How do I drive from Interstate 5, State Route 509, State Route 518, or Interstate 405 to return a rental car at the SeaTac Rental Car Facility?

The consolidated SeaTac Rental Car Facility (CONRAC) at 3150 S. , SeaTac, WA 98188 serves all 12 on-airport rental brands in a single 23-acre complex that has operated 24/7 since opening in May 2021. Do not drive to the passenger terminal to return your vehicle—follow purple-and-blue "Rental Car Return" signage from the freeways instead. From Interstate 5 northbound (Tacoma and points south): As you approach Tukwila, move into the right lanes and take Exit 154A for SR 518 West toward Burien and Sea-Tac Airport. On westbound SR 518, stay in the right through-lanes following Sea-Tac Airport signs. Use the far-right exit lane marked for SR 99 South / Rental Car Return. Remain in the right lane on International Boulevard (Pacific Highway S / SR 99 South) and follow the blue Rental Car Return sign into the right-hand facility entrance. From Interstate 5 southbound (Seattle and points north): Take Exit 154B for SR 518 West, then follow the identical lane sequence described above. From Interstate 405 southbound (Bellevue and the Eastside): I-405 south becomes SR 518 west at the I-5 cloverstack interchange in Tukwila. Continue west on SR 518 in the right lanes, then take the same far-right SR 99 South / Rental Car Return exit and right-lane approach to the right-hand entrance. From State Route 509 southbound (Seattle / Burien via the First Avenue South Bridge): Follow SR 509 south and take the SR 518 exit toward Burien/Sea-Tac Airport. Take the Sea-Tac Airport exit, then the Air Cargo Road exit. Turn right on S 170th St. , right on Air Cargo Rd. , and right on S 160th St. Follow Rental Car Return signs to the left-hand entrance—this is the only approach that uses the left entrance. Inside the facility, follow overhead agency signs to your brand's return lane. Peak freeway delays on I-5 and SR 518 commonly occur from 7–9 AM and 4–7 PM; allow extra buffer time during those windows. After drop-off, free 24/7 shuttles reach the terminal in about 5 minutes.