Flight number record
F9 2818
Frontier Airlines · San Diego to Denver
- Route
- SAN → DEN
- Departs
- 06:25
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 2818, check with Frontier Airlines.
F9 2818 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 362 flights, with a median arrival 12 minutes early.
Set against the rest of the country, F9 2818's record is 9 points better than the US average of 77.3%. That gap is worth roughly 86 fewer late arrivals for every thousand flights.
Key figures
On time
85.9%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
92 min
Across delayed arrivals only, not all flights
Cancelled
1.66%
National rate is 1.89%
1 hour+ late
5.9%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. The median arrival is 12 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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Schedule
When F9 2818 flies
F9 2818 flies SAN to DEN without a single fixed slot. Its most common scheduled departure was 06:25, used on 214 of 362 flights.
- Departs 06:25214 flights59.1%
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 06:25 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and F9 2818 runs 3 points worse at 85.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
F9 2818 next to SAN to DEN
Every carrier on SAN to DEN combined arrived on time 78.4% of the time across 6,134 flights, so F9 2818 is 8 points ahead of it. Frontier flew 702 flights on the same city pair under all its flight numbers, including this one, and those ran 81.4% on time. Across its whole network Frontier Airlines managed 72.7%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 2818thin sample | 362 | 85.9% | 92 min | 1.66% | A |
| All Frontier Airlines on SAN–DEN | 702 | 81.4% | 87 min | 1.99% | B |
| All carriers on SAN–DEN | 6,134 | 78.4% | 63 min | 1.03% | B |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 2818 quarter by quarter
Quarter by quarter F9 2818 held fairly steady: 86.7% in Jul–Sep 2025, 84.6% in Oct–Dec 2025, 82.4% in Jan–Mar 2026, 86.7% in Apr–Jun 2026 and 91.5% in Jul–Sep 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights86.7%
- Oct–Dec 202592 flights84.6%
- Jan–Mar 202687 flights82.4%
- Apr–Jun 202691 flights86.7%
- Jul–Sep 202662 flights91.5%
Scale runs 75% to 95%.
By weekday, F9 2818 did best on Monday at 92.3% on time and worst on Thursday at 78.8%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 2818 runs when it is late
F9 2818 often beats the schedule: 163 of 355 completed flights, 46%, arrived 15 minutes or more early. The 50 late arrivals split 15 under half an hour, 14 between 30 and 60 minutes, and 21 an hour or more.
- 15+ min early163 flights45.9%
- Within 15 min142 flights40.0%
- 15–29 min late15 flights4.2%
- 30–59 min late14 flights3.9%
- 1–2 hours late11 flights3.1%
- 2+ hours late10 flights2.8%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 39 departures that left 15 minutes late or more, only 1 made it up before arrival. 12 flights left on time and still arrived late.
The worst days
Worst days for F9 2818
The latest arrival of the period was on 21 March 2026, 8 hours 27 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.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 March 2026 | 8 hours 27 minutes | Carrier |
| 11 May 2026 | 6 hours 53 minutes | Late-arriving aircraft |
| 6 June 2026 | 6 hours 35 minutes | Late-arriving aircraft |
| 23 February 2026 | 4 hours 50 minutes | Carrier |
| 14 June 2026 | 4 hours 13 minutes | Late-arriving aircraft |
Delay causes
Why F9 2818 runs late
Carrier accounts for 46% of the 4,609 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Carrier
- 34%Late-arriving aircraft
- 16%National Airspace System
- 4%Extreme weather
The largest share of delay minutes, 46%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,139 of the 4,609 delay minutes reported here. The split is drawn from 4,609 delay minutes reported on F9 2818.
Cancellations sit at 1.66% against a national 1.89%, which is ordinary. Diversions add another 0.28%.
Connections and routes
What a delay on this flight costs
5.9% 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 an hour and a half, which a normal layover absorbs.
The 853 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 362 flights under F9 2818 in the data flew SAN 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. 362 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 2818
For a booking, read F9 2818 as 85.9% on time with 1.66% cancelled over 362 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SAN to DEN, every carrier and departure
- DEN to SAN, the return direction
- United Airlines 2476 on the same route88.7%
- United Airlines 682 on the same route73.9%
- United Airlines 1337 on the same route89.4%
- United Airlines 519 on the same route86.3%
- San Diego International (SAN) 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.