Carrier route record

F9OKC→DEN

Frontier Airlines · Oklahoma City to Denver

Flights: 366
Period: July 2025 to June 2026
Share of route: 12%
Carriers: 4

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

Frontier on OKC to DEN lands a B+, level with the national rate of 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 366 flights. The strongest carrier on the route with a full sample, SkyWest Airlines, flew 1,262 at 81.9% on time.

The US average over the same twelve months is 77.6%, so there is little to separate Frontier on OKC to DEN from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.

On time

77.1%

Arrivals under 15 minutes late, of 363 completed flights

Avg delay

77 min

Across delayed arrivals only, not all flights

Cancelled

0.82%

National rate is 1.81%

Whole route

79.2%

Every carrier on OKC to DEN, 3,167 flights

These figures cover 366 flights between July 2025 and June 2026. Beyond the headline rate, 10.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Carrier by carrier

Frontier against every carrier on OKC to DEN

Frontier flew 366 of the 3,167 flights on OKC to DEN, about 12% of it. Its 77.1% on time is 2 points worse than the route as a whole, which runs 79.2%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from SkyWest at 81.9% to United at 75.2%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The two carriers here are closely matched: 4 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.

On-time performance by carrier on OKC to DEN
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlines	1,262	81.9%	75 min	0.63%	B+
Southwest Airlines	1,223	78.0%	57 min	0.98%	B+
Frontier Airlines (this page)	366	77.1%	77 min	0.82%	B+
United Airlinesthin sample	316	75.2%	37 min	0.63%	B+

No carrier stands out. SkyWest tops the table at 81.9%, 4 points clear of the bottom, which is inside the range this kind of sample moves year to year.

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 29 points, against 4 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am68 flights89.6%
8am–11am16 flights—
11am–2pm22 flights—
2pm–5pm58 flights87.9%
5pm–8pm85 flights60.2%
8pm–5am117 flights76.1%

Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is where this operation falls apart: 60.2% on time, against 89.6% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 8pm–5am window is the busiest, with 117 flights scheduled in it.

Across the year

Frontier on OKC to DEN through the year

Jul–Sep 2025122 flights72.5%
Oct–Dec 202586 flights75.3%
Jan–Mar 202667 flights80.6%
Apr–Jun 202691 flights82.4%

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 77.1% on time across 366 flights.

Quarter by quarter Frontier on OKC to DEN held fairly steady: 72.5% in Jul–Sep 2025, 75.3% in Oct–Dec 2025, 80.6% in Jan–Mar 2026 and 82.4% in Apr–Jun 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Across the week, Tuesday is the strongest day at 93.0% on time and Friday the weakest at 63.1%. 30 points is a smaller lever than departure hour, but it is free.

Delay causes

Why Frontier runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 58% of the 6,382 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
58%
National Airspace System
21%
Carrier
17%
Extreme weather
4%

58% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 6,382 reported delay minutes here, that single category outweighs weather by 16 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 6,382 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 89.6% on time here.

Cancellations are rare at 0.82%, below the national 1.81% 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.2% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

At 495 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.

The return leg runs 75.3% on time across 366 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 366 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 OKC to DEN

Put together: treat all of this as provisional. 366 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 77.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 363 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures