Carrier route record

F9MEM→DEN

Frontier Airlines · Memphis to Denver

Flights: 145
Period: September 2025 to August 2026
Share of route: 10%
Carriers: 4

Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Frontier Airlines.

Frontier on MEM to DEN sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 145 flights. The strongest carrier on the route with a full sample, United Airlines, flew 727 at 81.6% on time.

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

On time

75.5%

Arrivals under 15 minutes late, of 143 completed flights

Avg delay

89 min

Across delayed arrivals only, not all flights

Cancelled

0.69%

National rate is 1.89%

Whole route

77.7%

Every carrier on MEM to DEN, 1,395 flights

These figures cover 145 flights between September 2025 and August 2026. Beyond the headline rate, 10.5% 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 MEM to DEN

Frontier flew 145 of the 1,395 flights on MEM to DEN, about 10% of it. Its 75.5% on time is 2 points worse than the route as a whole, which runs 77.7%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from SkyWest at 100.0% to Southwest at 72.8%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. United Airlines arrives on time 81.6% of the time; Southwest Airlines manages 72.8%. Sample sizes sit next to every figure, because a two-point gap across 522 flights means less than a ten-point one.

On-time performance by carrier on MEM to DEN
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlinesthin sample	1	100.0%	—	0.00%	A+
United Airlines	727	81.6%	81 min	0.96%	B+
Frontier Airlines (this page)thin sample	145	75.5%	89 min	0.69%	B+
Southwest Airlines	522	72.8%	58 min	0.57%	C+

United leads Southwest by 9 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

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Departure window

When Frontier runs best on this route

Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 145 flights.

There are not enough flights in each departure window to split Frontier's MEM to DEN record by time of day without the percentages moving on noise. The headline rate of 75.5% is the reliable figure here.

Across the year

Frontier on MEM to DEN through the year

Jul–Sep 202512 flights—
Oct–Dec 202539 flights82.1%
Jan–Mar 202637 flights72.2%
Apr–Jun 202632 flights84.4%
Jul–Sep 202625 flights—

Scale runs 65% to 90%. 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 75.5% on time across 145 flights.

Frontier on MEM to DEN did not run the same all year. Its best quarter was Apr–Jun 2026 at 84.4% on time and its weakest Jan–Mar 2026 at 72.2%, a swing of 12 points on roughly 48 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, Sunday is the strongest day at 81.8% on time and Thursday the weakest at 71.0%, a spread of 11 points.

Arrival by arrival

How late Frontier on MEM to DEN runs when it is late

Frontier on MEM to DEN often beats the schedule: 45 of 143 completed flights, 31%, arrived 15 minutes or more early. The 35 late arrivals split 12 under half an hour, 8 between 30 and 60 minutes, and 15 an hour or more.

15+ min early45 flights31.5%
Within 15 min63 flights44.1%
15–29 min late12 flights8.4%
30–59 min late8 flights5.6%
1–2 hours late9 flights6.3%
2+ hours late6 flights4.2%

Scale runs 0% to 100%.

Share of 143 completed flights by arrival against schedule.

5 of 33 late departures made up the time and arrived on time, 15% of them. 7 flights left on time and still arrived late.

The worst days

Worst days for Frontier on MEM to DEN

The latest arrival of the period was on 6 October 2025, 16 hours 26 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as a late-arriving aircraft.

The latest arrivals of Frontier on MEM to DEN in the period
Date	Arrived late by	Largest filed cause
6 October 2025	16 hours 26 minutes	Extreme weather
7 August 2026	3 hours 55 minutes	Carrier
19 March 2026	2 hours 40 minutes	Late-arriving aircraft
14 August 2026	2 hours 25 minutes	Late-arriving aircraft
29 July 2026	2 hours 23 minutes	Late-arriving aircraft

Delay causes

Why Frontier runs late on this route

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,123 reported delay minutes.

Extreme weather
34%
Late-arriving aircraft
33%
National Airspace System
19%
Carrier
14%

Extreme weather accounts for 34% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 5.7 times the usual weather exposure. The split is drawn from 3,123 reported delay minutes.

Cancellations are rare at 0.69%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and stage length

What a delay here costs

10.5% 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 872 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 84.7% on time across 145 flights, 9 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 9 points of difference.

One caution: this is a thin sample. 145 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 MEM to DEN

Put together: treat all of this as provisional. 145 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 75.5% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 143 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