Flight number record
UA 1377
United Airlines · Denver to Chicago
- Route
- DEN → ORD
- Departs
- 06:00
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1377, check with United Airlines.
UA 1377 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 363 flights, with a median arrival 9 minutes early.
Set against the rest of the country, UA 1377's record is 13 points better than the US average of 77.3%. That gap is worth roughly 127 fewer late arrivals for every thousand flights.
Key figures
On time
90.0%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
0.28%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. The median arrival is 9 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When UA 1377 flies
UA 1377 is scheduled to leave Denver (DEN) at 06:00 local time and reach Chicago (ORD) at 09:38. That slot held for 363 of the 363 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 06:00363 flights100.0%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and UA 1377 runs level with that at 90.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
UA 1377 next to DEN to ORD
Every carrier on DEN to ORD combined arrived on time 71.8% of the time across 6,109 flights, so UA 1377 is 18 points ahead of it. United flew 3,885 flights on the same city pair under all its flight numbers, including this one, and those ran 71.9% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1377thin sample | 363 | 90.0% | 62 min | 0.28% | A+ |
| All United Airlines on DEN–ORD | 3,885 | 71.9% | 82 min | 0.82% | C+ |
| All carriers on DEN–ORD | 6,109 | 71.8% | 88 min | 1.11% | C |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1377 quarter by quarter
Quarter by quarter UA 1377 held fairly steady: 93.3% in Jul–Sep 2025, 87.9% in Oct–Dec 2025, 87.4% in Jan–Mar 2026, 90.1% in Apr–Jun 2026 and 95.2% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights93.3%
- Oct–Dec 202591 flights87.9%
- Jan–Mar 202689 flights87.4%
- Apr–Jun 202691 flights90.1%
- Jul–Sep 202662 flights95.2%
Scale runs 80% to 100%.
By weekday, UA 1377 did best on Tuesday at 96.2% on time and worst on Sunday at 78.8%. Each day rests on about 52 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1377 runs when it is late
UA 1377 often beats the schedule: 121 of 361 completed flights, 34%, arrived 15 minutes or more early. The 36 late arrivals split 13 under half an hour, 14 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early121 flights33.5%
- Within 15 min204 flights56.5%
- 15–29 min late13 flights3.6%
- 30–59 min late14 flights3.9%
- 1–2 hours late4 flights1.1%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 20 departures that left 15 minutes late or more, only 2 made it up before arrival. 18 flights left on time and still arrived late.
The worst days
Worst days for UA 1377
The latest arrival of the period was on 7 December 2025, 3 hours 36 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 December 2025 | 3 hours 36 minutes | Late-arriving aircraft |
| 18 June 2026 | 3 hours 36 minutes | Late-arriving aircraft |
| 18 March 2026 | 3 hours 15 minutes | Late-arriving aircraft |
| 8 February 2026 | 3 hours 9 minutes | Late-arriving aircraft |
| 10 November 2025 | 2 hours 4 minutes | National Airspace System |
Delay causes
Why UA 1377 runs late
National Airspace System accounts for 43% of the 2,237 delay minutes carriers reported here, and the remaining four split what is left.
- 43%National Airspace System
- 34%Late-arriving aircraft
- 21%Carrier
- 2%Extreme weather
34% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,237 reported delay minutes here, that single category outweighs weather by 20 to one. The split is drawn from 2,237 delay minutes reported on UA 1377.
Cancellations are rare at 0.28%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.5% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 888 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on six other city pairs in the data, including ORD to BWI (82), ORD to MYR (35) and ORD to ECP (32), but none flew often enough under UA 1377 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to ORD only.
One caution: this is a thin sample. 363 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking UA 1377
For a booking, UA 1377 has one of the better records a US domestic flight can show: 90.0% on time and 0.28% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to ORD, every carrier and departure
- ORD to DEN, the return direction
- United Airlines 2865 on the same route79.2%
- United Airlines 2329 on the same route84.1%
- United Airlines 1023 on the same route59.8%
- United Airlines 617 on the same route68.8%
- American Airlines 2771 on the same route87.9%
- United Airlines 2258 on the same route71.2%
- Denver International (DEN) delay statistics
- Chicago O'Hare International (ORD) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means United Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.