RDU to MIA flight delays
Raleigh/Durham, NC (RDU) Miami, FL (MIA) · 700 miles
2,350 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
76.77%
Arrived on time
Within 15 minutes of schedule
1.83%
Cancelled
Share of scheduled flights
95 min
When late, late by
Average across delayed arrivals
23 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Which airline you fly changes the odds here. Delta Air Lines arrived on time 10.3 points more often than Frontier Airlines over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The two directions do not behave alike. MIA to RDU arrives on time 5.3 points less often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
The Raleigh/Durham to Miami route sits close to the middle of the record — neither notably punctual nor notably late.
Which airline should you fly on this route?
Over January 2025 – August 2026, Delta Air Lines arrived on time most often on RDU to MIA. Frontier Airlines was late most often. Flights ran closest to schedule in June and worst in July.
Every airline on RDU to MIA
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| American Airlines | 1,705 | 77.17% | 1.64% | 102 min | C |
| Delta Air Lines | 360 | 80.51% | 1.67% | 82 min | C |
| Frontier Airlines | 185 | 70.22% | 3.78% | 89 min | F |
| Envoy Air | 70 | 72.46% | 1.43% | 55 min | — |
| Republic Airways | 30 | 58.62% | 3.33% | 49 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
MIA to RDU Miami back to Raleigh/Durham 71.42% on time DOther routes from Raleigh/Durham
Common questions
Are flights from Raleigh/Durham to Miami usually delayed?
76.77% of flights on the RDU to MIA route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airline is most on time from Raleigh/Durham to Miami?
Delta Air Lines, at 80.51% on time across 360 flights. The least punctual on the route was Frontier Airlines at 70.22%.
How often are RDU to MIA flights cancelled?
1.83% of scheduled flights did not operate — about 18 in every thousand. That is in the normal range.
What is the best month to fly Raleigh/Durham to Miami?
June, when 82.8% of flights arrived on time. The worst was July at 68.8%.
When RDU to MIA flights are late, how late are they?
About 95 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on RDU to MIA during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →