Route reliability record
MIA→RDU
Miami to Raleigh
- Flights
- 2,365
- Period
- September 2025 to August 2026
- Distance
- 700 mi
- Carriers
- 5
This route sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 2,365 MIA to RDU flights, with a median arrival 5 minutes early.
Best time to fly MIA to RDU: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 90.0% of the time and Tuesday flights 78.0%, against 71.7% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 6 points behind the country as a whole. Across a thousand flights that is about 56 extra late arrivals.
Key figures
On time
71.7%
Arrivals under 15 minutes late, of 2,322 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
1.61%
National rate is 1.89%
Best carrier
American
72.1% on time across 1,662 flights
These figures cover 2,365 flights between September 2025 and August 2026. Beyond the headline rate, 12.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on MIA to RDU
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 |
|---|---|---|---|---|---|
| Envoy Airthin sample | 104 | 77.7% | 56 min | 0.96% | B+ |
| Frontier Airlinesthin sample | 209 | 74.6% | 61 min | 1.91% | C |
| American Airlines | 1,662 | 72.1% | 72 min | 1.44% | C |
| Delta Air Linesthin sample | 360 | 67.3% | 88 min | 1.94% | C |
| Republic Airwaysthin sample | 30 | 64.3% | 80 min | 6.67% | D− |
Flight by flight
Flights on MIA to RDU
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 Miami to Raleigh
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. 1 of the top 2 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. MIA → RDUMiami to Raleigh | American Airlines | 71.1% | 72.1% | 1.44% | 8am–11am, Wed | AA 1566 21:45 |
| 2. FLL → RDUFort Lauderdale to Raleigh | JetBlue Airways | 66.0% | 67.6% | 2.40% | 5am–8am, Wed | B6 2626 20:00 |
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 24 points, against half a point between the best and worst carrier.
- 5am–8am51 flights90.0%
- 8am–11am406 flights89.0%
- 11am–2pm39 flights75.7%
- 2pm–5pm702 flights66.0%
- 5pm–8pm711 flights69.0%
- 8pm–5am456 flights67.1%
Scale runs 60% to 95%.
Book the early departure. Flights leaving between 5am–8am arrive on time 90.0% of the time, against 66.0% for the afternoon window. That is 24 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 711 flights scheduled in it.
Explore
Filter MIA to RDU 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 MIA to RDU, the best departure window is 5am–8am at 90.0% on time and the worst is 2pm–5pm at 66.0%, a wide gap of 24.0 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am90.0%
- 8–11am89.0%
- 11am–2pm75.7%
- 2–5pm66.0%
- 5–8pm69.0%
- 8pm–5am67.1%
best all US flightsScale 60% to 95%.
Across the year
When delays peak on this route
This route's year swings by 25 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 55.1% on time, 25 points below October, the best at 80.3%. 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. July was the busiest month here, with 233 flights.
Across the week, Tuesday is the strongest day at 78.0% on time and Sunday the weakest at 63.7%, a spread of 14 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 49% of the 48,000 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Late-arriving aircraft
- 30%Carrier
- 14%National Airspace System
- 7%Extreme weather
49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 48,000 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 48,104 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 90.0% on time here.
Cancellations sit at 1.61% against a national 1.89%, which is ordinary. Diversions add another 0.21%.
Connections and stage length
What a delay here actually costs
12.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 700 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 is a different operation and performs like one: it runs 77.8% on time across 2,367 flights, 6 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 6 points of difference.
The sample behind these figures is 2,365 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 RDU 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. October runs 80.3% on time and July 55.1%, a swing of 25 points. If the dates move at all, move them out of July before you think about anything else. 2,322 completed flights over 12 months sit behind that.
Common questions
MIA to RDU questions
How often is MIA to RDU delayed?
Roughly one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 28.3% of the 2,365 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
How reliable is MIA to RDU compared with the rest of the country?
71.7% of flights arrive on time here against a national 77.3%, a difference of 6 points against it. That is worth a C on this site's grading scale.
What time of day has the fewest delays on MIA to RDU?
The 5am–8am departure window is the strongest at 90.0% on time. The 2pm–5pm window is the weakest at 66.0%, 24 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 MIA to RDU?
July is the weakest month at 55.1% on time, compared with 80.3% in October. Across the year that is 25 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
- RDU to MIA — the return legseparate record
- Miami International (MIA) delay statistics
- Raleigh-Durham International (RDU) delay statistics
- Envoy Air on MIA to RDU77.7%
- Frontier Airlines on MIA to RDU74.6%
- American Airlines on MIA to RDU72.1%
- Delta Air Lines on MIA to RDU67.3%
- MIA to ATL, a related route74.2%
- ATL to RDU, a related route80.0%
- MIA to LGA, a related route67.4%
- Envoy Air on-time record77.7%
- Frontier Airlines on-time record74.6%
- American Airlines on-time record72.1%
- Why the first flight of the morning is statistically safest
- How often a connection fails at the major US hubs
Direction matters. MIA to RDU and RDU to MIA 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.