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 1577 IN THE AIR (OFF 3:03 PM CT, ETA 4:56 PM PT)
Today

UA 1577 · ORD → SFO

took off 3:03 PM CT · expected to land 4:56 PM PT (scheduled 2:30 PM CT → 5:19 PM PT)
Forecast issued Tue 5:00 PM ET · 2h after departure

Odds over time

Arrive at SFO more than 15 minutes late?
<1% chance · ±0 pts −2 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
WEATHER FORECASTS LIVE IN THE AIR 0% 15% 30% 45% 60% 2.7d 2d 1d 12h 6h Departs Lands

How late will it get to SFO?

LIVE
  1. On time or early
    100%
  2. 15–30 min late
    <1%
  3. 30 min–1 hour late
    0%
  4. 1–2 hours late
    0%
  5. Over 2 hours late
    0%

Gate arrival compared with the scheduled arrival. The ranges add up to 100%; while it’s in the air they come from the FAA’s arrival estimate.