Route profile
MIA→RDU
Flight reliability, delays and best times to fly from Miami to Raleigh–Durham, 700 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 10% of comparable major US routes (4,598 compared)
Calculated from 7,454 flights. How this is calculated · What counts as on time
MIA → RDU arrives on time 71.1% of the time; the return trip, RDU → MIA, arrives on time 78.1% of the time, a 7.0-point gap between the two directions of the same city pair.
MIA → RDU spends 28.3 minutes on the ground on a 700-mile trip: 21.2 minutes from pushback to wheels-up at MIA and 7.1 minutes from touchdown to gate at RDU.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
This route's worst arrivals run unusually far past its typical one, a bigger gap than 95% of 4,598 comparable routes.
A typical arrival is 3 min early, but the worst tenth run 76 minutes worse than that.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 4,598 in the comparison.
What sets this route apart
Where MIA to RDU differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
MIA to RDU struggles most at 4 PM: 61.1% of its flights scheduled then arrive on time, 8.3 points behind the 69.4% on routes of similar length at the same hour. Against all other routes the gap is 9.6 points.
Friday is the day MIA to RDU slips furthest against routes of similar length, 66.1% on time where they average 75.7%, 9.6 points lower. Against all other routes the gap is 10.1 points.
In August, MIA to RDU runs 17.2 points below routes of similar length, 58.8% on time to 76.0%. Against all other routes the gap is 17.7 points.
Delta Air Lines’ flights on MIA to RDU arrive on time 67.6% of the time, 13.2 points below the 80.8% it manages on its routes of similar length. Against all other routes the gap is 13.9 points.
Envoy Air does better on MIA to RDU than on its routes of similar length: 86.0% on time here, 77.7% there, 8.3 points apart. Against all other routes the gap is 6.9 points.
MIA to RDU against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 4 PM departures | 61.1% | routes of similar length | 69.4% | −8.3 pts | 622 here, 126,081 there |
| Weekday: Friday | 66.1% | routes of similar length | 75.7% | −9.6 pts | 1,085 here, 318,515 there |
| Month: August | 58.8% | routes of similar length | 76.0% | −17.2 pts | 570 here, 177,098 there |
| Airline: Delta Air Lines | 67.6% | routes of similar length | 80.8% | −13.2 pts | 1,097 here, 323,510 there |
| Airline: Envoy Air | 86.0% | routes of similar length | 77.7% | +8.3 pts | 636 here, 36,351 there |
Each comparison pools the flights of other routes, with this route’s own left out. Similar length means within 15% of this route’s 700 miles, with at least 5 such routes. A bucket is set against the most comparable group that has enough flights: similar length, then the same origin (at least 3 routes), then all other routes. Hours, weekdays and months appear only where both sides have 120 completed flights, and airlines where both have 600. The gap must be at least 2 points and 2 standard errors, and only the largest gap each way is kept per measure. These are differences in the flights counted, not causes.
Why MIA → RDU flights are cancelled
July 2023 – July 2026
MIA → RDU cancelled 109 of 7,454 scheduled flights — about 1 in every 68. The reason filed most often was extreme weather, 78.0% of the cancellations coded on this route — about 1 in every 88 scheduled flights.
Share of cancellations
Of 109 cancelled departures carrying a reason code.
What each reason means
Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.
85 cancellations, 78.0% of the total.
Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.
17 cancellations, 15.6% of the total.
Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.
7 cancellations, 6.4% of the total.
A terminal evacuation, a security breach, screening equipment failure, or screening queues over 29 minutes.
0 cancellations, 0.0% of the total.
Reason codes are the operating airline’s own filing with US DOT, not an independent finding of fault. Ordinary bad weather is filed under air traffic, so weather’s full share is larger than its bar.
109 coded cancellations were recorded on MIA → RDU; the section appears from 50.
When it goes wrong
July 2023 – July 2026
73 min late
against a median of 3 min early
MIA → RDU has an average that understates its risk: a typical arrival is 3 min early, but the worst tenth are 76 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 7,454 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at RDU after arriving from MIA.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 44% | Likely to miss |
| 45 min | 28% | High risk |
| 60 min | 20% | High risk |
| 90 min | 12% | Some risk |
| 120 min | 7.4% | Some risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 1.46% of the time and diverts 0.19% of the time, which a late arrival never shows up in.
Chance of missing is the share of 7,331 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 73 minutes late (90th-percentile gate arrival delay), over 7,454 operations.
