Route · SEA → BOI · 2020–2025 BTS data
Seattle to Boise
The SEA–BOI corridor (Seattle, WA → Boise, ID) runs ahead of the national average, served by 8 carriers across roughly 399 miles.
Data updated 2026-06-13
- 86%
- On-time
- +7 pts
- vs US avg
- 59 min
- Delay when late
- 25,171
- Flights
Cancelled
0.2%
Best Month
Oct 2025 92%
Worst Month
Feb 2025 70%
Distance
399 mi
Carriers
8
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 266 | 39 | 0 | 0 | AS,OO |
| Nov 2025 | 282 | 37 | 3 | 1 | OO,AS |
| Oct 2025 | 333 | 28 | 0 | 0 | AS,OO |
| Sep 2025 | 334 | 46 | 0 | 0 | OO,AS |
| Aug 2025 | 370 | 74 | 0 | 0 | OO,AS |
| Jul 2025 | 394 | 79 | 1 | 0 | AS,OO |
| Jun 2025 | 368 | 87 | 1 | 0 | AS,OO |
| May 2025 | 334 | 48 | 0 | 0 | AS,OO |
| Apr 2025 | 344 | 56 | 0 | 0 | OO,AS |
| Mar 2025 | 334 | 57 | 1 | 0 | AS,OO |
| Feb 2025 | 284 | 85 | 2 | 0 | AS,OO |
| Jan 2025 | 311 | 54 | 1 | 0 | AS,OO |
| Dec 2024 | 259 | 49 | 3 | 1 | AS,OO |
| Nov 2024 | 262 | 25 | 0 | 0 | OO,AS |
| Oct 2024 | 306 | 32 | 1 | 0 | AS,OO |
| Sep 2024 | 280 | 67 | 0 | 0 | OO,AS |
| Aug 2024 | 310 | 64 | 0 | 0 | AS,OO |
| Jul 2024 | 312 | 55 | 1 | 0 | AS,DL,OO |
| Jun 2024 | 323 | 78 | 0 | 0 | AS,OO |
| May 2024 | 362 | 73 | 0 | 0 | AS,OO |
| Apr 2024 | 331 | 38 | 0 | 0 | AS,OO |
| Mar 2024 | 352 | 32 | 1 | 0 | AS,OO |
| Feb 2024 | 312 | 33 | 0 | 0 | AS,OO |
| Jan 2024 | 307 | 76 | 2 | 0 | AS,OO |
Cancellation Rate
0.2%
17 of 7,670 flights
Diversion Rate
0.0%
2 of 7,670 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 →BOI - Boise
Full on-time, delay-cause, and seasonal performance for Boise, ID.
Destination airport →Compare the two airports
See SEA and BOI 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–BOI.
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What the Data Says About SEA to BOI
Seattle to Boise (SEA to BOI) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 86% on-time rate across 25,171 flights, with delays that do happen averaging 58.6 minutes. The corridor runs roughly 399 miles and is served by 8 carriers. Over the most recent 24 months, 17 of 7,670 flights were cancelled (0.2%) and 2 diverted (0.0%).
The monthly split is wide on this route: Oct 2025 posted the strongest performance at 92% on-time, while Feb 2025 came in at just 70% - a 22-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from SEA to BOI? ▼
What is the cancellation rate for SEA to BOI? ▼
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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.