Tracked live by the FAA. The scheduled times shown are from a typical Tuesday because the FAA's flight plan was first seen after takeoff.
UNITED · FLIGHT UA 1866
DELAYED: NOW PLANNED TO TAKE OFF 11:15 PM ET (40 MIN LATER THAN FIRST FILED)
Tomorrow
UA 1866 · IAD → BOS
departs 12:10 AM ET · arrives 1:49 AM ET
Forecast issued Mon 6:00 AM ET · 18h before departure
Odds over time
Arrive at BOS more than 15 minutes late?
18%
chance · ±1 pts
+4 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 BOS?
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On time or early
82%
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15–30 min late
9%
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30 min–1 hour late
3%
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1–2 hours late
4%
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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%.