Flight number record
UA 1520
United Airlines · Orlando to Denver
- Route
- MCO → DEN
- Departs
- 12:50
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1520, check with United Airlines.
UA 1520 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 15 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 364 flights, with a median arrival 18 minutes early.
Set against the rest of the country, UA 1520's record is 15 points better than the US average of 77.3%. That gap is worth roughly 145 fewer late arrivals for every thousand flights.
Key figures
On time
91.8%
Arrivals under 15 minutes late, of 364 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 18 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 1520 flies
UA 1520 flies MCO to DEN without a single fixed slot. Its most common scheduled departure was 12:50, used on 78 of 364 flights, with 12:25 (66 flights) and 11:50 (53 flights) next.
- Departs 12:5078 flights21.4%
- Departs 12:2566 flights18.1%
- Departs 11:5053 flights14.6%
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 12:50 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 1520 runs 14 points better at 91.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 1520 next to MCO to DEN
Every carrier on MCO to DEN combined arrived on time 80.3% of the time across 4,523 flights, so UA 1520 is 12 points ahead of it. United flew 1,709 flights on the same city pair under all its flight numbers, including this one, and those ran 87.0% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1520thin sample | 364 | 91.8% | 57 min | 0.00% | A+ |
| All United Airlines on MCO–DEN | 1,709 | 87.0% | 80 min | 0.53% | A+ |
| All carriers on MCO–DEN | 4,523 | 80.3% | 64 min | 0.57% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1520 quarter by quarter
Quarter by quarter UA 1520 held fairly steady: 86.7% in Jul–Sep 2025, 92.3% in Oct–Dec 2025, 94.4% in Jan–Mar 2026, 91.2% in Apr–Jun 2026 and 90.3% 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 flights86.7%
- Oct–Dec 202591 flights92.3%
- Jan–Mar 202690 flights94.4%
- Apr–Jun 202691 flights91.2%
- Jul–Sep 202662 flights90.3%
Scale runs 80% to 100%.
By weekday, UA 1520 did best on Tuesday at 96.2% on time and worst on Sunday at 82.7%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1520 runs when it is late
UA 1520 often beats the schedule: 230 of 364 completed flights, 63%, arrived 15 minutes or more early. Most of the lateness is short. 16 of the 30 late arrivals were under half an hour behind, and 9 reached an hour or more.
- 15+ min early230 flights63.2%
- Within 15 min104 flights28.6%
- 15–29 min late16 flights4.4%
- 30–59 min late5 flights1.4%
- 1–2 hours late6 flights1.6%
- 2+ hours late3 flights0.8%
Scale runs 0% to 100%.
Share of 364 completed flights by arrival against schedule.
A late pushback is often recovered here: of 32 departures that left 15 minutes late or more, 12 still arrived on time. 10 flights left on time and still arrived late.
The worst days
Worst days for UA 1520
The latest arrival of the period was on 30 July 2026, 4 hours 51 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across July, September, August, February and April, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 July 2026 | 4 hours 51 minutes | Late-arriving aircraft |
| 14 September 2025 | 3 hours 3 minutes | Late-arriving aircraft |
| 16 August 2026 | 2 hours 19 minutes | Carrier |
| 17 February 2026 | 1 hour 54 minutes | National Airspace System |
| 2 April 2026 | 1 hour 39 minutes | Carrier |
Delay causes
Why UA 1520 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 1,698 reported delay minutes.
- 40%Late-arriving aircraft
- 30%Carrier
- 29%National Airspace System
- 1%Extreme weather
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,698 reported delay minutes here, that single category outweighs weather by 40 to one. The split is drawn from 1,698 delay minutes reported on UA 1520.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are 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.
At 1,547 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on two other city pairs in the data, including EWR to MCO (84) and DEN to BDL (35), but none flew often enough under UA 1520 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MCO to DEN only.
One caution: this is a thin sample. 364 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 1520
For a booking, UA 1520 has one of the better records a US domestic flight can show: 91.8% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- MCO to DEN, every carrier and departure
- DEN to MCO, the return direction
- Frontier Airlines 3311 on the same route76.1%
- Frontier Airlines 1733 on the same route90.4%
- United Airlines 1022 on the same route89.6%
- Orlando International (MCO) delay statistics
- Denver International (DEN) 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.