Route reliability record
IAD→MCO
Washington to Orlando
- Flights
- 2,180
- Period
- September 2025 to August 2026
- Distance
- 758 mi
- Carriers
- 2
This route lands a B, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 2,180 IAD to MCO flights, with a median arrival 9 minutes early.
Best time to fly IAD to MCO: a 8am–11am departure, ideally on a Tuesday. Flights in that window arrived on time 89.2% of the time and Tuesday flights 87.1%, against 80.7% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.7%
Arrivals under 15 minutes late, of 2,146 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
Best carrier
United
82.5% on time across 1,874 flights
These figures cover 2,180 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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Carrier by carrier
Which airline is most reliable on IAD to MCO
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 | 1,874 | 82.5% | 69 min | 0.91% | B+ |
| Frontier Airlinesthin sample | 306 | 69.6% | 101 min | 2.29% | C |
Flight by flight
Flights on IAD to MCO
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Washington to Orlando
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 4 of the top 5 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. IAD → MCOWashington to Orlando | United Airlines | 81.7% | 82.5% | 0.91% | 8am–11am, Tue | UA 1926 09:45 |
| 2. DCA → MCOWashington to Orlando | American Airlines | 75.7% | 77.6% | 2.42% | 5am–8am, Tue | — |
| 3. BWI → MCOBaltimore to Orlando | Southwest Airlines | 75.1% | 76.8% | 2.24% | 5am–8am, Wed | — |
| 4. DCA → MCOWashington to Orlando | Delta Air Lines | 75.0% | 77.8% | 3.66% | 5am–8am, Tue | DL 1003 06:59 |
| 5. DCA → MCOWashington to Orlando | Southwest Airlines | 71.7% | 73.2% | 2.01% | 8am–11am, Tue | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 18 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am657 flights89.2%
- 11am–2pm442 flights82.2%
- 2pm–5pm202 flights71.4%
- 5pm–8pm496 flights72.7%
- 8pm–5am383 flights79.7%
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 89.2% of the time, against 71.4% for the afternoon window. That is 18 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 657 flights scheduled in it.
Explore
Filter IAD to MCO by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On IAD to MCO, the best departure window is 8am–11am at 89.2% on time and the worst is 2pm–5pm at 71.4%, a wide gap of 17.8 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am89.2%
- 11am–2pm82.2%
- 2–5pm71.4%
- 5–8pm72.7%
- 8pm–5am79.7%
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 30 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
July is the worst month at 61.8% on time, 30 points below April, the best at 91.4%. 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. April was the busiest month here, with 212 flights.
Across the week, Tuesday is the strongest day at 87.1% on time and Sunday the weakest at 73.8%, a spread of 13 points.
Delay causes
Why this route gets delayed
National Airspace System accounts for 42% of the 32,000 delay minutes carriers reported here, and the remaining four split what is left.
- 42%National Airspace System
- 31%Late-arriving aircraft
- 24%Carrier
- 4%Extreme weather
42% 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 13,000 minutes out of 32,000, against a national NAS share of 21%. The split is drawn from 31,587 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 89.2% on time here.
Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.46%.
Connections and stage length
What a delay here actually costs
7.4% of arrivals land an hour or more late, close to the national 8.3%, so 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.
The return leg runs 82.0% on time across 2,181 flights, within about 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 2,180 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.
Work out the risk of missing a connection in MCO after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 91.4% on time and July 61.8%, a swing of 30 points. If the dates move at all, move them out of July before you think about anything else. 2,146 completed flights over 12 months sit behind that.
Common questions
IAD to MCO questions
How often is IAD to MCO delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 19.3% of the 2,180 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
How reliable is IAD to MCO compared with the rest of the country?
80.7% of flights arrive on time here against a national 77.3%, a difference of 3 points in its favour. That is worth a B on this site's grading scale.
What time of day has the fewest delays on IAD to MCO?
The 8am–11am departure window is the strongest at 89.2% on time. The 2pm–5pm window is the weakest at 71.4%, 18 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are July delays on IAD to MCO?
July is the weakest month at 61.8% on time, compared with 91.4% in April. Across the year that is 30 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- MCO to IAD — the return legseparate record
- Washington Dulles International (IAD) delay statistics
- Orlando International (MCO) delay statistics
- United Airlines on IAD to MCO82.5%
- Frontier Airlines on IAD to MCO69.6%
- IAD to ATL, a related route78.0%
- ATL to MCO, a related route70.3%
- IAD to DEN, a related route83.1%
- United Airlines on-time record82.5%
- Frontier Airlines on-time record69.6%
- The best time of day to fly, according to 7.05 million flight records
- Worst months to fly in the US, ranked by the data
Direction matters. IAD to MCO and MCO to IAD are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.