© RIA Novosti / Igor Russak
Pulkovo, servicing the northern 'capital', received a phone call about a bomb in the airport, press secretary Anna Fedoseeva told RT.
Meanwhile, the airport's virtual flight board on its website is showing no changes in the airport's operations.
Moscow's southern Domodedovo Airport received a similar call saying that an explosion is being prepared in Terminal B. However, there is no such terminal at Domodedovo.
The airport is operating and no evacuation will be carried out, the organization's press service told RT.
Police are trying to establish the identity of the callers.
In May, there were two anonymous calls regarding an alleged impending explosion at Pulkovo. Both times the airport was evacuated, but fortunately no explosions followed.
St. Petersburg's Pulkovo is the third busiest airport in Russia after Moscow's Domodedovo and Sheremetyevo Airports.
Calls with fake bomb threats became much more common in Russia after the Domodedovo Airport suicide bombing on January 24, 2011, which killed at least 37 people and injured 180 more.
The attacker was later identified as Magomed Yevloyev, a 20-year-old from the North Caucasus, a member of the faction of the Caucasus Emirate led by terrorist Doku Umarov. The attack was aimed"first and foremost" at foreign citizens, the group said.
At least seven foreigners were killed in the bombing, one person each from Britain, Germany, Austria, Ukraine, Tajikistan, Kyrgyzstan and Uzbekistan.
Since that incident a complete security check has been introduced for those entering Domodedovo Airport and the number of officers working with sniffer dogs and police staff has been increased.
As the correspondent of radio "FM Messages" in Petersburg reported, the call about the put bomb arrived in the Pulkovo airport call-center around 12:30 from the territory of Ukraine. The man told that planes which land or fly up in Pulkovo, will get off from grenade launchers. After a call the operator at once contacted police. Evacuation began.