Flight number record

F9 2818

Frontier Airlines · San Diego to Denver

Route: SAN → DEN
Departs: 06:25
Flights: 362
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 2818, check with Frontier Airlines.

F9 2818 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 362 flights, with a median arrival 10 minutes early.

Set against the rest of the country, F9 2818's record is 7 points better than the US average of 77.6%. That gap is worth roughly 68 fewer late arrivals for every thousand flights.

On time

84.4%

Arrivals under 15 minutes late, of 358 completed flights

Avg delay

93 min

Across delayed arrivals only, not all flights

Cancelled

0.83%

National rate is 1.81%

1 hour+ late

6.7%

National rate is 8.1%

These figures cover 362 flights between July 2025 and June 2026. The median arrival is 10 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 2818 flies

F9 2818 flies SAN to DEN without a single fixed slot. Its most common scheduled departure was 06:25, used on 212 of 362 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:25212 flights58.6%

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 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 5 points worse at 84.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

F9 2818 next to SAN to DEN

Every carrier on SAN to DEN combined arrived on time 79.2% of the time across 5,947 flights, so F9 2818 is 5 points ahead of it. Frontier flew 704 flights on the same city pair under all its flight numbers, including this one, and those ran 81.6% on time. Across its whole network Frontier Airlines managed 73.2%, which this flight beats by 11 points.

F9 2818 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 2818thin sample	362	84.4%	93 min	0.83%	B+
All Frontier Airlines on SAN–DEN	704	81.6%	79 min	1.28%	B
All carriers on SAN–DEN	5,947	79.2%	60 min	0.89%	B+
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	C

Across the year

F9 2818 quarter by quarter

Quarter by quarter F9 2818 held fairly steady: 83.7% in Jul–Sep 2025, 84.6% in Oct–Dec 2025, 82.4% in Jan–Mar 2026 and 86.7% in Apr–Jun 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights83.7%
Oct–Dec 202592 flights84.6%
Jan–Mar 202687 flights82.4%
Apr–Jun 202691 flights86.7%

Scale runs 75% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, F9 2818 did best on Monday at 90.4% on time and worst on Saturday at 77.1%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 2818 runs late

One category carries most of the weight here. Carrier accounts for 49% of the 5,204 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.

Carrier
49%
Late-arriving aircraft
31%
National Airspace System
15%
Extreme weather
5%

The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,553 of the 5,204 delay minutes reported here. The split is drawn from 5,204 delay minutes reported on F9 2818.

Cancellations are rare at 0.83%, 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

6.7% 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 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. 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 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 84.4% on time with 0.83% cancelled over 362 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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.

Key figures