM) between Tulsa and Singapore.
One party will need to adjust their schedule for calls.
| Tulsa (CDT) | Singapore (GMT+8) | Status |
|---|---|---|
| 7 AM | 8 PM | 🟡 They're awake |
| 8 AM | 9 PM | 🟡 They're awake |
| 9 AM | 10 PM | 🔴 They're sleeping |
| 10 AM | 11 PM | 🔴 They're sleeping |
| 11 AM | 12 AM | 🔴 They're sleeping |
| 12 PM | 1 AM | 🔴 They're sleeping |
| 1 PM | 2 AM | 🔴 They're sleeping |
| 2 PM | 3 AM | 🔴 They're sleeping |
| 3 PM | 4 AM | 🔴 They're sleeping |
| 4 PM | 5 AM | 🔴 They're sleeping |
| 5 PM | 6 AM | 🔴 They're sleeping |
| 6 PM | 7 AM | 🟡 They're awake |
| 7 PM | 8 AM | 🟡 They're awake |
| 8 PM | 9 AM | 🟡 They're awake |
| 9 PM | 10 AM | 🟡 They're awake |