Reportedly, flights will be operated once a week on Sundays on Boeing-737 800 aircraft.
"Departure from Saratov is scheduled for 18:00 (GMT+4 for each direction), arrival in Baku - at 20:20.
Russian media outlets earlier reported on plans to increase the number of flights from a number of countries, including Azerbaijan, from June 28.
S7 Airlines is the largest private airline in Russia, based in Domodedovo airport (Moscow) and Tolmachevo airport (Novosibirsk). It has the most modern fleet in the Russian air transit market. The extensive network of routes allows passengers to travel to 181 cities in 26 countries across the world.