It really depends on the route you take. If you fly to KL with Iran air and then take a flight to Singapore, It would be around 9-10 hours total but flying to one of the Arab countries from tehran and then going to Singapore might take longer. However it all depends on the weather conditions etc. I have travelled the route quiet a few times never got there in less than 8:40 and the longest took me about 11 coming from s'pore to tehran.
A random search for flights from Paris (CDG) to Tehran Khomeini (IKA) shows:
OPTION 1: 7hr 05min via Vienna (VIE)
CDG - VIE Austrian Airlines Flt 7118 Dep 05:25pm 14May,Fri
Operated by Air France
VIE - IKA Austrian Airlines Flt 0871 Dep 08:10pm 14May,Fri
Flight Duration: 6hr 20min; Layover Time: 0hr 45min; Total Trip Time: 7hr 05min
OPTION 2: 8hr 05min via Istanbul Ataturk (IST)
CDG - IST THY Turkish Airlines Flt 1828 Dep 05:35pm 14May,Fri
IST - IKA THY Turkish Airlines Flt 0878 Dep 11:40pm 14May,Fri
Flight Duration: 6hr 30min; Layover Time: 1hr 35min; Total Trip Time: 8hr 05min
OPTION 3: 10hr 30min via Doha (DOH)
CDG - DOH Qatar Airways Flt 020 Dep 04:05pm 14May,Fri
DOH - IKA Qatar Airways Flt 484 Dep 01:40am 15May,Sat
Flight Duration: 8hr 30min; Layover Time: 2hr 00min; Total Trip Time: 10hr 30min
In this case, longer the trip time, cheaper the fare.
A random search from Tehran Khomeini (IKA) to Stockholm Arlanda (ARN) shows:
OPTION 1: 8hr 55min via Frankfurt (FRA)
IKA - FRA Lufthansa Flt 0601 Dep 03:10am 17Dec,Thu
FRA - ARN Lufthansa Flt 3000 Dep 07:30am 17Dec,Thu
Flight Duration: 7hr 30min; Layover Time: 1hr 25min; Total Trip Time: 8hr 55min
OPTION 2: 9hr 55min via Istanbul Ataturk (IST) (Cheaper Option)
IKA - IST THY Turkish Airlines Flt 1275 Dep 04:00am 17Dec,Thu
IST - ARN THY Turkish Airlines Flt 1793 Dep 08:50am 17Dec,Thu
Flight Duration: 7hr 00min; Layover Time: 2hr 55min; Total Trip Time: 9hr 55min
A random search for flights from Tehran Khomeini (IKA) to Kuala Lumpur (KUL) shows:
OPTION 1: 10hr 15min via Doha (DOH)
IKA - DOH Qatar Airways Flt 489 Dep 06:55pm 07May,Fri
DOH - KUL Qatar Airways Flt 620 Dep 08:20am 07May,Fri
Flight Duration: 9hr 15min; Layover Time: 1hr 00min; Total Trip Time: 10hr 15min
OPTION 2: 10hr 55min via Bahrain (BAH)
IKA - BAH Gulf Air Flt 335 Dep 06:50pm 07May,Fri
BAH - KUL Gulf Air Flt 280 Dep 08:40pm 07May,Fri
Flight Duration: 9hr 35min; Layover Time: 1hr 20min; Total Trip Time: 10hr 55min
8 hours.
No flight itinerary is available from China to Cuba.
The flight will take approximately 18 hours.
Approximately 14 hours.
The flight time from Tehran, Iran to Australia is 14 hours and 11 minutes.
It will take about 13 hours and 30 minutes.
about four hours
The flight time from Shanghai, China to Wuhan, China is approximately 50 minutes.
The flight time from Tehran, Iran to Adelaide, Australia is 15 hours, 21 minutes.
about 14 hours ?
1 second
19 hours