Flight number record
F9 3600
Frontier Airlines · Denver to Atlanta
- Route
- DEN → ATL
- Departs
- 09:58
- Flights
- 331
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 3600, check with Frontier Airlines.
F9 3600 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 331 flights, with a median arrival 3 minutes early.
The national on-time rate over the same period is 77.3%, so F9 3600 runs 7 points behind the country as a whole. Across a thousand flights that is about 65 extra late arrivals.
Key figures
On time
70.8%
Arrivals under 15 minutes late, of 329 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
0.30%
National rate is 1.89%
1 hour+ late
7.3%
National rate is 8.3%
These figures cover 331 flights between September 2025 and August 2026. The median arrival is 3 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.
Schedule
When F9 3600 flies
F9 3600 flies DEN to ATL without a single fixed slot. Its most common scheduled departure was 09:58, used on 56 of 331 flights, with 13:42 (42 flights) and 10:00 (40 flights) next.
- Departs 09:5856 flights16.9%
- Departs 13:4242 flights12.7%
- Departs 10:0040 flights12.1%
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 09:58 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and F9 3600 runs 13 points worse at 70.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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.
Against the route
F9 3600 next to DEN to ATL
Every carrier on DEN to ATL combined arrived on time 78.6% of the time across 5,603 flights, so F9 3600 is 8 points behind it. Frontier flew 801 flights on the same city pair under all its flight numbers, including this one, and those ran 75.5% on time. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 3600thin sample | 331 | 70.8% | 59 min | 0.30% | C+ |
| All Frontier Airlines on DEN–ATL | 801 | 75.5% | 62 min | 0.87% | B+ |
| All carriers on DEN–ATL | 5,603 | 78.6% | 58 min | 0.93% | B+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 3600 quarter by quarter
F9 3600 did not run the same all year. Its best quarter was Oct–Dec 2025 at 86.9% on time and its weakest Jul–Sep 2026 at 42.6%, a swing of 44 points on roughly 66 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 202530 flights80.0%
- Oct–Dec 202584 flights86.9%
- Jan–Mar 202673 flights73.6%
- Apr–Jun 202682 flights69.5%
- Jul–Sep 202662 flights42.6%
Scale runs 35% to 90%.
By weekday, F9 3600 did best on Sunday at 78.8% on time and worst on Thursday at 62.0%. Each day rests on about 47 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 3600 runs when it is late
F9 3600 often beats the schedule: 105 of 329 completed flights, 32%, arrived 15 minutes or more early. The 96 late arrivals split 30 under half an hour, 42 between 30 and 60 minutes, and 24 an hour or more.
- 15+ min early105 flights31.9%
- Within 15 min128 flights38.9%
- 15–29 min late30 flights9.1%
- 30–59 min late42 flights12.8%
- 1–2 hours late13 flights4.0%
- 2+ hours late11 flights3.3%
Scale runs 0% to 100%.
Share of 329 completed flights by arrival against schedule.
26 of 92 late departures made up the time and arrived on time, 28% of them. In the other direction, 30 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 ATL.
The worst days
Worst days for F9 3600
The latest arrival of the period was on 29 September 2025, 6 hours 33 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 |
|---|---|---|
| 29 September 2025 | 6 hours 33 minutes | Late-arriving aircraft |
| 24 May 2026 | 3 hours 38 minutes | Late-arriving aircraft |
| 26 October 2025 | 3 hours 22 minutes | Late-arriving aircraft |
| 17 March 2026 | 3 hours 14 minutes | Carrier |
| 13 August 2026 | 3 hours 8 minutes | Late-arriving aircraft |
Delay causes
Why F9 3600 runs late
Late-arriving aircraft accounts for 42% of the 5,658 delay minutes carriers reported here, and the remaining four split what is left.
- 42%Late-arriving aircraft
- 31%National Airspace System
- 26%Carrier
- 1%Extreme weather
42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,658 reported delay minutes here, that single category outweighs weather by 42 to one. The split is drawn from 5,658 delay minutes reported on F9 3600.
Cancellations are rare at 0.30%, 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
7.3% 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 1,199 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 331 flights under F9 3600 in the data flew DEN to ATL. 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. 331 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 3600
For a booking, F9 3600 is one of the weaker ways to fly DEN to ATL: 8 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- DEN to ATL, every carrier and departure
- ATL to DEN, the return direction
- Delta Air Lines 341 on the same route93.9%
- Delta Air Lines 431 on the same route93.9%
- United Airlines 1305 on the same route70.9%
- Delta Air Lines 346 on the same route79.2%
- Delta Air Lines 840 on the same route80.7%
- Frontier Airlines 3294 on the same route87.5%
- Denver International (DEN) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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.