Airport month record

PDXAUG

Portland International in August 2025

Departures: 5,685
Month: August 2025
National, same month: 77.4%
Carriers: 11

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

PDX 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 5,685 flights, of which Delta Air Lines flew 702 at 87.5% on time.

Delta Air Lines is the most reliable of the six carriers covered here at 87.5% on time across 702 flights.

On time

80.9%

Arrivals under 15 minutes late, of 5,628 completed departures

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

0.67%

Nationally in August: 1.08%

Whole year

82.6%

PDX across all twelve months

These figures cover 5,685 departures from Portland 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 PDX's other months

Against PDX's own year, August ran 2 points worse than the twelve-month rate of 82.6%, which makes it number nine of twelve months, best first. Either side of it, July ran 75.7% on time and September 83.7%, so this month sits in line with its neighbours.

PDX month by month
Month	Flights	On time	Avg delay	Cancelled	Grade
July 2025	5,864	75.7%	65 min	1.18%	B
August 2025 (this page)	5,685	80.9%	60 min	0.67%	B+
September 2025	5,269	83.7%	51 min	0.17%	B+
October 2025	5,493	82.1%	53 min	0.64%	B+
November 2025	4,976	84.2%	59 min	1.51%	B
December 2025	5,124	79.3%	59 min	0.60%	B+
January 2026	4,537	85.6%	66 min	1.41%	A
February 2026	4,182	86.3%	56 min	0.69%	A+
March 2026	5,113	86.3%	69 min	0.94%	A+
April 2026	5,040	86.1%	63 min	0.48%	A+
May 2026	5,535	83.9%	62 min	0.42%	B+
June 2026	6,024	80.3%	65 min	0.61%	B+

Departure window

The best time of day to leave PDX in August

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 11 points, against 12 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am1,252 flights87.4%
8am–11am994 flights82.6%
11am–2pm903 flights77.0%
2pm–5pm875 flights76.6%
5pm–8pm939 flights76.4%
8pm–5am722 flights83.5%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 87.4% of the time, against 76.4% for the evening window. That is 11 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 1,252 flights scheduled in it.

Across the week, Tuesday is the strongest day at 83.0% on time and Wednesday the weakest at 78.8%. 4 points is a smaller lever than departure hour, but it is free.

Carrier by carrier

Which airlines ran best at PDX in August

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 87.5% of the time; American Airlines manages 75.9%. Sample sizes sit next to every figure, because a two-point gap across 415 flights means less than a ten-point one.

Carriers at PDX in August 2025
Airline	Flights	On time	Avg delay	Cancelled	Grade
Alaska Airlines	1,743	80.5%	49 min	0.69%	B+
SkyWest Airlines	975	84.0%	52 min	0.21%	B+
Southwest Airlines	832	79.4%	46 min	0.12%	B+
Delta Air Lines	702	87.5%	73 min	0.85%	A+
United Airlines	650	81.3%	64 min	0.92%	B+
American Airlines	415	75.9%	80 min	1.93%	B
Frontier Airlinesthin sample	138	70.4%	57 min	2.17%	C
Hawaiian Airlinesthin sample	84	65.5%	47 min	0.00%	C+
Allegiant Airthin sample	74	68.9%	236 min	0.00%	C+
Spirit Airlinesthin sample	41	85.4%	40 min	0.00%	A+
JetBlue Airwaysthin sample	31	71.0%	66 min	0.00%	C+

Delta leads American by 12 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

Route by route

Busiest routes out of PDX in August

Routes from PDX in August 2025
Route	Flights	On time	Avg delay	Cancelled	Grade
PDX to SEA · Seattle	444	80.5%	48 min	0.45%	B+
PDX to DEN · Denver	436	75.3%	57 min	0.46%	B+
PDX to LAX · Los Angeles	412	83.3%	71 min	1.46%	B
PDX to SFO · San Franciscothin sample	325	81.5%	61 min	0.31%	B+
PDX to ORD · Chicagothin sample	294	76.2%	63 min	0.68%	B+
PDX to LAS · Las Vegasthin sample	274	82.4%	44 min	0.36%	B+
PDX to PHX · Phoenixthin sample	273	77.9%	58 min	0.37%	B+
PDX to DFW · Dallas-Fort Worththin sample	241	72.6%	74 min	2.90%	C
PDX to SLC · Salt Lake Citythin sample	222	85.0%	58 min	0.45%	A+
PDX to SMF · Sacramentothin sample	190	83.1%	45 min	0.53%	B+
PDX to ATL · Atlantathin sample	163	87.0%	46 min	0.61%	A+
PDX to SAN · San Diegothin sample	147	75.9%	52 min	1.36%	B
PDX to SJC · San Josethin sample	143	81.1%	40 min	0.00%	B+
PDX to MSP · Minneapolisthin sample	139	91.4%	105 min	0.00%	A+
PDX to SNA · Santa Anathin sample	133	89.2%	24 min	2.26%	A
PDX to IAH · Houstonthin sample	111	80.0%	49 min	0.90%	B+
PDX to OAK · Oaklandthin sample	104	79.8%	61 min	0.00%	B+
PDX to FAT · Fresnothin sample	94	83.9%	46 min	1.06%	B
PDX to ANC · Anchoragethin sample	94	78.7%	53 min	0.00%	B+
PDX to JFK · New Yorkthin sample	93	82.6%	61 min	1.08%	B
PDX to EWR · Newarkthin sample	93	73.6%	64 min	1.08%	C
PDX to BUR · Burbankthin sample	89	79.3%	42 min	2.25%	B
PDX to BOS · Bostonthin sample	88	77.3%	44 min	0.00%	B+
PDX to MDW · Chicagothin sample	84	91.7%	43 min	0.00%	A+
PDX to HNL · Honoluluthin sample	84	65.5%	47 min	0.00%	C+

Delay causes

What held PDX 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 64,000 reported delay minutes.

Carrier
38%
Late-arriving aircraft
37%
National Airspace System
24%
Extreme weather
1%
Security
0%

37% 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 64,000 reported delay minutes here, that single category outweighs weather by 33 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 64,004 reported delay minutes.

Cancellations are rare at 0.67%, 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.

Badly late arrivals are rare here: only 4.7% land an hour or more behind schedule, against 8.2% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

What to do with this

Flying from PDX in August

For a August trip through PDX: expect 80.9% on time and 0.67% cancelled, going by August 2025. The 5am–8am window was the strongest part of the day.

Portland International (PDX), the whole year
PDX in July75.7%
PDX in September83.7%
PDX in October82.1%
PDX in November84.2%
PDX in December79.3%
PDX in January85.6%
PDX in February86.3%
PDX in March86.3%
PDX in April86.1%
PDX in May83.9%
PDX in June80.3%

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