Carrier performance at one airport

F9→PHX

Frontier Airlines at Phoenix Sky Harbor International

Departures: 7,636
Period: September 2025 to August 2026
Routes: 25
Rank here: #6 of 9

Frontier Airlines at Phoenix lands a B, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 7,636 flights, of which Delta Air Lines flew 10,637 at 86.1% on time.

Measured against the airport rather than the country, Frontier Airlines runs about a point ahead of the 77.9% weighted average across all carriers at PHX. That is the comparison worth making: every operator here works the same runways, the same airspace and the same weather.

On time

78.9%

7,525 completed departures

Avg delay

82 min

Across delayed flights only

Cancelled

1.18%

At PHX, this carrier only

Rank here

Of 9 carriers clearing the floor at PHX

These figures cover 7,636 flights between September 2025 and August 2026. Beyond the headline rate, 8.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

Against the competition

Every carrier at PHX, ranked

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 86.1% of the time; JetBlue Airways manages 70.2%. Sample sizes sit next to every figure, because a two-point gap across 1,102 flights means less than a ten-point one.

On-time performance of all carriers departing PHX
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines	10,637	86.1%	86 min	1.14%	A
Alaska Airlines	5,685	84.9%	54 min	0.62%	B+
Envoy Air	11,150	84.0%	50 min	0.61%	B+
SkyWest Airlines	27,507	80.3%	78 min	0.84%	B+
United Airlines	10,074	80.3%	77 min	0.78%	B+
Frontier Airlines (this page)	7,636	78.9%	82 min	1.18%	B
American Airlines	56,697	78.5%	71 min	1.13%	B
Southwest Airlines	66,973	73.2%	49 min	0.61%	C+
JetBlue Airways	1,102	70.2%	77 min	3.27%	C−

JetBlue Airways cancels 3.3% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.

Route by route

Where Frontier Airlines flies from PHX

Frontier Airlines operates 25 routes out of PHX with enough volume to report. Route records inside one carrier at one airport still spread widely, because a short shuttle and a transcontinental have very different exposure to a late inbound.

Frontier Airlines routes from PHX
Route	Flights	On time	Avg delay	Cancelled	Grade
PHX to DEN · Denver	1,494	78.8%	92 min	0.74%	B+
PHX to LAS · Las Vegas	846	79.6%	114 min	1.06%	B
PHX to SLC · Salt Lake City	708	84.8%	67 min	1.27%	B
PHX to DFW · Dallas-Fort Worth	635	79.5%	78 min	1.73%	B
PHX to LAX · Los Angeles	501	82.0%	70 min	1.20%	B
PHX to SAN · San Diego	376	74.5%	80 min	0.53%	C+
PHX to CLE · Clevelandthin sample	328	76.2%	81 min	1.83%	B
PHX to DTW · Detroitthin sample	321	73.7%	92 min	1.56%	C
PHX to IAH · Houstonthin sample	306	80.5%	59 min	0.65%	B+
PHX to SNA · Santa Anathin sample	281	87.0%	54 min	1.07%	A
PHX to SFO · San Franciscothin sample	278	65.8%	64 min	1.08%	C
PHX to ATL · Atlantathin sample	234	72.8%	72 min	2.14%	C
PHX to MCO · Orlandothin sample	208	74.6%	68 min	1.44%	C
PHX to ORD · Chicagothin sample	182	70.5%	104 min	3.85%	C−
PHX to AUS · Austinthin sample	127	87.3%	66 min	0.79%	A+
PHX to SEA · Seattlethin sample	116	83.6%	83 min	0.00%	B+
PHX to CVG · Cincinnatithin sample	110	75.0%	39 min	1.82%	B
PHX to MDW · Chicagothin sample	109	68.2%	88 min	1.83%	C
PHX to MSP · Minneapolisthin sample	82	84.0%	60 min	1.22%	B
PHX to PDX · Portlandthin sample	77	92.2%	79 min	0.00%	A+
PHX to SAT · San Antoniothin sample	65	90.8%	34 min	0.00%	A+
PHX to MCI · Kansas Citythin sample	55	81.8%	46 min	0.00%	B+
PHX to STL · St. Louisthin sample	53	82.7%	170 min	1.89%	B
PHX to GEG · Spokanethin sample	45	68.9%	79 min	0.00%	C+
PHX to RNO · Renothin sample	40	82.1%	86 min	2.50%	B

Flight by flight

Frontier Airlines flight numbers from PHX

4 Frontier Airlines flight numbers leaving PHX flew their main route often enough to have a record of their own. Grouped by destination.

Departure window

Best time of day for this operation

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 20 points, against 16 points between the best and worst carrier.

5am–8am1,485 flights89.5%
8am–11am1,330 flights83.9%
11am–2pm1,413 flights82.4%
2pm–5pm1,422 flights71.8%
5pm–8pm1,021 flights69.7%
8pm–5am965 flights70.8%

Scale runs 60% to 95%.

Book the early departure. Flights leaving between 5am–8am arrive on time 89.5% of the time, against 69.7% for the evening window. That is 20 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 1,485 flights scheduled in it.

Across the year

Seasonal pattern

Darker means more delays. Figures are on-time percentages.February best, August worst

August is the worst month at 71.2% on time, 15 points below February, the best at 86.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. March was the busiest month here, with 952 flights.

Delay causes

What holds this operation up

Late-arriving aircraft
47%
Carrier
30%
National Airspace System
20%
Extreme weather
4%

47% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 130,000 reported delay minutes here, that single category outweighs weather by 13 to one. The split is drawn from 129,685 reported delay minutes.

Cancellations sit at 1.18% against a national 1.89%, which is ordinary. Diversions add another 0.28%.

8.1% 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 a little over an hour, which a normal layover absorbs.

The sample behind these figures is 7,636 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.

Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 86.5% on time and August 71.2%, a swing of 15 points. If the dates move at all, move them out of August before you think about anything else. 7,525 completed flights over 12 months sit behind that.

Common questions

Frontier Airlines at PHX

How often is Frontier Airlines at PHX delayed?

About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 21.1% of the 7,636 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.

Which airline is most reliable on Frontier Airlines at PHX?

Delta Air Lines leads at 86.1% on time across 10,637 flights. JetBlue Airways is at the other end on 70.2%, a gap of 16 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.

What time of day has the fewest delays on Frontier Airlines at PHX?

The 5am–8am departure window is the strongest at 89.5% on time. The 5pm–8pm window is the weakest at 69.7%, 20 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.

How bad are August delays on Frontier Airlines at PHX?

August is the weakest month at 71.2% on time, compared with 86.5% in February. Across the year that is 15 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures