Flight number record
F9 3600
Frontier Airlines · Denver to Atlanta
- Route
- DEN → ATL
- Departs
- 13:39
- Flights
- 330
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s F9 3600, check with Frontier Airlines.
F9 3600 lands a B+, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 330 flights, with a median arrival 7 minutes early.
Key figures
On time
78.7%
Arrivals under 15 minutes late, of 328 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
0.61%
National rate is 1.81%
1 hour+ late
5.5%
National rate is 8.1%
These figures cover 330 flights between July 2025 and June 2026. The median arrival is 7 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.
Schedule
When F9 3600 flies
F9 3600 flies DEN to ATL without a single fixed slot. Its most common scheduled departure was 13:39, used on 44 of 330 flights, with 13:42 (42 flights) and 13:09 (39 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 13:3944 flights13.3%
- Departs 13:4242 flights12.7%
- Departs 13:0939 flights11.8%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 13:39 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and F9 3600 runs level with that at 78.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
F9 3600 next to DEN to ATL
Every carrier on DEN to ATL combined arrived on time 80.0% of the time across 5,596 flights, so F9 3600 is about level with it. Frontier flew 744 flights on the same city pair under all its flight numbers, including this one, and those ran 78.9% on time. Across its whole network Frontier Airlines managed 73.2%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 3600thin sample | 330 | 78.7% | 60 min | 0.61% | B+ |
| All Frontier Airlines on DEN–ATL | 744 | 78.9% | 61 min | 0.81% | B+ |
| All carriers on DEN–ATL | 5,596 | 80.0% | 62 min | 0.86% | B+ |
| Frontier Airlines, whole network | 205,332 | 73.2% | 84 min | 1.85% | 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 Apr–Jun 2026 at 69.5%, a swing of 17 points on roughly 83 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 202591 flights83.3%
- Oct–Dec 202584 flights86.9%
- Jan–Mar 202673 flights73.6%
- Apr–Jun 202682 flights69.5%
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, F9 3600 did best on Wednesday at 90.2% on time and worst on Thursday at 68.0%. Each day rests on about 47 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Delay causes
Why F9 3600 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 44% of the 4,176 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 44%Late-arriving aircraft
- 32%Carrier
- 22%National Airspace System
- 2%Extreme weather
44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,176 reported delay minutes here, that single category outweighs weather by 18 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,176 delay minutes reported on F9 3600.
Cancellations are rare at 0.61%, below the national 1.81% 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
5.5% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
Every one of the 330 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. 330 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, read F9 3600 as 78.7% on time with 0.61% cancelled over 330 flights. Those are rates from the past twelve months, not a forecast for any particular day.
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 route92.8%
- Delta Air Lines 431 on the same route91.6%
- United Airlines 1305 on the same route69.4%
- Delta Air Lines 346 on the same route80.2%
- Delta Air Lines 995 on the same route86.8%
- Delta Air Lines 840 on the same route81.4%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.