Portland International in May 2026

83.7%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 May 2026, reporting carriers scheduled 5,535 domestic departures from Portland International (PDX). 83.7% left less than 15 minutes late and 83.3% reached their destination on time; 0.4% were cancelled.

Nationally that month, 77.1% of flights departed on time and 77.6% arrived on time, so PDX departures were 6.6 points above the national departure figure.

A year earlier, in May 2025, the airport had 5,201 departures with 86.2% leaving on time: a change of −2.5 points, with flights up 6%.

Flights arriving at PDX that month were on time 82.1% of the time (5,534 scheduled arrivals).

Of the delay minutes that carriers assigned to a BTS cause category that month, air carrier 38%, late-arriving aircraft 35% and national aviation system 25%.

On time 83.3%
Arrived 15+ minutes late 16.0%
Cancelled 0.4%
Diverted 0.2%

Every scheduled departure from PDX in May 2026, judged by arrival at the destination.

May 2026 against a year earlier, the airport's year and the nation

Measure	May 2026	May 2025	PDX, 12 months to Jul 2026	All reported flights, May 2026
Departed on time	83.7%	86.2%	82.7%	77.1%
Arrived on time	83.3%	83.2%	82.0%	77.6%
Cancelled	0.4%	0.3%	0.7%	0.9%
Average departure delay (late minutes only)	11.4 min	9.1 min	11.6 min	16.0 min
Scheduled departures a day	185	173	173	20,391
Scheduled departures	5,535	5,201	63,282	611,735

Airlines that month

Reporting carrier	Flights	Share	On time	Avg arrival delay	Cancelled
AS Alaska Airlines	2,071	37%	85.7%	-3.8 min	0.2%
OO SkyWest Airlines	1,020	18%	87.1%	-1.3 min	0.3%
WN Southwest Airlines	686	12%	75.2%	7.2 min	0.1%
UA United Airlines	617	11%	78.4%	4.1 min	0.3%
DL Delta Air Lines	610	11%	89.0%	1.7 min	0.8%
AA American Airlines	429	8%	76.5%	9.8 min	1.6%
F9 Frontier Airlines	61	1%	91.8%	-13.8 min	1.6%
G4 Allegiant Air	29	1%	48.3%	65.6 min	0.0%
B6 JetBlue Airways	11	0%	90.9%	2.0 min	0.0%
MQ Envoy Air	1	0%	0.0%	34.0 min	0.0%

Busiest routes that month

Route	Cities	Flights	On time	Avg arrival delay	Cancelled
PDX–SEA	Portland to Seattle	391	85.7%	-3.2 min	0.3%
PDX–LAX	Portland to Los Angeles	377	89.4%	-4.1 min	0.3%
PDX–DEN	Portland to Denver	367	83.7%	-1.3 min	0.0%
PDX–PHX	Portland to Phoenix	314	83.4%	4.3 min	0.0%
PDX–SFO	Portland to San Francisco	299	47.5%	29.6 min	0.3%
PDX–ORD	Portland to Chicago	285	84.2%	1.6 min	0.0%
PDX–LAS	Portland to Las Vegas	237	84.4%	-0.8 min	0.4%
PDX–DFW	Portland to Dallas/Fort Worth	203	75.4%	10.4 min	3.4%
PDX–SLC	Portland to Salt Lake City	192	91.1%	-1.4 min	1.0%
PDX–SMF	Portland to Sacramento	166	82.5%	3.8 min	0.0%
PDX–SAN	Portland to San Diego	155	83.9%	-1.0 min	0.0%
PDX–MSP	Portland to Minneapolis	142	95.1%	-8.6 min	0.0%

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), May 2026.

Delay causes

BTS cause category	Share of delay minutes	National, May 2026	Minutes
Air carrier	37.8%	33.0%	20,846
Late-arriving aircraft	35.2%	40.4%	19,448
National Aviation System	25.2%	20.5%	13,901
Extreme weather	1.7%	6.0%	943
Security	0.1%	0.1%	70

55,208 delay minutes on 888 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 May 2026?

83.7% of 5,535 scheduled domestic departures left less than 15 minutes late, and 83.3% reached their destination on time. The national figures that month were 77.1% and 77.6%.

How does that compare with a year earlier?

In May 2025, 86.2% of 5,201 departures left on time and 0.3% were cancelled, against 83.7% and 0.4% in May 2026.

Provenance

Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2026; 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.