Hundreds of supporters lined the street leading up to the Gazprom Arena in the Russian city to release flares as their team passed.
— ФК «Зенит»🌊 (@zenit_spb) February 21, 2019
From the street, the flare salute gave the landscape a red tinge, leading one fan to comment: "Welcome to hell."
The display preceded Zenit's 3-1 victory over Fenerbahce in Saint Petersburg on Thursday night.
An early goal from Magomed Ozdoyev and a brace from Sardar Azmoun saw the club to a 3-2 aggregate victory and into the Europa League round of 16.
Zenit and 15 other teams will discover their opponents in the next round of the Uefa competition in Friday's draw.