Portland International in December 2025

78.2%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 December 2025, reporting carriers scheduled 5,124 domestic departures from Portland International (PDX). 78.2% left less than 15 minutes late and 78.6% reached their destination on time; 0.6% were cancelled.

Nationally that month, 72.0% of flights departed on time and 71.9% arrived on time, so PDX departures were 6.2 points above the national departure figure.

A year earlier, in December 2024, the airport had 5,065 departures with 82.2% leaving on time: a change of −4.0 points, with flights up 1%.

Flights arriving at PDX that month were on time 73.9% of the time (5,118 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 37%, air carrier 37% and national aviation system 21%.

On time 78.6%
Arrived 15+ minutes late 20.6%
Cancelled 0.6%
Diverted 0.3%

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

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

Measure	Dec 2025	Dec 2024	PDX, 12 months to Jul 2026	All reported flights, Dec 2025
Departed on time	78.2%	82.2%	82.7%	72.0%
Arrived on time	78.6%	82.0%	82.0%	71.9%
Cancelled	0.6%	0.3%	0.7%	1.5%
Average departure delay (late minutes only)	13.9 min	12.3 min	11.6 min	21.2 min
Scheduled departures a day	171	169	173	19,410
Scheduled departures	5,124	5,065	63,282	582,304

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AS Alaska Airlines	2,075	40%	76.6%	4.3 min	0.6%
OO SkyWest Airlines	823	16%	78.6%	7.3 min	0.7%
WN Southwest Airlines	671	13%	73.9%	8.5 min	0.1%
DL Delta Air Lines	576	11%	84.9%	-6.9 min	1.0%
UA United Airlines	475	9%	83.6%	-0.2 min	0.0%
AA American Airlines	342	7%	85.7%	1.8 min	0.9%
HA Hawaiian Airlines	75	1%	64.0%	48.1 min	2.7%
F9 Frontier Airlines	59	1%	71.2%	29.8 min	0.0%
G4 Allegiant Air	16	0%	87.5%	-2.7 min	0.0%
MQ Envoy Air	12	0%	91.7%	-8.2 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
PDX–SEA	Portland to Seattle	412	79.9%	4.6 min	0.5%
PDX–LAX	Portland to Los Angeles	380	80.0%	1.0 min	0.3%
PDX–DEN	Portland to Denver	346	76.0%	5.7 min	0.3%
PDX–PHX	Portland to Phoenix	344	79.1%	8.4 min	0.9%
PDX–LAS	Portland to Las Vegas	239	73.2%	13.5 min	0.0%
PDX–SFO	Portland to San Francisco	238	73.1%	9.8 min	0.4%
PDX–DFW	Portland to Dallas/Fort Worth	212	86.3%	0.1 min	0.0%
PDX–SLC	Portland to Salt Lake City	201	85.6%	-2.6 min	1.0%
PDX–SJC	Portland to San Jose	184	81.0%	2.9 min	0.0%
PDX–ORD	Portland to Chicago	164	77.4%	2.4 min	0.6%
PDX–SAN	Portland to San Diego	157	66.9%	12.1 min	1.3%
PDX–SNA	Portland to Santa Ana	149	80.5%	-1.8 min	2.7%

By scheduled departure hour

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

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

Delay causes

BTS cause category	Share of delay minutes	National, Dec 2025	Minutes
Air carrier	36.9%	33.3%	22,765
Late-arriving aircraft	37.2%	41.1%	22,943
National Aviation System	20.9%	19.1%	12,867
Extreme weather	4.9%	6.4%	3,035
Security	0.2%	0.2%	95

61,705 delay minutes on 1,054 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 December 2025?

78.2% of 5,124 scheduled domestic departures left less than 15 minutes late, and 78.6% reached their destination on time. The national figures that month were 72.0% and 71.9%.

How does that compare with a year earlier?

In December 2024, 82.2% of 5,065 departures left on time and 0.3% were cancelled, against 78.2% and 0.6% in December 2025.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for December 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.