At the intersection of Township Line and State roads in Drexel Hill, gas was selling for $4.39 per gallon at Wawa and Speedway, while a nearby Sunoco station was charging $4.24 per gallon.
All three prices were above Pennsylvania's statewide average and about a dollar higher than a year ago.
Workers at a Wawa in Glassboro, New Jersey, said gas prices increased 28 cents overnight.
The higher prices are already affecting travelers.
Zeeshan Parupia of Dallas, Texas, said he was surprised by the cost of fuel after stopping at a Royal Farms in Ridley Park while driving a rental car.
"I think right now it's like 70 cents more per gallon," Parupia said.
According to AAA, the average price of gas in Pennsylvania is $4.21 per gallon, which is 95 cents higher than the same time last year.
"This is the most expensive August for gas prices in history," said Jana Tidwell of AAA.
AAA said several factors are contributing to higher prices, including the ongoing conflict in the Middle East. Despite the increase, the organization expects many travelers to move forward with their Labor Day weekend plans.
"It's no secret the prices are less expensive in New Jersey, in Delaware, than they are in Pennsylvania. So if that's where you're headed this holiday weekend, make sure you fill up over there," Tidwell said.
Some drivers are seeking out lower-priced stations.
Paul Pro of Wallingford said he recently found gas selling for $4 per gallon at a Freedom Fuel station in Brookhaven.
"It's $50 to fill up this car. It's ridiculous, but what are you going to do," Pro said.
Freedom Fuel has also been involved in a legal dispute. A fuel supplier filed a lawsuit alleging it had not been paid for fuel delivered during the summer. An attorney for Freedom Fuel's parent company disputed the claim, calling the issue accounting errors on invoices. The company won a motion Friday allowing it to continue selling gas for now.
Even with prices fluctuating, drivers said they will continue looking for the best deal.
"Gas is gas. You're going to pay it no matter what, so you're going to go whatever is cheaper," Pro said.
AAA recommends motorists looking to maximize fuel efficiency keep unnecessary weight out of their vehicles and stay current on oil changes and routine maintenance.