UA1263United Airlines · ONT → DEN
live · 13m ago
Route confirmed United Airlines

UA1263 OntarioONT · 13:22 DenverDEN · 16:45

UA1263 by United Airlines flies from Ontario (ONT) to Denver (DEN) for the Wed, Oct 14 departure.

Right nowExpected in Denver · On time
16:45

arrival expected at DEN · on schedule

Typical gate push+21 minmedian posted departure
Typical arrival−14 minmedian over 5 operations
Wins back in air~35 minmedian gate push vs arrival · how planes make up time →

Where the minutes go

last 6 operations · gate push → arrival
0+30+60+90 min
10-14
+21 gate
10-13
+21 gate · −14 arrival
10-12
+21 gate · −8 arrival
10-11
+15 gate · −5 arrival
10-10
+10 gate · −27 arrival
10-09
+6 gate · −16 arrival

The bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.

The last 30 days

arrival outcome per operation

median arrival −14 min · 0 cancelled · 6 operations tracked

The route today

live boards
ONTOntarioOn-time likelyONT delay board →
DENDenverHigh riskDEN delay board →
ONT→DENevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Delay & cancellation outlook for this flight

Measured, 90-day sample
38%Chance of 15+ min delay
5.4%Chance of cancellation
+8 minAvg hub delay right now

Conditions at ONT and DEN are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, 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 →

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 Ontario to Denver flights today

same route · United Airlines
UA2446departs 05:00

If UA1263 is cancelled, this is the other United Airlines nonstop flight from Ontario to Denver on the same day, with scheduled departure times in ONT local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →

How UA1263 actually runs

Pro Flight Search has tracked every published board update for UA1263 across the ONT and DEN boards: schedule changes, gate pushes and actual clocks. Usually lands ~14 min early. Based on 5 confirmed landings · 5/5 within 15 min of schedule. Pushes back late but makes up time in the air.

The verdict above is that record speaking, so it reflects how UA1263 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocksaircraft

Board log

scheduled → actual, per operation
10-14ONT 13:22 13:43 (+21)DEN 16:45
10-13ONT 13:22 13:43 (+21)DEN 16:45 16:31 (−14)
10-12ONT 13:24 13:45 (+21)DEN 16:45 16:37 (−8)
10-11ONT 13:24 13:39 (+15)DEN 16:45 16:40 (−5)
10-10ONT 13:22 13:32 (+10)DEN 16:45 16:18 (−27)
10-09ONT 13:24 13:30 (+6)DEN 16:45 16:29 (−16)

Aircraft

Recent tails: N829UA, N37554, N17408, N854UA.

Board clocks recorded as ONT and DEN published them.

Planning around UA1263? 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 — UA1263 Ontario to Denver on-time performance, measured from the ONT and DEN airport boards.

Canonical URL
https://proflightsearch.com/flight/UA1263
How we measure this →