Will I-405 Sepulveda Pass Cuts Delay Your LAX Drive?

Caltrans will pinch southbound Interstate 405 through the Sepulveda Pass for another extended weekend beginning Friday night, September 11, 2026. The District 7 advisory says the freeway drops to three southbound lanes from 10 p.m. Friday through 5 a.m. Monday, September 14.

That corridor is the main mountain crossing between the San Fernando Valley and the Westside, so airport runs, hotel transfers, and cruise embarkation drives toward Los Angeles International Airport feel the squeeze first. Northbound I-405 is not part of this weekend cut.

What Caltrans is closing on the mountain pass

During the September 11 to 14 window, southbound I-405 stays open but thinner. Crews will keep three lanes available between Ventura Boulevard and Mulholland Drive while they continue paving work through the pass.

Ramp closures stack on top of the lane cut. Caltrans lists the Ventura Boulevard on-ramp to southbound I-405 as closed, plus the southbound off-ramp and on-ramp pair at Valley Vista Boulevard and Sepulveda Boulevard.

The northbound I-405 off-ramp to Getty Center Drive is also closed for the weekend block. Drivers headed to the Getty should plan a different exit before they reach the pass, or leave earlier and use surface streets once they are off the freeway.

SoCal511 mirrors the same September 11 to 14 southbound three-lane message for the Sepulveda Pass, which matches the Caltrans dates travelers should put on their itinerary.

Why this weekend matters for LAX and Westside trips

Southbound I-405 through the pass is the default route from Valley hotels, Burbank connections, and many inland stays toward Westwood, Santa Monica, and LAX. Cutting the roadway to three lanes does not shut the freeway, but it removes the spare capacity that usually absorbs Friday and Sunday peak traffic.

If your flight leaves LAX on Saturday or Sunday morning, treat Friday night and early Saturday as the highest-risk arrival windows into the airport area. Build a larger buffer than a normal Sepulveda Pass drive, and watch for backup that starts well north of Mulholland.

Travelers stitching together a short Los Angeles stay can still keep the city plan intact by shifting the order of stops. A flexible Los Angeles three-day itinerary helps you put Valley or Hollywood time earlier and leave Westside or airport moves for clearer hours.

How this September window differs from July

Deep Arrival already covered an earlier Sepulveda Pass push in July, when Caltrans scheduled a different multi-day southbound reduction. That July advisory used a separate date block and a tighter lane count on parts of the corridor.

This September notice is a new dated traveler decision: a fresh Friday-to-Monday clock, a three-lane southbound target between Ventura and Mulholland, and a specific ramp list that includes Getty Center Drive. Use the July story only for background on the broader paving campaign, not as the current schedule.

For chronology, see Caltrans Sets I-405 Sepulveda Pass Closures July 17 to 27. Treat that post as prior context, then follow the September advisory for the next trip.

Residents and businesses beside the work zone may notice noise, vibration, and dust while crews keep the extended weekend schedule. That does not change the traveler rule for visitors: the published lane and ramp list is what matters for airport timing and hotel transfers.

If you are connecting from a Valley hotel to a Saturday cruise embarkation in the Los Angeles harbor area, the same southbound pinch can cascade into a late terminal arrival. Leave earlier than the ship line recommends when your route still depends on the Sepulveda Pass.

Detours, transit, and practical buffers

Caltrans is telling drivers to seek alternate routes and consider public transportation rather than force the pass at peak times. US-101, I-5, and local arterials can absorb some Valley-to-Westside trips, but they also fill when the 405 is constrained.

Airport-bound travelers with a long layover can reduce stress by staying closer to the terminals instead of crossing the pass twice in one day. The what to do near LAX guide is useful when you want a short outing without re-entering the Sepulveda bottleneck.

If you are transferring from inland Southern California, a booked car service on a timed schedule can still help, but ask the driver about the September 11 to 14 southbound cut before you lock a pick-up that depends on a fast I-405 run. Schedules change when QuickMap shows growing queues.

Caltrans also notes that weather or field conditions can shift exact times, lane counts, and ramp details. Check Caltrans QuickMap on the day of travel and leave room to reroute.

What the larger paving project is doing

The weekend work sits inside the I-405 Pavement Rehabilitation Project between Van Nuys and Westwood. Caltrans describes about $143.7 million in improvements meant to extend pavement life and keep the pass safer and more reliable once the campaign finishes.

The agency has planned roughly two dozen extended weekend lane reductions across the project, typically running about 10 p.m. Friday to about 5 a.m. Monday. Those windows are not full freeway shutdowns. At least two or three lanes stay open depending on the work package.

For travelers, the practical takeaway is simple: every new published weekend is its own decision point. Do not assume last month’s lane count or ramp list still applies when you drive to the airport or a Westside hotel.

For now, the confirmed traveler action is narrow and dated. If your weekend depends on a fast southbound run through the Sepulveda Pass, change the clock or the route before September 11 rather than hoping the mountain corridor behaves like a normal Friday.