UA5571United Airlines · SFO → ONT
live · 6m ago
Route confirmed United Airlines

UA5571 San FranciscoSFO OntarioONT

UA5571 by United Airlines flies from San Francisco (SFO) to Ontario (ONT).

Right nowNext departure today Operates daily
18:35

scheduled from SFO

The route today

live boards
SFOSan FranciscoHigh riskSFO delay board →
ONTOntarioOn-time likelyONT delay board →
SFO→ONTevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Weather-conditioned outlook for this flight right now

Measured, 90-day sample
53%Chance of 15+ min delay
0.8%Chance of cancellation
+17 minTypical airport delay in this weather

Driven mainly by SFO (San Francisco), currently flying IFR (instrument). 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 at SFO

Forecast

Tue 10 Nov, local date

High21°Clikely 20°C to 23°C
Low13°Clikely 12°C to 15°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

Tomorrow at ONT

Forecast

Tue 10 Nov, local date

High29°Clikely 27°C to 31°C
Low15°Clikely 13°C to 17°C

Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · 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 San Francisco to Ontario flights today

same route · United Airlines
UA1482departs 11:00
UA5592departs 14:00
UA5763departs 16:19
UA436departs 16:35
UA1780departs 18:50
UA8224departs 19:00

If UA5571 is cancelled, these are the other United Airlines nonstop flights from San Francisco to Ontario on the same day, with scheduled departure times in SFO 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 UA5571 actually runs

Pro Flight Search has tracked every published board update for UA5571 across the SFO and ONT boards: schedule changes, gate pushes and actual clocks. Combined risk score: 67.8/100. Based on airport operations, weather, and cached board history at SFO and ONT.

The verdict above is that record speaking, so it reflects how UA5571 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Planning around UA5571? 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: UA5571 San Francisco to Ontario on-time performance, measured from the SFO and ONT airport boards.

Canonical URL
https://proflightsearch.com/flight/UA5571
How we measure this →