UA3900United Airlines · ORD → LAX
updated 1h ago
Route confirmed United Airlines

UA3900 ChicagoORD Los AngelesLAX

UA3900 by United Airlines flies from Chicago (ORD) to Los Angeles (LAX).

Right nowNext departure tomorrow Operates daily
06:30

scheduled from ORD

The route today

live boards
ORDChicagoOn-time likelyORD delay board →
LAXLos AngelesOn-time likelyLAX delay board →
ORD→LAXevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
41%Chance of 15+ min delay
1.6%Chance of cancellation
+9 minTypical airport delay in this weather

Conditions at ORD and LAX are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. These figures come from both airports' records under conditions like today's, over the last 90 days.

Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →

Tomorrow on this route

Forecast

Chicago to Los Angeles with United Airlines · Sun 1 Nov, local date

Outlook: about usual
Chance a departure is cancelled
0.3%1.4× usual
Chance a departure leaves 60+ min late
8.2%0.8× usual

Forecast weather: 83% chance of rain at Los Angeles

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · About 11 departures a day on this route with this airline. · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

When it flies

scheduled departures
061422
M
T
W
T
F
S
S

Each mark is a scheduled departure at its origin-local time. Today is highlighted.

Other Chicago to Los Angeles flights today

same route · United Airlines
UA1333departs 05:55
UA2361departs 07:00
UA3760departs 07:00
UA1309departs 08:45
UA2814departs 08:50
UA1219departs 10:25

If UA3900 is cancelled, these are the other United Airlines nonstop flights from Chicago to Los Angeles on the same day, with scheduled departure times in ORD local time. Most flights that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →

How UA3900 actually runs

Pro Flight Search has tracked every published board update for UA3900 across the ORD and LAX boards: schedule changes, gate pushes and actual clocks. Combined risk score: 33.0/100. Based on airport operations, weather, and cached board history at ORD and LAX.

The verdict above is that record speaking, so it reflects how UA3900 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Planning around UA3900? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search: UA3900 Chicago to Los Angeles on-time performance, measured from the ORD and LAX airport boards.

Canonical URL
https://proflightsearch.com/flight/UA3900
How we measure this →