Flight number record

UA 1520

United Airlines · Orlando to Denver

Route: MCO → DEN
Departs: 12:25
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 13 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over 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 13 points better than the US average of 77.6%. That gap is worth roughly 133 fewer late arrivals for every thousand flights.

On time

90.9%

Arrivals under 15 minutes late, of 363 completed flights

Avg delay

80 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

3.0%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 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.

Schedule

When UA 1520 flies

UA 1520 flies MCO to DEN without a single fixed slot. Its most common scheduled departure was 12:25, used on 66 of 364 flights, with 11:50 (53 flights) and 12:50 (47 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 12:2566 flights18.1%
Departs 11:5053 flights14.6%
Departs 12:5047 flights12.9%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 12:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 1520 runs 12 points better at 90.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

UA 1520 next to MCO to DEN

Every carrier on MCO to DEN combined arrived on time 79.0% of the time across 4,579 flights, so UA 1520 is 12 points ahead of it. United flew 1,758 flights on the same city pair under all its flight numbers, including this one, and those ran 85.0% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 12 points.

UA 1520 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1520thin sample	364	90.9%	80 min	0.00%	A+
All United Airlines on MCO–DEN	1,758	85.0%	87 min	0.63%	A+
All carriers on MCO–DEN	4,579	79.0%	66 min	0.59%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1520 quarter by quarter

Quarter by quarter UA 1520 held fairly steady: 85.7% in Jul–Sep 2025, 92.3% in Oct–Dec 2025, 94.4% in Jan–Mar 2026 and 91.2% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights85.7%
Oct–Dec 202591 flights92.3%
Jan–Mar 202690 flights94.4%
Apr–Jun 202691 flights91.2%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1520 did best on Monday at 94.2% on time and worst on Sunday at 80.8%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1520 runs late

One category carries most of the weight here. Carrier accounts for 53% of the 2,644 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
53%
Late-arriving aircraft
23%
National Airspace System
22%
Extreme weather
2%

The largest share of delay minutes, 53%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,392 of the 2,644 delay minutes reported here. The split is drawn from 2,644 delay minutes reported on UA 1520.

Cancellations are rare at 0.00%, below the national 1.81% 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 3.0% land an hour or more behind schedule, against 8.1% 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: 90.9% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures