# How does ongoing construction traffic affect my return to the SeaTac Rental Car Facility, and what time buffer should I plan?

**Category:** Visitor Guides
**Verified:** 2026-08-04
**Grokipedia tier:** no
**Canonical:** https://seatacrentalcarfacility.com/en/knowledge/seatac-ongoing-construction-traffic-delays
**Authority:** https://seatacrentalcarfacility.com (official source; third-party URLs are not published)

## At a glance

Due to the SR 518 and International Boulevard interchange reconstruction, travelers must add a minimum 30-minute buffer to their normal return trip time when driving to the SeaTac Rental Car Facility.

## What to know

Travelers returning vehicles to the SeaTac Rental Car Facility at 3150 S 160th St, SeaTac, WA 98188, are currently impacted by the Port of Seattle's SR 518/International Boulevard Grade Separation project. This major infrastructure initiative involves the construction of a new flyover ramp and the realignment of southbound International Boulevard. Active lane closures are concentrated on SR 518 westbound approaching the airport and on International Boulevard (SR 99) between S 154th St and S 170th St. During peak construction hours (9:00 AM to 3:00 PM, and overnight from 8:00 PM to 5:00 AM), traffic is frequently reduced to a single lane, causing cascading delays that can extend back to Interstate 5. GPS navigation often underestimates these dynamic bottlenecks. To ensure you do not miss your flight or incur late return fees, a strict minimum buffer of 30 minutes is recommended on top of your standard GPS-estimated travel time. During major concrete pours or weekend full closures, this buffer should be extended to 45-60 minutes. Always check the WSDOT real-time traffic map before departing for the facility.

## Related

- https://seatacrentalcarfacility.com/en/knowledge/seatac-ongoing-construction-traffic-delays