Route · BOI → SEA · 2020–2025 BTS data
Boise to Seattle
The BOI–SEA corridor (Boise, ID → Seattle, WA) runs ahead of the national average, served by 8 carriers across roughly 399 miles.
Data updated 2026-06-13
- 86.9%
- On-time
- +7.9 pts
- vs US avg
- 62 min
- Delay when late
- 24,617
- Flights
Cancelled
0.3%
Best Month
Mar 2024 91%
Worst Month
Jan 2024 70%
Distance
399 mi
Carriers
8
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 238 | 30 | 0 | 2 | AS,OO |
| Nov 2025 | 252 | 35 | 3 | 0 | OO,AS |
| Oct 2025 | 301 | 45 | 1 | 0 | AS,OO |
| Sep 2025 | 330 | 52 | 2 | 0 | OO,AS |
| Aug 2025 | 349 | 64 | 0 | 0 | OO,AS |
| Jul 2025 | 362 | 57 | 1 | 0 | AS,OO |
| Jun 2025 | 339 | 58 | 1 | 0 | AS,OO |
| May 2025 | 316 | 44 | 0 | 0 | AS,OO |
| Apr 2025 | 344 | 50 | 0 | 0 | OO,AS |
| Mar 2025 | 334 | 43 | 1 | 2 | AS,OO |
| Feb 2025 | 284 | 77 | 3 | 0 | AS,OO |
| Jan 2025 | 310 | 55 | 1 | 2 | AS,OO |
| Dec 2024 | 260 | 47 | 4 | 1 | AS,OO |
| Nov 2024 | 262 | 33 | 0 | 0 | OO,AS |
| Oct 2024 | 304 | 35 | 0 | 0 | AS,OO |
| Sep 2024 | 280 | 56 | 0 | 2 | OO,AS |
| Aug 2024 | 310 | 83 | 0 | 0 | AS,OO |
| Jul 2024 | 312 | 63 | 1 | 0 | AS,DL,OO |
| Jun 2024 | 323 | 69 | 0 | 0 | AS,OO |
| May 2024 | 362 | 61 | 0 | 0 | AS,OO |
| Apr 2024 | 331 | 44 | 0 | 0 | AS,OO |
| Mar 2024 | 351 | 30 | 1 | 0 | AS,OO |
| Feb 2024 | 312 | 31 | 0 | 1 | AS,OO |
| Jan 2024 | 304 | 92 | 2 | 0 | AS,OO |
Cancellation Rate
0.3%
21 of 7,470 flights
Diversion Rate
0.1%
10 of 7,470 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
BOI - Boise
Full on-time, delay-cause, and seasonal performance for Boise, ID.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See BOI 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 BOI–SEA.
Routes with a similar on-time rate
What the Data Says About BOI to SEA
Boise to Seattle (BOI to SEA) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 86.9% on-time rate across 24,617 flights, with delays that do happen averaging 61.9 minutes. The corridor runs roughly 399 miles and is served by 8 carriers. Over the most recent 24 months, 21 of 7,470 flights were cancelled (0.3%) and 10 diverted (0.1%).
The monthly split is wide on this route: Mar 2024 posted the strongest performance at 91% on-time, while Jan 2024 came in at just 70% - a 22-point swing worth factoring into travel timing.
Frequently Asked Questions
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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.