Carrier route record
UAIAD→MCO
United Airlines · Washington to Orlando
- Flights
- 1,897
- Period
- July 2025 to June 2026
- Share of route
- 87%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with United Airlines.
United on IAD to MCO lands a B+, 5 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 1,897 flights, with a median arrival 9 minutes early.
Set against the rest of the country, United's IAD to MCO record is 5 points better than the US average of 77.6%. That gap is worth roughly 54 fewer late arrivals for every thousand flights.
Key figures
On time
83.0%
Arrivals under 15 minutes late, of 1,878 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.58%
National rate is 1.81%
Whole route
81.7%
Every carrier on IAD to MCO, 2,176 flights
These figures cover 1,897 flights between July 2025 and June 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.
Carrier by carrier
United against every carrier on IAD to MCO
United flew 1,897 of the 2,176 flights on IAD to MCO, most of the route. Its 83.0% on time is about level with the route as a whole at 81.7%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from United at 83.0% to Frontier at 72.3%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines (this page) | 1,897 | 83.0% | 70 min | 0.58% | B+ |
| Frontier Airlinesthin sample | 279 | 72.3% | 77 min | 2.87% | C |
Flight by flight
United flight numbers on IAD to MCO
Departure window
When United runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 19 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am652 flights89.8%
- 11am–2pm364 flights86.1%
- 2pm–5pm133 flights80.3%
- 5pm–8pm408 flights71.3%
- 8pm–5am340 flights82.0%
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 89.8% of the time, against 71.3% for the evening window. That is 19 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 652 flights scheduled in it.
Across the year
United on IAD to MCO through the year
August is the worst month at 72.1% on time, 22 points below April, the best at 93.7%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. March was the busiest month here, with 175 flights.
Across the week, Tuesday is the strongest day at 89.4% on time and Sunday the weakest at 74.7%. 15 points is a smaller lever than departure hour, but it is free.
Delay causes
Why United runs late on this route
One category carries most of the weight here. National Airspace System accounts for 45% of the 22,000 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.
- 45%National Airspace System
- 28%Late-arriving aircraft
- 23%Carrier
- 4%Extreme weather
45% 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 9,932 minutes out of 22,000, against a national NAS share of 21%. The split is drawn from 22,308 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 89.8% on time here.
Cancellations are rare at 0.58%, below the national 1.81% 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 stage length
What a delay here costs
6.7% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
The 758 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg runs 82.9% on time across 1,898 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,897 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking United on IAD to MCO
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 93.7% on time and August 72.1%, a swing of 22 points. If the dates move at all, move them out of August before you think about anything else. 1,878 completed flights over 12 months sit behind that.
Related
Where to go next
- IAD to MCO, every carrier
- United on MCO to IAD, the return leg
- Frontier Airlines on IAD to MCO72.3%
- United Airlines network-wide record
- Washington Dulles International (IAD) delay statistics
- Orlando International (MCO) delay statistics
- The best time of day to fly, according to 7.04 million flight records
- Worst months to fly in the US, ranked by the data
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.