Interstate 380 California

Interstate 380 California
San Bruno, CA ↔ N Access Road – South San Francisco, CA•3.30 miles

Overview

Interstate 380 is a busy connector linking I-280 at San Bruno with U.S. 101 (Bayshore Freeway) at South San Francisco and San Francisco International Airport (SFO). I-380 constitutes a six lane freeway with auxiliary lanes added between entrance and exit ramps.

Ramps at San Francisco International Airport (SFO) were upgraded in the early 2000s as part of an expansion project that included a new terminal. An extension of the Bay Area Rapid Transit (BART) system, which commingles with the I-380 ramps, enhanced access to the airport.

Mileage by State

California2.07 mi

Data Sources

December 31, 2025 Interstate Route Log and Finders List

History

San Bruno, CA - 1966
The ultimate extent of Interstate 380 proposed in 1966. Construction of I-380 displaced the full cloverleaf interchange between U.S. 101 (Bayshore Freeway) and San Bruno Avenue. A portion of the original footprint remains visible on the west side of the junction today.

I-380 was established by the December 1968 Federal Aid Highway Act. It was constructed by the early 1970s to replace California State Route 186. Designated the Portola Freeway, it was also named the Quentin Kopp Freeway in the 1990s.

Plans previously called for extending Interstate 380 west from I-280 to California 1 at Pacifica. Heavily disputed due to environmental, terrain, and traffic impact issues, the roadway remains unbuilt. Provisions were however made at the interchange joining I-280 and I-380 and exit numbers start at five, referencing the unconstructed alignment from Pacifica.

Throughout the latter half of the 20th century, studies also called for additional crossings of San Francisco Bay. One of the corridors considered was a bridge system linking Interstate 380 on the San Francisco Peninsula with Interstate 238 at the East Bay. The crossing was envisioned to span the bay near its widest point. Several obstacles, including funding and mitigating for environmental concerns, prevented the proposed route from moving forward. The I-380 proposal was separate from the "Southern Crossing", a cross bay route considered from San Francisco to Alameda.

East End U.S. 101 ‐ N Access Road – South San Francisco, CA

Interstate 380 East at U.S. 101 North Access Road

I-380 east at US 101

Leading away from I-280, Exit 5 quickly departs Interstate 380 east for SR 82 (El Camino Real) in San Bruno. An unused roadway remains in place between the I-380 roadways from the unbuilt extension. 07/11/18

I-380 east at US 101 I-380 east at US 101 I-380 east at US 101 I-380 east at US 101 I-380 east at SFO N Access Road I-380 east at SFO N Access Road

U.S. 101 South at Interstate 380

US 101 south at I-380

U.S. 101 travels through an industrial area of South San Francisco into the cloverstack interchange (Exit 423) with Interstate 380 west and the ramps to San Francisco International Airport (SFO). Photo by Joel Windmiller (04/07/02)

San Francisco International Airport Access Road - West at U.S. 101 Interstate 380

SFO Access Road at US 101/I-380

Departing from the passenger terminal of San Francisco International Airport, these signs direct motorists to the freeway system. 07/23/16

SFO Access Road at US 101/I-380 SFO Access Road at US 101/I-380 SFO Access Road at US 101/I-380 SFO Access Road at US 101/I-380 SFO Access Road at US 101/I-380 SFO Access Road at US 101/I-380

U.S. 101 North at Interstate 380

US 101 north at I-380

U.S. 101 (Bayshore Freeway) runs along the west side of San Francisco International Airport (SFO) as it travels between San Jose and San Francisco. Travelers continue 1.25 miles beyond the passenger terminal exit to Exit 423 B for Interstate 380 west. 03/26/16

US 101 north at I-380 US 101 north at I-380 US 101 north at I-380 US 101 north at I-380 US 101 north at I-380

Airport Boulevard / North Access Road at Interstate 380 U.S. 101

Airport Boulevard north at I-380/US 101 at SFO International Airport

Airport Boulevard stems north from the intersection of San Bruno Avenue and McDonnell Road and parallels U.S. 101 to Gateway Boulevard at San Mateo Avenue. The arterial connects the SFO Airport car rental facilities with entrance ramps to I-380 west and U.S. 101 north. 07/15/23

Airport Boulevard north at I-380/US 101 at SFO International Airport Airport Blvd north at I-380 west and N Access Road in South San Francisco, CA Airport Blvd south at I-380 Airport Bl at I-380/US 101 N Access Road east at I-380 at SFO International Airport N Access Road east at I-380 and SFO International Airport SFO N Access Rd at I-380 N Access Road west at I-380 and U.S. 101 in San Bruno, CA

East End – Past Views

Past Views Gallery (Tap to Expand / Collapse Section)

Interstate 380 East at U.S. 101

I-380 east at US 101 - 2004

Button copy signs previously posted at the six-ramp parclo interchange (Exit 5) with SR 82 (El Camino Real). 11/26/04

I-380 east at US 101 - 2004 I-380 east at US 101 - 2004 i-280-e-at-us-101-2004-3 I-380 east at US 101 south

West End Interstate 280 ‐ San Bruno, CA

Interstate 380 West at Interstate 280

I-380 west at I-280 in San Bruno, California

Interstate 380 west ahead of the directional T interchange (Exit 5) with I-280 (Father Junipero Serra Freeway). 07/15/23

I-380 west at I-280 in San Bruno, California I-380 west at Exits 5 A/B for I-280 in San Bruno, CA The west end of I-380 at I-280 in San Bruno, CA

Interstate 280 South at Interstate 380

I-280 south at I-380 - San Bruno, CA

Southbound Interstate 280 ahead of Exit 43 A for I-380 east to San Francisco International Airport (SFO). Exit 43 B, a distributor roadway connecting with Sneath Lane and San Bruno Avenue, would have served the western extension of I-380 had it had been constructed. 07/11/18

I-280 south at I-380 - San Bruno, CA I-280 south at I-380 - San Bruno, CA I-280 south at I-380 - San Bruno, CA I-280 south at I-380 - San Bruno, CA

West End – Past Views

Past Views Gallery (Tap to Expand / Collapse Section)

Interstate 380 atInterstate 280

I-380 west at I-280 - 2004

Button copy signs for Interstate 280 were replaced by 2008 to display Exits 5B/A. 11/26/04

I-380 west at I-280 - 2004 I-380 west at I-280 - 2004 I-280 south at I-380 - 2004 I-280 south at I-380 - 2004
Updated September 7, 2023