Carrier route record
F9RDU→MIA
Frontier Airlines · Raleigh to Miami
- Flights
- 209
- Period
- September 2025 to August 2026
- Share of route
- 9%
- Carriers
- 5
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on RDU to MIA draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 209 flights, with a median arrival 4 minutes early.
The national on-time rate over the same period is 77.3%, so Frontier on RDU to MIA runs 11 points behind the country as a whole. Across a thousand flights that is about 105 extra late arrivals.
Key figures
On time
66.8%
Arrivals under 15 minutes late, of 202 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
3.35%
National rate is 1.89%
Whole route
77.8%
Every carrier on RDU to MIA, 2,367 flights
These figures cover 209 flights between September 2025 and August 2026. Beyond the headline rate, 14.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
Frontier against every carrier on RDU to MIA
Frontier flew 209 of the 2,367 flights on RDU to MIA, about 9% of it. Its 66.8% on time is 11 points worse than the route as a whole, which runs 77.8%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from Delta at 84.2% to Republic at 58.6%. Three of those carriers flew fewer than 365 flights here, so treat their positions as rough.
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 Airlines (this page)thin sample | 209 | 66.8% | 78 min | 3.35% | C− |
| Republic Airwaysthin sample | 30 | 58.6% | 49 min | 3.33% | D− |
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When Frontier runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 21 points, against half a point between the best and worst carrier.
- 5am–8am1 flights—
- 8am–11am37 flights81.1%
- 11am–2pm18 flights—
- 2pm–5pm49 flights59.6%
- 5pm–8pm89 flights65.9%
- 8pm–5am15 flights—
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 81.1% of the time, against 59.6% for the afternoon window. That is 21 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 89 flights scheduled in it.
Across the year
Frontier on RDU to MIA through the year
- Jul–Sep 20259 flights—
- Oct–Dec 202544 flights62.8%
- Jan–Mar 202648 flights58.1%
- Apr–Jun 202660 flights78.3%
- Jul–Sep 202648 flights59.6%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 66.8% on time across 209 flights.
Frontier on RDU to MIA did not run the same all year. Its best quarter was Apr–Jun 2026 at 78.3% on time and its weakest Jan–Mar 2026 at 58.1%, a swing of 20 points on roughly 52 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
Across the week, Thursday is the strongest day at 73.8% on time and Sunday the weakest at 61.5%, a spread of 12 points.
Arrival by arrival
How late Frontier on RDU to MIA runs when it is late
Frontier on RDU to MIA often beats the schedule: 57 of 202 completed flights, 28%, arrived 15 minutes or more early. The 67 late arrivals split 19 under half an hour, 19 between 30 and 60 minutes, and 29 an hour or more.
- 15+ min early57 flights28.2%
- Within 15 min78 flights38.6%
- 15–29 min late19 flights9.4%
- 30–59 min late19 flights9.4%
- 1–2 hours late21 flights10.4%
- 2+ hours late8 flights4.0%
Scale runs 0% to 100%.
Share of 202 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 63 departures that left 15 minutes late or more, only 7 made it up before arrival. In the other direction, 11 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at MIA.
The worst days
Worst days for Frontier on RDU to MIA
The latest arrival of the period was on 14 May 2026, 9 hours 42 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 May 2026 | 9 hours 42 minutes | Late-arriving aircraft |
| 24 November 2025 | 5 hours 6 minutes | Late-arriving aircraft |
| 16 May 2026 | 4 hours 49 minutes | Carrier |
| 4 January 2026 | 4 hours 43 minutes | Late-arriving aircraft |
| 17 April 2026 | 4 hours 12 minutes | Carrier |
Delay causes
Why Frontier runs late on this route
Late-arriving aircraft accounts for 66% of the 5,255 delay minutes carriers reported here, and the remaining four split what is left.
- 66%Late-arriving aircraft
- 22%Carrier
- 11%National Airspace System
- 1%Extreme weather
66% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,255 reported delay minutes here, that single category outweighs weather by 66 to one. The split is drawn from 5,255 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 81.1% on time here.
Cancellations run at 3.35%, against 1.89% nationally. That is about one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
14.4% 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 74.6% on time across 209 flights, 8 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 8 points of difference.
One caution: this is a thin sample. 209 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Frontier on RDU to MIA
Put together: the delay figures matter less here than the 3.35% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 202 completed flights over 12 months sit behind that.
Related
Where to go next
- RDU to MIA, every carrier
- Frontier on MIA to RDU, the return leg
- Delta Air Lines on RDU to MIA84.2%
- American Airlines on RDU to MIA78.4%
- Envoy Air on RDU to MIA74.3%
- Frontier Airlines network-wide record
- Raleigh-Durham International (RDU) delay statistics
- Miami International (MIA) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
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.