Any other layover length: connection checker.
Best time to fly
MIA → RDU flights departing 5–9 AM arrived on time 91.1% of the time, against 64.8% for 9 PM–5 AM departures, a gap of 26.3 percentage points.
By departure window
By departure hour
- 12 AM to 6 AM: too few flights to score
- 7 AM: 94.4% on time from 217 flights
- 8 AM: 89.9% on time from 776 flights
- 9 AM: 88.4% on time from 338 flights
- 10 AM to 11 AM: too few flights to score
- 12 PM: 72.4% on time from 130 flights
- 1 PM: 75.7% on time from 158 flights
- 2 PM: 66.6% on time from 593 flights
- 3 PM: 68.7% on time from 511 flights
- 4 PM: 61.1% on time from 636 flights
- 5 PM: 71.1% on time from 518 flights
- 6 PM: 68.2% on time from 1,106 flights
- 7 PM: 64.1% on time from 857 flights
- 8 PM: 60.2% on time from 269 flights
- 9 PM: 64.3% on time from 994 flights
- 10 PM: 68.2% on time from 136 flights
- 11 PM: too few flights to score
Why MIA → RDU runs late
July 2023 – July 2026
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for MIA → RDU. Only delays of 15 minutes or more are attributed. What the five causes mean
Late-arriving aircraft is the largest cause on MIA → RDU, at 47.8%: flights here mostly leave late because the plane came in late, and the day shows it: 5–9 AM departures arrived on time 91.1% of the time and 9 PM–5 AM departures 64.8%.
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| American Airlines | 5,066 | 69.5% | 1.40% | -2 min | 12.8% |
| Delta Air Lines | 1,120 | 67.6% | 1.79% | -2 min | 15.4% |
| Envoy Air | 640 | 86.0% | 0.63% | -7 min | 3.9% |
| Frontier Airlines | 472 | 75.2% | 2.33% | -7 min | 10.2% |
American Airlines flew 69.4% of the 7,298 flights listed. Frontier Airlines cancelled 2.33% of its flights here against 0.63% for Envoy Air.
Envoy Air arrived on time 18.4 percentage points more often than Delta Air Lines on this route.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Sunday the least, a gap of 10.7 percentage points.
By month
- Jan: 72.7%
- Feb: 74.5%
- Mar: 69.8%
- Apr: 78.3%
- May: 72.4%
- Jun: 67.4%
- Jul: 58.8%
- Aug: 58.8%
- Sep: 76.5%
- Oct: 80.6%
- Nov: 79.4%
- Dec: 69.7%
August is historically the weakest month and October the strongest, a spread of 21.8 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 57.8% from 186 flights
- August 2023: 65.2% from 186 flights
- September 2023: 69.4% from 177 flights
- October 2023: 78.9% from 180 flights
- November 2023: 79.7% from 172 flights
- December 2023: 68.9% from 196 flights
- January 2024: 63.5% from 201 flights
- February 2024: 72.6% from 175 flights
- March 2024: 61.2% from 202 flights
- April 2024: 81.5% from 224 flights
- May 2024: 64.2% from 195 flights
- June 2024: 64.2% from 205 flights
- July 2024: 59.9% from 217 flights
- August 2024: 52.3% from 203 flights
- September 2024: 80.7% from 190 flights
- October 2024: 82.5% from 194 flights
- November 2024: 83.1% from 189 flights
- December 2024: 70.6% from 202 flights
- January 2025: 78.3% from 220 flights
- February 2025: 84.7% from 208 flights
- March 2025: 76.9% from 243 flights
- April 2025: 78.7% from 261 flights
- May 2025: 75.9% from 230 flights
- June 2025: 65.7% from 218 flights
- July 2025: 62.3% from 224 flights
- August 2025: 59.1% from 196 flights
- September 2025: 78.9% from 180 flights
- October 2025: 80.3% from 194 flights
- November 2025: 75.4% from 184 flights
- December 2025: 69.5% from 188 flights
- January 2026: 76.0% from 202 flights
- February 2026: 65.0% from 181 flights
- March 2026: 69.5% from 204 flights
- April 2026: 74.0% from 197 flights
- May 2026: 76.2% from 202 flights
- June 2026: 72.4% from 195 flights
- July 2026: 55.1% from 233 flights
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 70.7% against 74.3% in the 12 months before — declining by 3.6 percentage points.
Data and methodology
Calculated by FlyerIntel from 7,454 MIA → RDU flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed