Flight number record
F9 2631
Frontier Airlines · Dallas-Fort Worth to Denver
- Route
- DFW → DEN
- Departs
- 18:58
- Flights
- 276
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 2631, check with Frontier Airlines.
F9 2631 sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 276 flights, with a median arrival 9 minutes early.
Key figures
On time
73.7%
Arrivals under 15 minutes late, of 274 completed flights
Avg delay
98 min
Across delayed arrivals only, not all flights
Cancelled
0.72%
National rate is 1.89%
1 hour+ late
11.7%
National rate is 8.3%
These figures cover 276 flights between September 2025 and August 2026. Beyond the headline rate, 11.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 2631 flies
F9 2631 flies DFW to DEN without a single fixed slot. Its most common scheduled departure was 18:58, used on 30 of 276 flights.
- Departs 18:5830 flights10.9%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 18:58 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and F9 2631 runs 6 points better at 73.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
F9 2631 next to DFW to DEN
Every carrier on DFW to DEN combined arrived on time 70.5% of the time across 6,059 flights, so F9 2631 is 3 points ahead of it. Frontier flew 1,201 flights on the same city pair under all its flight numbers, including this one, and those ran 77.3% on time. Across its whole network Frontier Airlines managed 72.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 2631thin sample | 276 | 73.7% | 98 min | 0.72% | C+ |
| All Frontier Airlines on DFW–DEN | 1,201 | 77.3% | 88 min | 1.08% | B |
| All carriers on DFW–DEN | 6,059 | 70.5% | 75 min | 1.93% | C |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 2631 quarter by quarter
F9 2631 did not run the same all year. Its best quarter was Oct–Dec 2025 at 80.0% on time and its weakest Jul–Sep 2026 at 52.5%, a swing of 28 points on roughly 69 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.
- Jul–Sep 202523 flights—
- Oct–Dec 202570 flights80.0%
- Jan–Mar 202676 flights76.0%
- Apr–Jun 202666 flights71.2%
- Jul–Sep 202641 flights52.5%
Scale runs 45% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, F9 2631 did best on Sunday at 83.8% on time and worst on Monday at 63.0%. Each day rests on about 39 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 2631 runs when it is late
F9 2631 often beats the schedule: 98 of 274 completed flights, 36%, arrived 15 minutes or more early. The 72 late arrivals split 16 under half an hour, 24 between 30 and 60 minutes, and 32 an hour or more.
- 15+ min early98 flights35.8%
- Within 15 min104 flights38.0%
- 15–29 min late16 flights5.8%
- 30–59 min late24 flights8.8%
- 1–2 hours late17 flights6.2%
- 2+ hours late15 flights5.5%
Scale runs 0% to 100%.
Share of 274 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 73 departures that left 15 minutes late or more, only 7 made it up before arrival. 6 flights left on time and still arrived late.
The worst days
Worst days for F9 2631
The latest arrival of the period was on 9 November 2025, 12 hours 57 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 9 November 2025 | 12 hours 57 minutes | Late-arriving aircraft |
| 8 August 2026 | 6 hours 41 minutes | Late-arriving aircraft |
| 3 March 2026 | 6 hours 1 minute | Late-arriving aircraft |
| 19 January 2026 | 5 hours 55 minutes | Late-arriving aircraft |
| 25 July 2026 | 5 hours 30 minutes | Late-arriving aircraft |
Delay causes
Why F9 2631 runs late
Late-arriving aircraft accounts for 64% of the 7,021 delay minutes carriers reported here, and the remaining four split what is left.
- 64%Late-arriving aircraft
- 26%National Airspace System
- 8%Carrier
- 2%Extreme weather
64% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,021 reported delay minutes here, that single category outweighs weather by 34 to one. The split is drawn from 7,021 delay minutes reported on F9 2631.
Cancellations are rare at 0.72%, below the national 1.89% 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 routes
What a delay on this flight costs
11.7% 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 641 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.
Every one of the 276 flights under F9 2631 in the data flew DFW to DEN. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 276 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 F9 2631
For a booking, read F9 2631 as 73.7% on time with 0.72% cancelled over 276 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DFW to DEN, every carrier and departure
- DEN to DFW, the return direction
- American Airlines 420 on the same route74.7%
- American Airlines 1832 on the same route60.0%
- Frontier Airlines 2147 on the same route90.7%
- American Airlines 1322 on the same route47.4%
- American Airlines 577 on the same route51.3%
- United Airlines 248 on the same route81.8%
- Dallas/Fort Worth International (DFW) delay statistics
- Denver International (DEN) delay statistics
- Frontier Airlines on-time record
- Every Frontier Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Frontier Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.