Schedule: FAA flight plans.
SOUTHWEST · FLIGHT WN 3877
SCHEDULED
Today
WN 3877 · STL → PHX
departs 11:52 AM CT · arrives 1:16 PM MT
Forecast issued Wed 6:00 AM ET · 7h before departure
Odds over time
Arrive at PHX more than 15 minutes late?
13%
chance · ±2 pts
– · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
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How late will it get to PHX?
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On time or early
86%
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15–30 min late
7%
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30 min–1 hour late
3%
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1–2 hours late
2%
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Over 2 hours late
<1%
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Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.