After ISIS became a threat, a lot of airlines stopped flying over Iraq and routed over western Iran instead. It now appears that, other then local traffic, flights are starting to travel north over the Caspian and Black Seas or south over Saudi Arabia and Egypt.
Actually it depends - on the type of missile fired by the Iranians. S300's (and S400's if they have/get them) are launched to altitude in the area of an identified hostile target and then go into a hunter/killer mode - given that the missile might not be able to detect the stealth F35/B2 etc that it was being sent after it could easily lock onto an airliner. Given that an aircraft over Dubai is within range of an S300 launched from the Iranian coast it makes the entire area risky to fly through, and that's before you even take into account things like the U.S. Navy has even been known to shoot down their own aircraft during peacetime exercises. Basically you would want to be giving the entire area a wide berth - either south flying up the Red Sea or north of the Himalayas as JB747 suggested
...and that Iran has BUK's as well...as does Syria - who even managed to shoot down a plane belonging to their Russian guests so its obvious that they don't give two BUK's what they shoot down!
Iran have now admitted to "Unintentionally" shooting the aircraft down.
Iran Says It Unintentionally Shot Down Ukrainian Airliner (Published 2020)
“The Islamic Republic of Iran deeply regrets this disastrous mistake,” President Hassan Rouhani said, as Iran reversed its claims that mechanical failure was to blame.www.nytimes.com
onemileatatime.com
