San Francisco Airport: 224 Delays, 7 Cancellations April 2026
San Francisco International Airport records 224 delays and 7 cancellations on April 4, 2026. United leads with 73 delays and 3 cancellations disrupting routes to LA, New York, Phoenix, and beyond.
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San Francisco International Airport (SFO) logged 224 delays and 7 cancellations on April 4, 2026, with United Airlines recording the most disruption — 73 delays and 3 cancellations — and SkyWest, Southwest, American, and Alaska Airlines also significantly impacted.
Context and Background
SFO is a critical gateway for both domestic US travel and transpacific routes. While Winter Storm Kadence did not hit California directly, the ripple effects from grounded aircraft at Chicago O'Hare and Denver cascaded into SFO's inbound rotations throughout April 4. FlightAware tracking confirms the disruption pattern follows the national airspace system collapse rather than local weather conditions in San Francisco.
International carriers — including Lufthansa, Singapore Airlines, Emirates, Air Canada, and KLM — also experienced minor but observable delays on their SFO legs, confirming how a US domestic storm can extend disruption to global aviation schedules.
Airline-Level Breakdown at SFO
| Airline | Cancellations | Delays |
|---|---|---|
| United Airlines | 3 | 73 |
| SkyWest Airlines | 0 | 38 |
| Southwest Airlines | 1 | 29 |
| Alaska Airlines | 0 | 23 |
| Delta Air Lines | 0 | 13 |
| American Airlines | 2 | 12 |
| Air Canada | 1 | 3 |
Routes most disrupted: Los Angeles (LAX), JFK New York, Phoenix (PHX), Seattle (SEA), and Chicago O'Hare (ORD). International connections to Japan, Singapore, Canada, and Europe also experienced delays.
What Travelers Get (Key Facts at SFO)
- 224 total delays and 7 cancellations at SFO on April 4, 2026
- United Airlines hit hardest: 73 delays and 3 cancellations — highest among all SFO carriers
- SkyWest Airlines' 38 delays reflect regional feeder network stress under hub-driven rotation breakdowns
- Alaska Airlines recorded 23 delays on West Coast routes
- International routes to Japan, Singapore, Europe, and Canada saw minor but confirmed delays from Lufthansa, Singapore Airlines, Emirates, and KLM
What This Means for Travelers
SFO passengers on United should monitor the United app continuously — United's rotation-heavy SFO hub means that a single late-arriving aircraft from Chicago or Denver can cascade multiple downstream departure delays across afternoon banks.
Passengers on international itineraries connecting through SFO — particularly those transiting to/from Asia or Europe — should contact their carrier about minimum connection time extensions. Weather waivers on most US carriers now extend to itineraries where the disruption originates at an upstream domestic airport, even if your booked departure is from SFO.
FAQ: San Francisco Airport Disruptions April 2026
Q: How many flights were canceled at San Francisco International on April 4, 2026? 7 cancellations and 224 delays. United Airlines posted 3 cancellations — the highest among carriers at SFO that day.
Q: Were international flights affected at SFO? Yes. Air Canada had 1 cancellation and 3 delays. Lufthansa, Singapore Airlines, Emirates, and KLM also reported minor delays on their SFO legs.
Q: Why is SFO disrupted when the storm is in the US Midwest? SFO relies on inbound aircraft arriving from Chicago, Denver, and New York. When those hubs break down, SFO loses incoming aircraft needed to fly its scheduled outbound departures.
Related Travel Guides
Denver International 323 Delays 15 Cancellations April 2026
Harry Reid Airport 208 Delays 12 Cancellations April 2026
Boston Logan Airport 160 Delays 11 Cancellations April 2026
Disclaimer: Disruption data is sourced from FlightAware and subject to change. Always verify your flight status directly with your airline before traveling.
Raushan Kumar
Founder & Lead Developer
Full-stack developer with 11+ years of experience and a passionate traveller. Raushan built Nomad Lawyer from the ground up with a vision to create the best travel and law experience on the web.
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