Route reliability record
RDU→MIA
Raleigh to Miami
- Flights
- 2,367
- Period
- September 2025 to August 2026
- Distance
- 700 mi
- Carriers
- 5
This route lands a B, level with the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 2,367 RDU to MIA flights, with a median arrival 8 minutes early.
Best time to fly RDU to MIA: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 91.6% of the time and Wednesday flights 83.6%, against 77.8% 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
77.8%
Arrivals under 15 minutes late, of 2,323 completed flights
Avg delay
95 min
Across delayed arrivals only, not all flights
Cancelled
1.73%
National rate is 1.89%
Best carrier
American
78.4% on time across 1,666 flights
These figures cover 2,367 flights between September 2025 and August 2026. Beyond the headline rate, 10.0% 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 RDU to MIA
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 |
|---|---|---|---|---|---|
| Delta Air Linesthin sample | 360 | 84.2% | 82 min | 1.67% | B |
| American Airlines | 1,666 | 78.4% | 104 min | 1.56% | B |
| Envoy Airthin sample | 102 | 74.3% | 69 min | 0.98% | C+ |
| Frontier Airlinesthin sample | 209 | 66.8% | 78 min | 3.35% | C− |
| Republic Airwaysthin sample | 30 | 58.6% | 49 min | 3.33% | D− |
Flight by flight
Flights on RDU to MIA
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 Raleigh to Miami
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. RDU → FLLRaleigh to Fort Lauderdale | JetBlue Airways | 77.8% | 79.5% | 2.10% | 5am–8am, Wed | B6 2625 07:00 |
| 2. RDU → MIARaleigh to Miami | American Airlines | 77.2% | 78.4% | 1.56% | 5am–8am, Thu | — |
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 32 points, against half a point between the best and worst carrier.
- 5am–8am503 flights91.6%
- 8am–11am653 flights84.8%
- 11am–2pm410 flights79.6%
- 2pm–5pm49 flights59.6%
- 5pm–8pm612 flights61.0%
- 8pm–5am140 flights70.9%
Scale runs 50% to 95%.
Book the early departure. Flights leaving between 5am–8am arrive on time 91.6% of the time, against 59.6% for the afternoon window. That is 32 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 653 flights scheduled in it.
Explore
Filter RDU to MIA 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 RDU to MIA, the best departure window is 5am–8am at 91.6% on time and the worst is 2pm–5pm at 59.6%, a wide gap of 32.0 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am91.6%
- 8–11am84.8%
- 11am–2pm79.6%
- 2–5pm59.6%
- 5–8pm61.0%
- 8pm–5am70.9%
best all US flightsScale 50% to 95%.
Across the year
When delays peak on this route
Twelve months, one bar each, drawn from the same 2,367 flights. The strip shows how much of this route's record is set by the calendar rather than by the operation.
July is the worst month at 71.3% on time, 12 points below June, the best at 82.8%. 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, Wednesday is the strongest day at 83.6% on time and Sunday the weakest at 72.3%, a spread of 11 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 49% of the 49,000 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Late-arriving aircraft
- 39%Carrier
- 10%National Airspace System
- 2%Extreme weather
- 0%Security
49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 49,000 reported delay minutes here, that single category outweighs weather by 31 to one. The split is drawn from 48,911 reported delay minutes.
The largest share of delay minutes, 39%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 19,000 of the 49,000 delay minutes reported here.
Cancellations sit at 1.73% against a national 1.89%, which is ordinary. Diversions add another 0.13%.
Connections and stage length
What a delay here actually costs
10.0% 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 71.7% on time across 2,365 flights, 6 points below 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 2,367 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 MIA after this flight
What to do with this
Booking this route
Put together: take the 5am–8am departure, avoid July if the dates are flexible, and if two carriers are within a few dollars of each other, American is the one with the record behind it. None of that guarantees an on-time arrival; it moves the odds by 32 points, which is the most any booking decision can do. 2,323 completed flights over 12 months sit behind that.
Common questions
RDU to MIA questions
How often is RDU to MIA delayed?
Roughly 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 22.2% of the 2,367 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
How reliable is RDU to MIA compared with the rest of the country?
77.8% of flights arrive on time here against a national 77.3%, a difference of half a point in its favour. That is worth a B on this site's grading scale.
What time of day has the fewest delays on RDU to MIA?
The 5am–8am departure window is the strongest at 91.6% on time. The 2pm–5pm window is the weakest at 59.6%, 32 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 RDU to MIA?
July is the weakest month at 71.3% on time, compared with 82.8% in June. Across the year that is 12 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
- MIA to RDU — the return legseparate record
- Raleigh-Durham International (RDU) delay statistics
- Miami International (MIA) delay statistics
- Delta Air Lines on RDU to MIA84.2%
- American Airlines on RDU to MIA78.4%
- Envoy Air on RDU to MIA74.3%
- Frontier Airlines on RDU to MIA66.8%
- RDU to ATL, a related route86.5%
- ATL to MIA, a related route71.2%
- RDU to ORD, a related route74.3%
- Delta Air Lines on-time record84.2%
- American Airlines on-time record78.4%
- Envoy Air on-time record74.3%
- Why the first flight of the morning is statistically safest
- How often a connection fails at the major US hubs
Direction matters. RDU to MIA and MIA to RDU 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.