Experts advise that if you haven't left yet, wait until after 8 p.m. to avoid heavy traffic.
AAA says July 4 travel has been record-setting this year between June 29 and July 7.
It estimates nearly 3 million more people are on the roads this year compared to last year.
When it comes to flying, records were also expected to be set as nearly 6 million passengers flew to and from their holiday destinations. That's nearly 7% more than last year, AAA says.
American Airlines said on Sunday, the airline will carry the most customers in their history and it will be the busiest day of the summer.
The airline flew over 775,000 customers on Sunday alone, according to officials.
For those leaving from the Philadelphia International Airport, flights appeared to be on time with a few exceptions, such as international flights.
One couple flying in from Montreal, Canada, spoke with Action News.
"It was just fine, no delays. Everything went smoothly. Going out we were delayed though, so we're happy about today," said Jenna Duerr from Center City.
"We had some poutine. It was a lot of fun, but we're ready to have a cheesesteak now," added Caleb Hazelwood from Center City.
Others said their flights were a breeze. One California father and daughter duo weren't in town for the Fourth, but still took in Philadelphia's patriotic history.
"We went and visited today the Liberty Bell, Independence Halls, the whole downtown area. Really liked it, very good food too," said Mohan Hegde from San Francisco, California.