Schedule: a typical Friday (the flights of Jul 31, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
SOUTHWEST · FLIGHT WN 4603
SCHEDULED · TYPICAL SCHEDULE
WN 4603 · PHX → SFO
departs 9:55 AM MT · arrives 12:00 PM PT
Forecast issued Wed 10:00 AM ET · 51h before departure
Odds over time
Arrive at SFO more than 15 minutes late?
23%
chance · ±2 pts
– · 24h
HOW SURE WE ARE
Moderate. The odds now blend history with early weather forecasts.
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How late will it get to SFO?
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On time or early
77%
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15–30 min late
9%
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30 min–1 hour late
7%
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1–2 hours late
5%
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Over 2 hours late
2%
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Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.