Flight number record
UA 1621
United Airlines · Los Angeles to Orlando
- Route
- LAX → MCO
- Departs
- 10:15
- Flights
- 356
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1621, check with United Airlines.
UA 1621 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 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 45 minutes. That rests on 356 flights, with a median arrival 11 minutes early.
Set against the rest of the country, UA 1621's record is 12 points better than the US average of 77.3%. That gap is worth roughly 116 fewer late arrivals for every thousand flights.
Key figures
On time
88.9%
Arrivals under 15 minutes late, of 352 completed flights
Avg delay
46 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
2.3%
National rate is 8.3%
These figures cover 356 flights between September 2025 and August 2026. The median arrival is 11 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 1621 flies
UA 1621 flies LAX to MCO without a single fixed slot. Its most common scheduled departure was 10:15, used on 83 of 356 flights, with 10:20 (79 flights) and 10:24 (71 flights) next.
- Departs 10:1583 flights23.3%
- Departs 10:2079 flights22.2%
- Departs 10:2471 flights19.9%
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 10:15 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 1621 runs 5 points better at 88.9%. 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 1621 next to LAX to MCO
Every carrier on LAX to MCO combined arrived on time 76.6% of the time across 3,515 flights, so UA 1621 is 12 points ahead of it. United flew 827 flights on the same city pair under all its flight numbers, including this one, and those ran 89.2% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1621thin sample | 356 | 88.9% | 46 min | 0.00% | A+ |
| All United Airlines on LAX–MCO | 827 | 89.2% | 57 min | 0.00% | A+ |
| All carriers on LAX–MCO | 3,515 | 76.6% | 66 min | 0.68% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1621 quarter by quarter
UA 1621 did not run the same all year. Its best quarter was Oct–Dec 2025 at 93.4% on time and its weakest Jul–Sep 2026 at 82.0%, a swing of 11 points on roughly 89 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights—
- Oct–Dec 202592 flights93.4%
- Jan–Mar 202686 flights85.9%
- Apr–Jun 202686 flights91.9%
- Jul–Sep 202662 flights82.0%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1621 did best on Wednesday at 100.0% on time and worst on Saturday at 78.7%. Each day rests on about 51 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1621 runs when it is late
UA 1621 often beats the schedule: 134 of 352 completed flights, 38%, arrived 15 minutes or more early. The 39 late arrivals split 17 under half an hour, 14 between 30 and 60 minutes, and 8 an hour or more.
- 15+ min early134 flights38.1%
- Within 15 min179 flights50.9%
- 15–29 min late17 flights4.8%
- 30–59 min late14 flights4.0%
- 1–2 hours late7 flights2.0%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 352 completed flights by arrival against schedule.
7 of 28 late departures made up the time and arrived on time, 25% of them. In the other direction, 18 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at MCO.
The worst days
Worst days for UA 1621
The latest arrival of the period was on 24 November 2025, 4 hours 33 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across November, September and March, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 24 November 2025 | 4 hours 33 minutes | Carrier |
| 16 September 2025 | 1 hour 30 minutes | Carrier |
| 8 September 2025 | 1 hour 26 minutes | Late-arriving aircraft |
| 14 March 2026 | 1 hour 24 minutes | National Airspace System |
| 7 March 2026 | 1 hour 20 minutes | National Airspace System |
Delay causes
Why UA 1621 runs late
National Airspace System accounts for 48% of the 1,777 delay minutes carriers reported here, and the remaining four split what is left.
- 48%National Airspace System
- 36%Carrier
- 15%Late-arriving aircraft
48% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 858 minutes out of 1,777, against a national NAS share of 21%. The split is drawn from 1,777 delay minutes reported on UA 1621.
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 2.3% 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 2,218 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 five other city pairs in the data, including MCO to ORD (58), MCO to SFO (21) and ORD to LAX (17), but none flew often enough under UA 1621 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LAX to MCO only.
One caution: this is a thin sample. 356 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 1621
For a booking, UA 1621 has one of the better records a US domestic flight can show: 88.9% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- LAX to MCO, every carrier and departure
- MCO to LAX, the return direction
- Delta Air Lines 867 on the same route68.1%
- Delta Air Lines 482 on the same route82.0%
- Delta Air Lines 718 on the same route75.2%
- American Airlines 1024 on the same route67.8%
- American Airlines 1118 on the same route80.6%
- Delta Air Lines 547 on the same route78.2%
- Los Angeles International (LAX) delay statistics
- Orlando International (MCO) 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
- Worst months to fly in the US, ranked by the data
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.