Spur 303 is a state highway between Interstate 820 in Fort Worth, and Duncanville Road in Dallas.

Spur 303 begins at an interchange at I-820 in Fort Worth and heads east as Rosedale Street.

It becomes Pioneer Parkway due north of Lake Arlington and remains so as it passes between Pantego and Dalworthington Gardens.

SH 161 runs on both sides of the toll road and gives Spur 303 limited access to the turnpike.

It becomes Kiest Boulevard as it intersects Mountain Creek Parkway and it passes by Dallas Baptist University before interchanging with Spur 408.