San Francisco International Airport is becoming a more complicated summer gateway for U.S. travelers: flight delays have worsened sharply after new landing constraints and runway construction, even as the airport rolls out faster customs processing for U.S. citizens arriving from abroad.
The combination matters because SFO is both a major domestic hub and one of the West Coast's most important international entry points. For travelers connecting through San Francisco, the latest data points in two directions at once: the international arrivals hall may move more efficiently for eligible U.S. citizens, but the airfield itself has less room for schedule recovery when weather, congestion or late-arriving aircraft start to stack up.
What changed at SFO
A San Francisco Chronicle analysis published June 22 found that SFO's average delay time between April 1 and June 10 rose to about 20 minutes, compared with about five minutes during the same period in 2025. The increase was not just about a few long disruptions. The share of arrivals and departures delayed by at least 15 minutes rose from about 18% last spring to roughly 41% this spring, according to the report.
The timing is important. The delay spike followed a Federal Aviation Administration restriction on parallel landings on SFO's closely spaced east-west runways, along with a major runway project that began March 30. Runway 1 Right is closed for a $180 million renovation that includes repaving, taxiway improvements, lighting upgrades and new markings, with work scheduled to continue into early October.
SFO's own airport-operations guidance explains the structural problem. The airport operates two sets of parallel runways, but the runways are only 750 feet apart. In fair weather, SFO says it can currently handle about 45 arrivals per hour. When aircraft must arrive single-file, the arrival rate drops to roughly 36 per hour, often requiring the FAA to meter flights into the airport through a ground delay program.
Why this matters for U.S. travelers
For passengers, a 20-minute average delay does not sound catastrophic on its own. The larger issue is reliability. When more than four in ten flights are running at least 15 minutes late during the measured period, tight connections become riskier, aircraft utilization becomes harder for airlines, and small schedule problems can spread across the day.
The Chronicle analysis found that delay pressure was worst in the afternoon and evening, especially around 1 p.m. and 9 p.m., while early morning flights performed better. That pattern is familiar at constrained airports: once aircraft arrive late, crews and gates can fall behind, and later departures have less margin to recover.
For Bay Area visitors, this means SFO should be treated as a high-value but capacity-sensitive airport through the summer. Travelers with meetings, cruises, tours or long international connections should avoid building itineraries around minimum connection times. Those heading into San Francisco, Silicon Valley, Napa, Monterey or other Northern California destinations should also leave more space between landing time and fixed reservations.
Odyssey travelers can monitor current airport options through the San Francisco International Airport guide and check real-time departures and arrivals on the SFO online flight board before committing to pickup times or onward plans.
Customs is getting a separate upgrade
The airport-capacity picture is not all negative. SFO announced this month that it has launched Enhanced Passenger Processing with U.S. Customs and Border Protection for U.S. citizens arriving from international destinations. The contactless process uses auto-capture cameras and biometric facial comparison technology in the passport-processing area.
According to SFO, CBP has recorded an average 25% reduction in wait times for U.S. citizens since launching Enhanced Passenger Processing nationally. The system compares a traveler's live image with passport photos already stored in CBP records, verifies identity and citizenship, runs law-enforcement vetting and creates the travel record while CBP officers remain available to assist passengers.
That should help many returning U.S. travelers move through the federal-inspection portion of an international arrival more smoothly. But it does not remove the need for realistic connection planning. A faster customs process can reduce one bottleneck; it cannot fix a late inbound aircraft, an airfield ground delay, a missed bag transfer or a domestic departure that closes its door before a passenger reaches the gate.
How to plan around SFO this summer
The practical takeaway is not to avoid SFO. The airport remains one of the strongest gateways for Asia-Pacific travel, transcontinental flights and Northern California tourism. The smarter move is to build in a wider buffer than a normal summer itinerary might require.
- Choose early departures when possible, especially for domestic trips with important same-day plans.
- Avoid very tight domestic-to-international or international-to-domestic connections through SFO while runway work and arrival constraints are active.
- Check airline apps and the airport flight board before leaving for the airport, not only after arriving at the terminal.
- For international arrivals, treat faster customs processing as a benefit, not a guarantee that every step of the trip will run ahead of schedule.
- Leave extra time for ground transportation if a delayed arrival pushes pickup into commute hours.
Ground plans deserve special attention because a late flight can shift a smooth arrival into peak Bay Area traffic. Travelers comparing private pickup, rideshare and taxi options can review SFO transfers and taxi guidance, while visitors planning to drive beyond the city can check SFO car rental information before deciding whether airport pickup still makes sense after a delayed arrival.
The broader market signal
SFO's situation is a reminder that U.S. airport performance in 2026 is not only about passenger demand. Infrastructure projects, safety rules, runway geometry, staffing, weather and airline scheduling all shape the traveler experience. Even when terminals add technology that speeds up one part of the journey, airfield capacity can remain the limiting factor.
For airlines, travel advisors and corporate travel managers, the near-term lesson is conservative scheduling. SFO remains essential, but it should be planned as an airport where a strong itinerary gives travelers room to absorb delays. For leisure travelers, the same rule applies in simpler terms: the cheapest or shortest connection may not be the best connection if it leaves no recovery time.