Route · SEA → PDX · 2020–2025 BTS data
Seattle to Portland
The SEA–PDX corridor (Seattle, WA → Portland, OR) runs ahead of the national average, served by 19 carriers across roughly 129 miles.
Data updated 2026-06-13
- 83.7%
- On-time
- +4.7 pts
- vs US avg
- 55 min
- Delay when late
- 35,578
- Flights
Cancelled
0.8%
Best Month
Oct 2025 88%
Worst Month
Jun 2024 67%
Distance
129 mi
Carriers
19
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 378 | 99 | 2 | 0 | DL,AS,OO |
| Nov 2025 | 403 | 56 | 15 | 0 | OO,DL,AS |
| Oct 2025 | 428 | 51 | 3 | 0 | AS,OO,DL |
| Sep 2025 | 433 | 69 | 0 | 0 | OO,DL,AS |
| Aug 2025 | 416 | 76 | 0 | 0 | OO,AS,DL |
| Jul 2025 | 392 | 94 | 1 | 0 | AS,OO,DL |
| Jun 2025 | 373 | 104 | 1 | 0 | AS,DL,OO |
| May 2025 | 387 | 71 | 1 | 0 | AS,DL,OO |
| Apr 2025 | 402 | 59 | 0 | 0 | DL,OO,AS |
| Mar 2025 | 410 | 63 | 0 | 0 | AS,OO,DL |
| Feb 2025 | 369 | 102 | 8 | 0 | AS,OO,DL |
| Jan 2025 | 400 | 67 | 3 | 0 | AS,OO,DL |
| Dec 2024 | 373 | 70 | 1 | 0 | AS,DL,OO |
| Nov 2024 | 400 | 58 | 1 | 0 | OO,AS,DL |
| Oct 2024 | 440 | 58 | 1 | 1 | AS,OO,DL |
| Sep 2024 | 473 | 98 | 0 | 0 | OO,AS,DL |
| Aug 2024 | 460 | 117 | 0 | 0 | AS,DL,OO |
| Jul 2024 | 437 | 124 | 2 | 0 | AS,DL,OO |
| Jun 2024 | 422 | 139 | 0 | 0 | AS,DL,OO |
| May 2024 | 464 | 114 | 0 | 0 | AS,DL,OO |
| Apr 2024 | 446 | 80 | 0 | 0 | AS,DL,OO |
| Mar 2024 | 421 | 78 | 0 | 0 | AS,DL,OO |
| Feb 2024 | 445 | 62 | 0 | 0 | AS,DL,OO |
| Jan 2024 | 478 | 123 | 40 | 1 | AS,DL,OO |
Cancellation Rate
0.8%
79 of 10,050 flights
Diversion Rate
0.0%
2 of 10,050 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Origin airport →PDX - Portland
Full on-time, delay-cause, and seasonal performance for Portland, OR.
Destination airport →Compare the two airports
See SEA and PDX side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to SEA–PDX.
Routes with a similar on-time rate
What the Data Says About SEA to PDX
Bureau of Transportation Statistics records show Seattle to Portland (SEA to PDX) running a 83.7% on-time rate over 35,578 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 55.3 minutes. The 129-mile corridor is served by 19 carriers, and over the last 24 months 0.8% of 10,050 flights were cancelled, 0.0% diverted.
The monthly split is wide on this route: Oct 2025 posted the strongest performance at 88% on-time, while Jun 2024 came in at just 67% - a 21-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from SEA to PDX? ▼
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Flight Guides
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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.