SEA → PDX: 82% on-time

Historical on-time performance

Seattle to Portland

129 miData through May 2026Source: US DOT · BTS

Flights on SEA–PDX arrive on time 82% of the time over the last 12 months.

On-time rate82%arrived within 15 min

p90 delay25 min1 in 10 flights is worse (tail risk)

Cancelled0.7%of scheduled flights

based on 4,682 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).

By airline

How each carrier compares

Airline	On-time	Median	p90	Cancel	Flights
SkyWest Airlinesbest	85%	on time	20 min	0.5%	3,305
Delta Air Lines	75%	on time	35 min	0.0%	275
Alaska Airlines	73%	on time	40 min	1.5%	1,102

SkyWest Airlinesbest
On-time85%
Medianon time
p9020 min
Cancel0.5%
Flights3,305
Delta Air Lines
On-time75%
Medianon time
p9035 min
Cancel0.0%
Flights275
Alaska Airlines
On-time73%
Medianon time
p9040 min
Cancel1.5%
Flights1,102

Why flights run late

Delay causes

Airline50%
Weather12%
Air traffic (NAS)12%
Late aircraft26%
Security0%

Most delay minutes here are attributed to Airline.

When flights don't go

Why flights were cancelled

Airline21%
Weather33%
Air traffic (NAS)45%
Security0%

Most cancellations here are attributed to Air traffic (NAS). Shares are among 33 cancellations with a reported cause (BTS reports causes from June 2003).

Over time

On-time trend

By season

On-time rate by month

When to fly

Best time to fly SEA → PDX

All airlines · rolling 36 months (2023-06 .. 2026-05).

Best time of day

Mornings are the most reliable time of day to fly this route — 90% on time.

Mornings90% on time · p90 15 min · 3,006 flights
Middays82% on time · p90 25 min · 3,254 flights
Afternoons81% on time · p90 30 min · 2,228 flights
Evenings80% on time · p90 30 min · 3,351 flights
Overnights73% on time · p90 35 min · 3,897 flights

Best day of week

On-time rates are fairly even by day on this route — ranging from 78% to 84% on time.

Tuesdays84% on time · p90 25 min · 2,303 flights
Wednesdays82% on time · p90 25 min · 2,288 flights
Saturdays81% on time · p90 25 min · 1,987 flights
Mondays79% on time · p90 30 min · 2,322 flights
Fridays79% on time · p90 30 min · 2,302 flights
Sundays79% on time · p90 30 min · 2,217 flights
Thursdays78% on time · p90 30 min · 2,317 flights

Keep exploring

Delay predictorfor this route→SEA airportSeattle→PDX airportPortland→SkyWest Airlinesairline profile→Alaska Airlinesairline profile→Delta Air Linesairline profile→Seasonal delay patternsguide→