Schedule: FAA flight plans.
SOUTHWEST · FLIGHT WN 3978
SCHEDULED
Today
WN 3978 · SLC → PHX
departs 5:05 AM MT · arrives 6:56 AM MT
Forecast issued Mon 3:00 AM ET · 4h before departure
Odds over time
Arrive at PHX more than 15 minutes late?
10%
chance · ±0 pts
+3 pts · 24h
HOW SURE WE ARE
High. The odds now come mostly from live FAA and airport data.
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How late will it get to PHX?
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On time or early
89%
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15–30 min late
6%
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30 min–1 hour late
0%
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1–2 hours late
2%
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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%.