Carrier route record

F9ONT→DFW

Frontier Airlines · Ontario to Dallas-Fort Worth

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 ONT to DFW sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 334 flights, with a median arrival 4 minutes early.

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

On time

74.8%

Arrivals under 15 minutes late, of 329 completed flights

Avg delay

64 min

Across delayed arrivals only, not all flights

Cancelled

1.50%

National rate is 1.89%

Whole route

80.8%

Every carrier on ONT to DFW, 2,274 flights

These figures cover 334 flights between September 2025 and August 2026. Beyond the headline rate, 8.2% 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 ONT to DFW

Frontier flew 334 of the 2,274 flights on ONT to DFW, about 15% of it. Its 74.8% on time is 6 points worse than the route as a whole, which runs 80.8%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from American at 81.9% to Frontier at 74.8%.

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 ONT to DFW
Airline	Flights	On time	Avg delay	Cancelled	Grade
American Airlines	1,940	81.9%	104 min	2.58%	B
Frontier Airlines (this page)thin sample	334	74.8%	64 min	1.50%	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 334 flights.

5am–8am13 flights—
8am–11am159 flights76.1%
11am–2pm20 flights—
2pm–5pm63 flights72.6%
5pm–8pm77 flights68.8%
8pm–5am2 flights—

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

The early departures do better, though not dramatically: 76.1% on time for the 8am–11am window against 68.8% for 5pm–8pm. Worth taking if the schedule allows, not worth an extra connection. The 8am–11am window is the busiest, with 159 flights scheduled in it.

Across the year

Frontier on ONT to DFW through the year

Jul–Sep 202524 flights—
Oct–Dec 202589 flights75.3%
Jan–Mar 202668 flights67.6%
Apr–Jun 202691 flights82.4%
Jul–Sep 202662 flights75.4%

Scale runs 60% 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 74.8% on time across 334 flights.

Frontier on ONT to DFW did not run the same all year. Its best quarter was Apr–Jun 2026 at 82.4% on time and its weakest Jan–Mar 2026 at 67.6%, a swing of 15 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 86.0% on time and Sunday the weakest at 66.7%, a spread of 19 points.

Arrival by arrival

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

Frontier on ONT to DFW often beats the schedule: 100 of 329 completed flights, 30%, arrived 15 minutes or more early. The 83 late arrivals split 37 under half an hour, 19 between 30 and 60 minutes, and 27 an hour or more.

15+ min early100 flights30.4%
Within 15 min146 flights44.4%
15–29 min late37 flights11.2%
30–59 min late19 flights5.8%
1–2 hours late18 flights5.5%
2+ hours late9 flights2.7%

Scale runs 0% to 100%.

Share of 329 completed flights by arrival against schedule.

A late pushback is often recovered here: of 67 departures that left 15 minutes late or more, 22 still arrived on time. In the other direction, 38 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 ONT to DFW

The latest arrival of the period was on 3 November 2025, 11 hours 10 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.

The latest arrivals of Frontier on ONT to DFW in the period
Date	Arrived late by	Largest filed cause
3 November 2025	11 hours 10 minutes	Carrier
9 January 2026	5 hours 44 minutes	Late-arriving aircraft
7 March 2026	3 hours 38 minutes	Late-arriving aircraft
26 January 2026	3 hours 14 minutes	National Airspace System
6 April 2026	3 hours 14 minutes	Late-arriving aircraft

Delay causes

Why Frontier runs late on this route

Late-arriving aircraft accounts for 50% of the 5,340 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
50%
National Airspace System
33%
Carrier
17%

50% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,340 reported delay minutes here, that single category outweighs weather by 50 to one. The split is drawn from 5,340 reported delay minutes.

33% 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 1,740 minutes out of 5,340, against a national NAS share of 21%.

Cancellations sit at 1.50% against a national 1.89%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

8.2% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

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 83.3% on time across 334 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. 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 ONT to DFW

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 74.8% 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.

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