San Francisco has become the first city in the United States to breach an average of $5 a gallon, according to an industry expert as the Russia-Ukraine conflict juices oil prices, which topped $113 in trading Thursday.

"It's been quite ugly as gas prices rise nationally, but nowhere has the pain been more significant than California, where prices have breached the $5 gallon mark," Patrick De Haan, head of petroleum analysis for GasBuddy, told FOX Business Thursday.

Currently, the state average for a gallon of regular gasoline in California is $4.940, according to AAA. It's a significant leap from the national average of about $3.728, according to AAA data.

De Haan wanred that prices "will continue to head north" and could even reach $5.35 per gallon by the end of March. ... Read More: FOX Business