Portland International in September 2025

87.0%departed on time

BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.

In September 2025, reporting carriers scheduled 5,269 domestic departures from Portland International (PDX). 87.0% left less than 15 minutes late and 83.4% reached their destination on time; 0.2% were cancelled.

Nationally that month, 83.1% of flights departed on time and 82.8% arrived on time, so PDX departures were 3.9 points above the national departure figure.

A year earlier, in September 2024, the airport had 5,244 departures with 87.5% leaving on time: a change of −0.5 points, with flights up 0%.

Flights arriving at PDX that month were on time 86.0% of the time (5,275 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 39%, national aviation system 31% and late-arriving aircraft 28%.

On time 83.4%
Arrived 15+ minutes late 16.2%
Cancelled 0.2%
Diverted 0.2%

Every scheduled departure from PDX in September 2025, judged by arrival at the destination.

September 2025 against a year earlier, the airport's year and the nation

Measure	Sep 2025	Sep 2024	PDX, 12 months to Jul 2026	All reported flights, Sep 2025
Departed on time	87.0%	87.5%	82.7%	83.1%
Arrived on time	83.4%	86.0%	82.0%	82.8%
Cancelled	0.2%	0.2%	0.7%	0.5%
Average departure delay (late minutes only)	8.2 min	8.5 min	11.6 min	12.2 min
Scheduled departures a day	176	175	173	18,748
Scheduled departures	5,269	5,244	63,282	562,439

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AS Alaska Airlines	1,702	32%	84.8%	-0.6 min	0.1%
OO SkyWest Airlines	924	18%	85.0%	-1.2 min	0.0%
WN Southwest Airlines	802	15%	77.6%	7.4 min	0.2%
DL Delta Air Lines	648	12%	92.9%	-6.3 min	0.0%
UA United Airlines	615	12%	82.0%	4.3 min	0.3%
AA American Airlines	339	6%	80.5%	16.4 min	1.2%
F9 Frontier Airlines	103	2%	68.9%	15.1 min	0.0%
HA Hawaiian Airlines	71	1%	53.5%	25.0 min	0.0%
G4 Allegiant Air	37	1%	89.2%	-4.7 min	0.0%
NK Spirit Airlines	26	0%	80.8%	1.8 min	0.0%
B6 JetBlue Airways	2	0%	50.0%	34.5 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
PDX–SEA	Portland to Seattle	463	83.6%	-1.8 min	0.0%
PDX–DEN	Portland to Denver	395	77.5%	8.6 min	0.3%
PDX–LAX	Portland to Los Angeles	372	92.2%	-8.4 min	0.0%
PDX–SFO	Portland to San Francisco	329	80.2%	2.4 min	0.0%
PDX–LAS	Portland to Las Vegas	265	78.9%	5.6 min	0.0%
PDX–ORD	Portland to Chicago	255	74.9%	14.7 min	0.0%
PDX–PHX	Portland to Phoenix	254	78.3%	9.2 min	1.2%
PDX–DFW	Portland to Dallas/Fort Worth	198	80.8%	9.6 min	1.0%
PDX–SLC	Portland to Salt Lake City	176	92.0%	-2.1 min	0.0%
PDX–SMF	Portland to Sacramento	164	84.8%	3.4 min	0.0%
PDX–SJC	Portland to San Jose	150	78.7%	6.5 min	0.7%
PDX–SNA	Portland to Santa Ana	147	95.2%	-8.3 min	0.0%

By scheduled departure hour

100

On-time share:under 62%6270768288% and over

Share of departures that left less than 15 minutes late, by scheduled hour (local time), September 2025.

Delay causes

BTS cause category	Share of delay minutes	National, Sep 2025	Minutes
Air carrier	38.6%	34.3%	16,847
Late-arriving aircraft	28.4%	37.4%	12,414
National Aviation System	30.7%	22.6%	13,416
Extreme weather	1.7%	5.6%	761
Security	0.5%	0.1%	201

43,639 delay minutes on 854 flights that arrived 15 or more minutes late and carried a cause report. Carriers assign the categories; see what each category means.

Questions and answers

How many flights left PDX on time in September 2025?

87.0% of 5,269 scheduled domestic departures left less than 15 minutes late, and 83.4% reached their destination on time. The national figures that month were 83.1% and 82.8%.

How does that compare with a year earlier?

In September 2024, 87.5% of 5,244 departures left on time and 0.2% were cancelled, against 87.0% and 0.2% in September 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for September 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for PDX · methodology · corrections.