Carrier route record

F9MIA→RDU

Frontier Airlines · Miami to Raleigh

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 MIA to RDU sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 209 flights, with a median arrival 8 minutes early.

The US average over the same twelve months is 77.3%, so there is little to separate Frontier on MIA to RDU from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

74.6%

Arrivals under 15 minutes late, of 205 completed flights

Avg delay

61 min

Across delayed arrivals only, not all flights

Cancelled

1.91%

National rate is 1.89%

Whole route

71.7%

Every carrier on MIA to RDU, 2,365 flights

These figures cover 209 flights between September 2025 and August 2026. Beyond the headline rate, 10.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Carrier by carrier

Frontier against every carrier on MIA to RDU

Frontier flew 209 of the 2,365 flights on MIA to RDU, about 9% of it. Its 74.6% on time is 3 points better than the route as a whole, which runs 71.7%. Ranked by on-time rate it is number two of five carriers on the route, where the range runs from Envoy at 77.7% to Republic at 64.3%. 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.

On-time performance by carrier on MIA to RDU
Airline	Flights	On time	Avg delay	Cancelled	Grade
Envoy Airthin sample	104	77.7%	56 min	0.96%	B+
Frontier Airlines (this page)thin 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−

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 22 points, against half a point between the best and worst carrier.

5am–8am50 flights89.8%
8am–11am23 flights—
11am–2pm38 flights75.0%
2pm–5pm91 flights67.8%
5pm–8pm6 flights—
8pm–5am1 flights—

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 89.8% of the time, against 67.8% for the afternoon window. That is 22 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 91 flights scheduled in it.

Across the year

Frontier on MIA to RDU through the year

Jul–Sep 20259 flights—
Oct–Dec 202544 flights67.4%
Jan–Mar 202648 flights80.4%
Apr–Jun 202660 flights88.3%
Jul–Sep 202648 flights59.6%

Scale runs 50% to 95%. 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 74.6% on time across 209 flights.

Frontier on MIA to RDU did not run the same all year. Its best quarter was Apr–Jun 2026 at 88.3% on time and its weakest Jul–Sep 2026 at 59.6%, a swing of 29 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 86.0% on time and Sunday the weakest at 65.9%, a spread of 20 points.

Arrival by arrival

How late Frontier on MIA to RDU runs when it is late

Frontier on MIA to RDU often beats the schedule: 80 of 205 completed flights, 39%, arrived 15 minutes or more early. The 52 late arrivals split 19 under half an hour, 12 between 30 and 60 minutes, and 21 an hour or more.

15+ min early80 flights39.0%
Within 15 min73 flights35.6%
15–29 min late19 flights9.3%
30–59 min late12 flights5.9%
1–2 hours late16 flights7.8%
2+ hours late5 flights2.4%

Scale runs 0% to 100%.

Share of 205 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 46 departures that left 15 minutes late or more, only 5 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 RDU.

The worst days

Worst days for Frontier on MIA to RDU

The latest arrival of the period was on 24 November 2025, 5 hours 40 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.

The latest arrivals of Frontier on MIA to RDU in the period
Date	Arrived late by	Largest filed cause
24 November 2025	5 hours 40 minutes	Late-arriving aircraft
4 January 2026	4 hours 1 minute	Carrier
8 September 2025	3 hours 18 minutes	Extreme weather
30 July 2026	3 hours 17 minutes	Late-arriving aircraft
24 October 2025	2 hours	Late-arriving aircraft

Delay causes

Why Frontier runs late on this route

Late-arriving aircraft accounts for 56% of the 3,186 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
56%
National Airspace System
22%
Carrier
18%
Extreme weather
4%

56% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,186 reported delay minutes here, that single category outweighs weather by 15 to one. The split is drawn from 3,186 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 89.8% on time here.

Cancellations sit at 1.91% against a national 1.89%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

10.2% 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 66.8% on time across 209 flights, 8 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 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 MIA to RDU

Put together: treat all of this as provisional. 209 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 74.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 205 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures