Carrier route record

F9STL→DFW

Frontier Airlines · St. Louis to Dallas-Fort Worth

Flights: 107
Period: September 2025 to August 2026
Share of route: 4%
Carriers: 5

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

Frontier on STL to DFW sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land about 2.2 hours behind schedule. That rests on 107 flights, with a median arrival 6 minutes early.

The national on-time rate over the same period is 77.3%, so Frontier on STL to DFW runs 5 points behind the country as a whole. Across a thousand flights that is about 52 extra late arrivals.

On time

72.1%

Arrivals under 15 minutes late, of 104 completed flights

Avg delay

134 min

Across delayed arrivals only, not all flights

Cancelled

1.87%

National rate is 1.89%

Whole route

76.2%

Every carrier on STL to DFW, 2,391 flights

These figures cover 107 flights between September 2025 and August 2026. Beyond the headline rate, 9.6% 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 STL to DFW

Frontier flew 107 of the 2,391 flights on STL to DFW, about 4% of it. Its 72.1% on time is 4 points worse than the route as a whole, which runs 76.2%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from Envoy at 82.3% to PSA at 67.3%. 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 STL to DFW
Airline	Flights	On time	Avg delay	Cancelled	Grade
Envoy Airthin sample	240	82.3%	73 min	3.33%	B−
American Airlines	1,878	76.3%	119 min	3.14%	B−
SkyWest Airlinesthin sample	52	73.1%	86 min	0.00%	C+
Frontier Airlines (this page)thin sample	107	72.1%	134 min	1.87%	C
PSA Airlinesthin sample	114	67.3%	106 min	3.51%	C−

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 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 107 flights.

5am–8am—
8am–11am19 flights—
11am–2pm2 flights—
2pm–5pm41 flights69.2%
5pm–8pm43 flights74.4%
8pm–5am2 flights—

Scale runs 60% to 80%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is the strongest at 74.4% on time. The full set of windows spans 5 points.

Across the year

Frontier on STL to DFW through the year

Jul–Sep 20258 flights—
Oct–Dec 202520 flights—
Apr–Jun 202644 flights76.2%
Jul–Sep 202635 flights77.1%

Scale runs 70% 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 72.1% on time across 107 flights.

Split by quarter, Frontier on STL to DFW logged 8 flights in Jul–Sep 2025, 20 flights in Oct–Dec 2025, 44 flights in Apr–Jun 2026 and 35 flights in Jul–Sep 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 72.1% annual figure is the one to use.

Arrival by arrival

How late Frontier on STL to DFW runs when it is late

Frontier on STL to DFW often beats the schedule: 33 of 104 completed flights, 32%, arrived 15 minutes or more early. The 29 late arrivals split 9 under half an hour, 10 between 30 and 60 minutes, and 10 an hour or more.

15+ min early33 flights31.7%
Within 15 min42 flights40.4%
15–29 min late9 flights8.7%
30–59 min late10 flights9.6%
1–2 hours late5 flights4.8%
2+ hours late5 flights4.8%

Scale runs 0% to 100%.

Share of 104 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 24 departures that left 15 minutes late or more, only 2 made it up before arrival. In the other direction, 7 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 DFW.

The worst days

Worst days for Frontier on STL to DFW

The latest arrival of the period was on 12 July 2026, 17 hours 2 minutes behind schedule; most of its delay minutes were filed as extreme weather. Three of the five worst days fell in July 2026.

The latest arrivals of Frontier on STL to DFW in the period
Date	Arrived late by	Largest filed cause
12 July 2026	17 hours 2 minutes	Extreme weather
24 May 2026	12 hours 53 minutes	National Airspace System
7 July 2026	8 hours 39 minutes	National Airspace System
21 July 2026	5 hours 40 minutes	Late-arriving aircraft
7 June 2026	3 hours 35 minutes	Late-arriving aircraft

Delay causes

Why Frontier runs late on this route

National Airspace System accounts for 45% of the 3,885 delay minutes carriers reported here, and the remaining four split what is left.

National Airspace System
45%
Extreme weather
27%
Late-arriving aircraft
23%
Carrier
5%

Extreme weather accounts for 27% 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 4.5 times the usual weather exposure. The split is drawn from 3,885 reported delay minutes.

45% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,729 minutes out of 3,885, against a national NAS share of 21%.

Cancellations sit at 1.87% against a national 1.89%, which is ordinary. Diversions add another 0.93%.

Connections and stage length

What a delay here costs

9.6% 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 550 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 85.0% on time across 107 flights, 13 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 13 points of difference.

One caution: this is a thin sample. 107 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 STL to DFW

Put together: treat all of this as provisional. 107 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 72.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 104 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