Azerbaijan Airlines flight J2-8243 caught fire as it attempted to make an emergency landing near the Kazakh city of Aktau.
The plane was en route to Grozny in Russia but it was diverted due to fog, the airline told the BBC
Footage shows the aircraft heading towards the ground at high speed with its landing gear down, before bursting into flames as it lands.
The airline said the plane "made an emergency landing" about 3km (1.9 miles) from Aktau.
It took off from the Azerbaijani capital Baku at 03:55 GMT on Wednesday, and crashed around 06:28, data from flight-tracking website Flightradar24 showed.
Unconfirmed reports from Russian media said the aircraft might have collided with a flock of birds before crashing.
Azerbaijan Airlines said flights between Baku and the Russian cities of Grozny and Makhachkala would be cancelled while an investigation into the incident was completed.
A woman who was travelling to spend the holidays with her children in Chechnya, of which Grozny is the capital, died in the crash. One mother, travelling with medical tests for her sick child, is still missing.
A young woman shared her heartache with the BBC's Azerbaijani service as she desperately tried to find out what happened to her father, who was on the flight
She explained that her father had been travelling with his son, who survived the crash. The son managed to contact his sister, but there was still no news of their father.Dozens of people have died after a passenger plane crashed with about 70 people on board in Kazakhstan, local officials say.
Authorities in Azerbaijan, where the flight originated, say there were at least 30 survivors.
Azerbaijan Airlines flight J2-8243 caught fire as it attempted to make an emergency landing near the Kazakh city of Aktau.
The plane was en route to Grozny in Russia but it was diverted due to fog, the airline told the BBC.Footage shows the aircraft heading towards the ground at high speed with its landing gear down, before bursting into flames as it lands.
The airline said the plane "made an emergency landing" about 3km (1.9 miles) from Aktau.
It took off from the Azerbaijani capital Baku at 03:55 GMT on Wednesday, and crashed around 06:28, data from flight-tracking website Flightradar24 showed.
Reports from Russian media say the aircraft collided with a flock of birds before crashing, but this has not yet been confirmed.
Officials from the countries involved have stated different numbers for those who were on board and for those who survived.
The airline said 64 passengers and 5 crew members were on board the Embraer 190 but other reports put the total at 72. The reported number of survivors were 31.
Those on board were mostly Azerbaijani nationals, but there were also some passengers from Russia, Kazakhstan, and Kyrgyzstan.
The Embraer 190 caught fire and split apart as it landed
Ministry of Emergencies for the Republic of Kazakhstan Firefighters examining and looking through debris from a plane crash
Ministry of Emergencies for the Republic of Kazakhstan
Emergency services put out a fire at the wreckage
Unverified video footage showed survivors crawling out of the wreckage, some with visible injuries.
Both Azerbaijan and Kazakhstan have launched investigations into the accident. Embraer told the BBC it was "ready to assist all relevant authorities".
The BBC has contacted Azerbaijan Airlines for comment.
Embraer, a Brazilian manufacturer, is a smaller rival to Boeing and Airbus, and has a strong safety record.
A passenger plane has crashed with 67 people on board in Kazakhstan, local authorities say.
Preliminary reports suggest there are 25 survivors, 22 of whom have been taken to hospital, Kazakhstan's emergency ministry said.
The plane, operated by Azerbaijan Airlines, caught fire as it went down near the city of Aktau but the fire has since been put out, officials said.
It is not yet known what caused the crash.
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Air Crash