Airport month record

PHXAUG

Phoenix Sky Harbor International in August 2025

Departures: 14,380
Month: August 2025
National, same month: 77.4%
Carriers: 10

Historical statistics for August 2025, not live status or a forecast for this year’s August. For today’s conditions at PHX, see live FAA status.

PHX in August lands a B+, 4 points better than the national rate of 77.4%. 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 14,380 flights, of which Delta Air Lines flew 846 at 89.9% on time.

Delta Air Lines is the most reliable of the eight carriers covered here at 89.9% on time across 846 flights.

On time

81.0%

Arrivals under 15 minutes late, of 14,283 completed departures

Avg delay

66 min

Across delayed arrivals only, not all flights

Cancelled

0.39%

Nationally in August: 1.08%

Whole year

78.8%

PHX across all twelve months

These figures cover 14,380 departures from Phoenix Sky Harbor International in August 2025. On time means an arrival less than 15 minutes after the scheduled gate time, the DOT's threshold, and the national comparison uses every US departure in the same month rather than the whole year.

Against the year

August next to PHX's other months

Against PHX's own year, August ran 2 points better than the twelve-month rate of 78.8%, which makes it number four of twelve months, best first. Cancellations were unusually low for PHX in August, at 0.39% against 0.86% across the year. Either side of it, July ran 75.5% on time and September 83.0%, so this month sits in line with its neighbours.

PHX month by month
Month	Flights	On time	Avg delay	Cancelled	Grade
July 2025	15,729	75.5%	70 min	0.97%	B+
August 2025 (this page)	14,380	81.0%	66 min	0.39%	B+
September 2025	13,772	83.0%	74 min	1.09%	B
October 2025	16,620	78.8%	59 min	0.21%	B+
November 2025	16,887	78.0%	63 min	2.21%	B
December 2025	17,689	78.4%	59 min	0.50%	B+
January 2026	16,564	81.6%	64 min	2.34%	B
February 2026	15,656	83.4%	58 min	0.71%	B+
March 2026	19,277	76.8%	65 min	0.92%	B+
April 2026	17,679	80.8%	57 min	0.29%	B+
May 2026	17,337	77.0%	58 min	0.30%	B+
June 2026	15,685	72.4%	65 min	0.43%	C+

Departure window

The best time of day to leave PHX in August

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 20 points, against 14 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am1,893 flights92.2%
8am–11am3,873 flights87.4%
11am–2pm2,197 flights82.7%
2pm–5pm2,547 flights74.0%
5pm–8pm2,324 flights72.5%
8pm–5am1,546 flights72.9%

Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 92.2% of the time, against 72.5% 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 8am–11am window is the busiest, with 3,873 flights scheduled in it.

Across the week, Tuesday is the strongest day at 88.7% on time and Sunday the weakest at 76.9%. 12 points is a smaller lever than departure hour, but it is free.

Carrier by carrier

Which airlines ran best at PHX in August

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 89.9% of the time; Frontier Airlines manages 76.1%. Sample sizes sit next to every figure, because a two-point gap across 526 flights means less than a ten-point one.

Carriers at PHX in August 2025
Airline	Flights	On time	Avg delay	Cancelled	Grade
Southwest Airlines	5,128	79.3%	53 min	0.20%	B+
American Airlines	4,082	78.8%	74 min	0.56%	B+
SkyWest Airlines	1,760	85.9%	73 min	0.06%	A+
Delta Air Lines	846	89.9%	89 min	0.24%	A+
Envoy Air	795	89.2%	52 min	0.00%	A+
United Airlines	726	77.7%	76 min	0.96%	B+
Frontier Airlines	526	76.1%	98 min	1.14%	B
Alaska Airlines	407	79.0%	52 min	1.47%	B
Hawaiian Airlinesthin sample	31	87.1%	288 min	0.00%	A+
JetBlue Airwaysthin sample	31	83.3%	77 min	3.23%	B−

The spread between Delta and Frontier is 14 points, wide enough that it should decide the booking. On a hundred trips that is 14 more arrivals inside the on-time window.

Route by route

Busiest routes out of PHX in August

Routes from PHX in August 2025
Route	Flights	On time	Avg delay	Cancelled	Grade
PHX to LAX · Los Angeles	617	81.8%	72 min	0.00%	B+
PHX to DEN · Denver	613	71.9%	66 min	0.82%	C+
PHX to SEA · Seattle	584	80.2%	49 min	0.51%	B+
PHX to SAN · San Diego	474	79.0%	69 min	0.42%	B+
PHX to LAS · Las Vegas	464	85.0%	57 min	0.86%	A+
PHX to SLC · Salt Lake City	429	85.0%	61 min	0.23%	A+
PHX to ORD · Chicago	416	78.2%	82 min	1.92%	B
PHX to SNA · Santa Ana	367	78.9%	49 min	0.54%	B+
PHX to DFW · Dallas-Fort Worththin sample	363	72.5%	86 min	1.93%	C
PHX to SFO · San Franciscothin sample	341	73.0%	70 min	0.00%	C+
PHX to ATL · Atlantathin sample	301	87.0%	61 min	0.33%	A+
PHX to PDX · Portlandthin sample	272	80.9%	49 min	0.00%	B+
PHX to SMF · Sacramentothin sample	264	82.2%	64 min	0.00%	B+
PHX to MSP · Minneapolisthin sample	251	82.9%	60 min	0.00%	B+
PHX to BUR · Burbankthin sample	249	83.1%	69 min	0.00%	B+
PHX to ABQ · Albuquerquethin sample	247	81.3%	62 min	0.00%	B+
PHX to AUS · Austinthin sample	246	79.8%	54 min	1.22%	B
PHX to TUS · Tucsonthin sample	241	84.2%	81 min	0.00%	B+
PHX to ONT · Ontariothin sample	237	81.4%	70 min	0.00%	B+
PHX to CLT · Charlottethin sample	227	84.5%	41 min	0.44%	B+
PHX to MDW · Chicagothin sample	212	77.1%	63 min	0.47%	B+
PHX to SJC · San Josethin sample	209	78.9%	75 min	0.00%	B+
PHX to RNO · Renothin sample	207	84.5%	71 min	0.00%	B+
PHX to DAL · Dallasthin sample	206	78.3%	55 min	0.49%	B+
PHX to JFK · New Yorkthin sample	203	85.4%	59 min	1.48%	A

Delay causes

What held PHX up in August

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 180,000 reported delay minutes.

Late-arriving aircraft
41%
Carrier
38%
National Airspace System
16%
Extreme weather
4%
Security
0%

41% 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 180,000 reported delay minutes here, that single category outweighs weather by 9 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 180,482 reported delay minutes.

Cancellations are rare at 0.39%, below the national 1.08% 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.

6.2% 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 last about an hour, which a normal layover absorbs.

What to do with this

Flying from PHX in August

For a August trip through PHX: expect 81.0% on time and 0.39% cancelled, going by August 2025. The 5am–8am window was the strongest part of the day.

Phoenix Sky Harbor International (PHX), the whole year
PHX in July75.5%
PHX in September83.0%
PHX in October78.8%
PHX in November78.0%
PHX in December78.4%
PHX in January81.6%
PHX in February83.4%
PHX in March76.8%
PHX in April80.8%
PHX in May77.0%
PHX in June72.4%

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