Carrier performance at one airport

F9→PHX

Frontier Airlines at Phoenix Sky Harbor International

Departures: 7,555
Period: June 2025 to May 2026
Routes: 25
Rank here: #7 of 9

Frontier Airlines at Phoenix lands a B, 2 points better than the national rate of 77.4%. About one flight in five arrive 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 7,555 flights, of which Delta Air Lines flew 10,708 at 86.6% on time.

Measured against the airport rather than the country, Frontier Airlines runs half a point behind the 79.1% 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

79.0%

7,437 completed departures

Avg delay

84 min

Across delayed flights only

Cancelled

1.28%

At PHX, this carrier only

Rank here

Of 9 carriers clearing the floor at PHX

These figures cover 7,555 flights between June 2025 and May 2026. Beyond the headline rate, 8.1% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Against the competition

Every carrier at PHX, ranked

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 86.6% of the time; JetBlue Airways manages 70.6%. Sample sizes sit next to every figure, because a two-point gap across 1,139 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	10,708	86.6%	84 min	1.06%	A
Envoy Air	9,964	85.3%	49 min	0.70%	A+
Alaska Airlines	5,615	85.1%	56 min	0.68%	A+
United Airlines	10,185	81.5%	77 min	0.79%	B+
SkyWest Airlines	27,166	81.3%	78 min	0.80%	B+
American Airlines	56,179	79.4%	70 min	1.13%	B
Frontier Airlines (this page)	7,555	79.0%	84 min	1.28%	B
Southwest Airlines	67,877	75.1%	49 min	0.65%	B+
JetBlue Airways	1,139	70.6%	68 min	2.37%	C

The spread between Delta and JetBlue is 16 points, wide enough that it should decide the booking. On a hundred trips that is 16 more arrivals inside the on-time window.

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	1,394	79.9%	87 min	0.65%	B+
PHX to LAS · Las Vegas	871	82.6%	108 min	1.03%	B
PHX to SLC · Salt Lake City	657	82.7%	80 min	2.13%	B
PHX to DFW · Dallas-Fort Worth	531	78.4%	93 min	1.88%	B
PHX to LAX · Los Angeles	482	83.9%	86 min	1.04%	B
PHX to SAN · San Diego	414	75.4%	84 min	1.45%	B
PHX to CLE · Clevelandthin sample	315	71.4%	85 min	1.59%	C
PHX to DTW · Detroitthin sample	307	75.2%	82 min	1.30%	B
PHX to SNA · Santa Anathin sample	289	86.3%	62 min	1.38%	A
PHX to IAH · Houstonthin sample	265	76.9%	63 min	1.51%	B
PHX to SFO · San Franciscothin sample	254	71.2%	61 min	1.57%	C
PHX to ORD · Chicagothin sample	212	67.5%	116 min	4.25%	C−
PHX to ATL · Atlantathin sample	205	72.3%	70 min	0.98%	C+
PHX to SEA · Seattlethin sample	191	85.3%	81 min	0.00%	A+
PHX to MCO · Orlandothin sample	187	72.7%	61 min	1.60%	C
PHX to AUS · Austinthin sample	177	81.2%	74 min	0.56%	B+
PHX to CVG · Cincinnatithin sample	149	81.5%	39 min	2.01%	B
PHX to MDW · Chicagothin sample	136	66.4%	79 min	1.47%	C
PHX to PDX · Portlandthin sample	106	86.8%	93 min	0.00%	A+
PHX to MSP · Minneapolisthin sample	74	82.2%	60 min	1.35%	B
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

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. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am1,719 flights88.8%
8am–11am1,250 flights83.6%
11am–2pm1,268 flights80.8%
2pm–5pm1,288 flights73.0%
5pm–8pm1,243 flights68.7%
8pm–5am787 flights73.6%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 88.8% of the time, against 68.7% 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.

Across the year

Seasonal pattern

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

June is the worst month at 71.4% 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.

Delay causes

What holds this operation up

Late-arriving aircraft
46%
Carrier
31%
National Airspace System
19%
Extreme weather
4%

46% 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 131,000 reported delay minutes here, that single category outweighs weather by 11 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.

Cancellations sit at 1.28% against a national 1.80%, which is ordinary. Diversions add another 0.28%.

8.1% of arrivals land an hour or more late, close to the national 8.2%. 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 are the an hour and a half kind, which a normal layover absorbs.

The sample behind these figures is 7,555 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 June 71.4%, a swing of 15 points. If the dates move at all, move them out of June before you think about anything else.

Common questions

Frontier Airlines at PHX

How often is Frontier Airlines at PHX delayed?

About one flight in five arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 21.0% of the 7,555 flights in this analysis, against 22.6% nationally. Delayed flights are late by an hour and a half on average.

Which airline is most reliable on Frontier Airlines at PHX?

Delta Air Lines leads at 86.6% on time across 10,708 flights. JetBlue Airways is at the other end on 70.6%, 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 88.8% on time. The 5pm–8pm window is the weakest at 68.7%, 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 June delays on Frontier Airlines at PHX?

June is the weakest month at 71.4% 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, June 2025 to May 2026. Updated monthly. How this data is collected.

Key figures