Route · PDX → SEA · 2020–2025 BTS data
Portland to Seattle
The PDX–SEA corridor (Portland, OR → Seattle, WA) runs ahead of the national average, served by 19 carriers across roughly 129 miles.
Data updated 2026-06-13
- 87.7%
- On-time
- +8.7 pts
- vs US avg
- 65 min
- Delay when late
- 36,148
- Flights
Cancelled
1.0%
Best Month
Nov 2024 93%
Worst Month
Jun 2025 75%
Distance
129 mi
Carriers
19
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 412 | 81 | 2 | 0 | DL,AS,OO |
| Nov 2025 | 441 | 46 | 15 | 0 | OO,DL,AS |
| Oct 2025 | 458 | 54 | 2 | 0 | AS,OO,DL |
| Sep 2025 | 463 | 76 | 0 | 0 | OO,DL,AS |
| Aug 2025 | 444 | 86 | 2 | 0 | OO,AS,DL |
| Jul 2025 | 423 | 102 | 0 | 0 | AS,DL,OO |
| Jun 2025 | 403 | 99 | 1 | 0 | AS,OO,DL |
| May 2025 | 405 | 66 | 1 | 0 | AS,OO,DL |
| Apr 2025 | 401 | 52 | 1 | 0 | DL,OO,AS |
| Mar 2025 | 410 | 62 | 0 | 1 | AS,DL,OO |
| Feb 2025 | 369 | 68 | 5 | 0 | AS,OO,DL |
| Jan 2025 | 401 | 49 | 4 | 0 | AS,OO,DL |
| Dec 2024 | 375 | 61 | 1 | 1 | AS,DL,OO |
| Nov 2024 | 405 | 27 | 1 | 0 | OO,AS,DL |
| Oct 2024 | 439 | 40 | 3 | 2 | AS,OO,DL |
| Sep 2024 | 472 | 62 | 0 | 0 | OO,AS,DL |
| Aug 2024 | 459 | 70 | 2 | 2 | AS,DL,OO |
| Jul 2024 | 438 | 65 | 4 | 0 | AS,DL,OO |
| Jun 2024 | 423 | 86 | 0 | 0 | AS,DL,OO |
| May 2024 | 467 | 66 | 1 | 0 | AS,DL,OO |
| Apr 2024 | 452 | 50 | 1 | 0 | AS,DL,OO |
| Mar 2024 | 430 | 38 | 2 | 0 | AS,DL,OO |
| Feb 2024 | 443 | 34 | 2 | 0 | AS,DL,OO |
| Jan 2024 | 477 | 113 | 48 | 0 | AS,DL,OO |
Cancellation Rate
1.0%
98 of 10,310 flights
Diversion Rate
0.1%
6 of 10,310 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
PDX - Portland
Full on-time, delay-cause, and seasonal performance for Portland, OR.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See PDX and SEA side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to PDX–SEA.
Routes with a similar on-time rate
What the Data Says About PDX to SEA
Portland to Seattle (PDX to SEA) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 87.7% on-time rate across 36,148 flights, with delays that do happen averaging 65.3 minutes. The corridor runs roughly 129 miles and is served by 19 carriers. Over the most recent 24 months, 98 of 10,310 flights were cancelled (1.0%) and 6 diverted (0.1%).
The monthly split is wide on this route: Nov 2024 posted the strongest performance at 93% on-time, while Jun 2025 came in at just 75% - a 18-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from PDX to SEA? ▼
What is the cancellation rate for PDX to SEA? ▼
How far is the flight from PDX to SEA? ▼
When is the best time to fly from PDX to SEA? ▼
Flight Guides
Tips and data-driven advice for choosing reliable routes.
Explore PlainFlights
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.