Carrier route record
F9DFW→ONT
Frontier Airlines · Dallas-Fort Worth to Ontario
- Flights
- 334
- Period
- September 2025 to August 2026
- Share of route
- 15%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on DFW to ONT lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 334 flights, with a median arrival 10 minutes early.
Set against the rest of the country, Frontier's DFW to ONT record is 6 points better than the US average of 77.3%. That gap is worth roughly 60 fewer late arrivals for every thousand flights.
Key figures
On time
83.3%
Arrivals under 15 minutes late, of 329 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
1.20%
National rate is 1.89%
Whole route
71.7%
Every carrier on DFW to ONT, 2,274 flights
These figures cover 334 flights between September 2025 and August 2026. The median arrival is 10 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.
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Carrier by carrier
Frontier against every carrier on DFW to ONT
Frontier flew 334 of the 2,274 flights on DFW to ONT, about 15% of it. Its 83.3% on time is 12 points better than the route as a whole, which runs 71.7%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from Frontier at 83.3% to American at 69.7%.
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 |
|---|---|---|---|---|---|
| Frontier Airlines (this page)thin sample | 334 | 83.3% | 58 min | 1.20% | B |
| American Airlines | 1,940 | 69.7% | 66 min | 2.42% | 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 matters more here than the choice of carrier. The gap between the best and worst window is 21 points, against half a point between the best and worst carrier.
- 5am–8am110 flights90.7%
- 8am–11am20 flights—
- 11am–2pm34 flights93.9%
- 2pm–5pm100 flights75.8%
- 5pm–8pm59 flights72.9%
- 8pm–5am11 flights—
Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 93.9% on time, ahead of 5pm–8pm at 72.9%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 5am–8am window is the busiest, with 110 flights scheduled in it.
Across the year
Frontier on DFW to ONT through the year
- Jul–Sep 202524 flights—
- Oct–Dec 202589 flights83.7%
- Jan–Mar 202668 flights91.0%
- Apr–Jun 202691 flights73.3%
- Jul–Sep 202662 flights88.7%
Scale runs 65% 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 83.3% on time across 334 flights.
Frontier on DFW to ONT did not run the same all year. Its best quarter was Jan–Mar 2026 at 91.0% on time and its weakest Apr–Jun 2026 at 73.3%, a swing of 18 points on roughly 84 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, Friday is the strongest day at 92.0% on time and Sunday the weakest at 76.2%, a spread of 16 points.
Arrival by arrival
How late Frontier on DFW to ONT runs when it is late
Frontier on DFW to ONT often beats the schedule: 127 of 329 completed flights, 39%, arrived 15 minutes or more early. The 55 late arrivals split 18 under half an hour, 21 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early127 flights38.6%
- Within 15 min147 flights44.7%
- 15–29 min late18 flights5.5%
- 30–59 min late21 flights6.4%
- 1–2 hours late11 flights3.3%
- 2+ hours late5 flights1.5%
Scale runs 0% to 100%.
Share of 329 completed flights by arrival against schedule.
18 of 63 late departures made up the time and arrived on time, 29% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for Frontier on DFW to ONT
The latest arrival of the period was on 6 April 2026, 3 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 |
|---|---|---|
| 6 April 2026 | 3 hours 41 minutes | Late-arriving aircraft |
| 19 May 2026 | 3 hours 40 minutes | Late-arriving aircraft |
| 19 June 2026 | 2 hours 44 minutes | Late-arriving aircraft |
| 2 June 2026 | 2 hours 36 minutes | Late-arriving aircraft |
| 7 December 2025 | 2 hours 7 minutes | Carrier |
Delay causes
Why Frontier runs late on this route
Late-arriving aircraft accounts for 56% of the 3,164 delay minutes carriers reported here, and the remaining four split what is left.
- 56%Late-arriving aircraft
- 25%Carrier
- 14%National Airspace System
- 5%Extreme weather
56% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,164 reported delay minutes here, that single category outweighs weather by 11 to one. The split is drawn from 3,164 reported delay minutes.
Cancellations sit at 1.20% against a national 1.89%, which is ordinary. Diversions add another 0.30%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 4.9% 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 1,188 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 74.8% on time across 334 flights, 9 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 9 points of difference.
One caution: this is a thin sample. 334 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 ONT
Put together: treat all of this as provisional. 334 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 83.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 329 completed flights over 12 months sit behind that.
Related
Where to go next
- DFW to ONT, every carrier
- Frontier on ONT to DFW, the return leg
- American Airlines on DFW to ONT69.7%
- Frontier Airlines network-wide record
- Dallas/Fort Worth International (DFW) delay statistics
- Ontario International (ONT) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.