Carrier route record
F9DFW→STL
Frontier Airlines · Dallas-Fort Worth to St. Louis
- 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 DFW to STL earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 107 flights, with a median arrival 11 minutes early.
Set against the rest of the country, Frontier's DFW to STL record is 8 points better than the US average of 77.3%. That gap is worth roughly 77 fewer late arrivals for every thousand flights.
Key figures
On time
85.0%
Arrivals under 15 minutes late, of 107 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
Whole route
69.7%
Every carrier on DFW to STL, 2,392 flights
These figures cover 107 flights between September 2025 and August 2026. The median arrival is 11 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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 DFW to STL
Frontier flew 107 of the 2,392 flights on DFW to STL, about 4% of it. Its 85.0% on time is 15 points better than the route as a whole, which runs 69.7%. Ranked by on-time rate it is number two of five carriers on the route, where the range runs from Envoy at 89.3% to American at 66.1%. 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 |
|---|---|---|---|---|---|
| Envoy Airthin sample | 242 | 89.3% | 46 min | 2.89% | A |
| Frontier Airlines (this page)thin sample | 107 | 85.0% | 64 min | 0.00% | A+ |
| SkyWest Airlinesthin sample | 52 | 72.5% | 49 min | 1.92% | C |
| PSA Airlinesthin sample | 114 | 72.2% | 57 min | 4.39% | C− |
| American Airlines | 1,877 | 66.1% | 84 min | 2.98% | 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–8am9 flights—
- 8am–11am12 flights—
- 11am–2pm41 flights82.9%
- 2pm–5pm43 flights83.7%
- 5pm–8pm2 flights—
- 8pm–5am—
Scale runs 75% to 90%. Rows with fewer than 30 flights show a dash.
The 2pm–5pm window is the strongest at 83.7% on time. The full set of windows spans about a point.
Across the year
Frontier on DFW to STL through the year
- Jul–Sep 20258 flights—
- Oct–Dec 202520 flights—
- Apr–Jun 202644 flights88.6%
- Jul–Sep 202635 flights80.0%
Scale runs 70% 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 85.0% on time across 107 flights.
Split by quarter, Frontier on DFW to STL 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 85.0% annual figure is the one to use.
Arrival by arrival
How late Frontier on DFW to STL runs when it is late
Frontier on DFW to STL often beats the schedule: 43 of 107 completed flights, 40%, arrived 15 minutes or more early. Most of the lateness is short. 9 of the 16 late arrivals were under half an hour behind, and 5 reached an hour or more.
- 15+ min early43 flights40.2%
- Within 15 min48 flights44.9%
- 15–29 min late9 flights8.4%
- 30–59 min late2 flights1.9%
- 1–2 hours late3 flights2.8%
- 2+ hours late2 flights1.9%
Scale runs 0% to 100%.
Share of 107 completed flights by arrival against schedule.
Only 18 of 107 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for Frontier on DFW to STL
The latest arrival of the period was on 21 July 2026, 5 hours 41 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 July 2026 | 5 hours 41 minutes | Late-arriving aircraft |
| 7 June 2026 | 2 hours 55 minutes | Late-arriving aircraft |
| 18 July 2026 | 1 hour 28 minutes | Late-arriving aircraft |
| 24 November 2025 | 1 hour 20 minutes | Late-arriving aircraft |
| 6 August 2026 | 1 hour 6 minutes | National Airspace System |
Delay causes
Why Frontier runs late on this route
Late-arriving aircraft accounts for 74% of the 1,027 delay minutes carriers reported here, and the remaining four split what is left.
- 74%Late-arriving aircraft
- 21%Carrier
- 5%National Airspace System
74% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,027 reported delay minutes here, that single category outweighs weather by 74 to one. The split is drawn from 1,027 reported delay minutes.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 4.7% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
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 72.1% on time across 107 flights, 13 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 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 DFW to STL
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 85.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 107 completed flights over 12 months sit behind that.
Related
Where to go next
- DFW to STL, every carrier
- Frontier on STL to DFW, the return leg
- Envoy Air on DFW to STL89.3%
- PSA Airlines on DFW to STL72.2%
- American Airlines on DFW to STL66.1%
- Frontier Airlines network-wide record
- Dallas/Fort Worth International (DFW) delay statistics
- St. Louis Lambert International (STL) delay statistics
- Why the first flight of the morning is statistically safest
- How to read this site: grades, sample sizes, and honest caveats
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.