Route · SLC → SEA · 2020–2025 BTS data
Salt Lake City to Seattle
The SLC–SEA corridor (Salt Lake City, UT → Seattle, WA) runs ahead of the national average, served by 21 carriers across roughly 689 miles.
Data updated 2026-06-13
- 84%
- On-time
- +5 pts
- vs US avg
- 59 min
- Delay when late
- 22,741
- Flights
Cancelled
0.8%
Best Month
Oct 2024 91%
Worst Month
Jun 2025 67%
Distance
689 mi
Carriers
21
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 303 | 88 | 1 | 2 | DL,F9,AS,OO |
| Nov 2025 | 299 | 48 | 9 | 1 | OO,DL,F9,AS |
| Oct 2025 | 367 | 74 | 5 | 0 | AS,OO,DL,F9 |
| Sep 2025 | 398 | 71 | 1 | 1 | OO,DL,F9,AS |
| Aug 2025 | 409 | 113 | 5 | 0 | OO,F9,AS,DL |
| Jul 2025 | 394 | 101 | 4 | 0 | AS,OO,DL,F9 |
| Jun 2025 | 373 | 123 | 2 | 0 | AS,OO,DL,F9 |
| May 2025 | 360 | 93 | 1 | 1 | AS,OO,DL,F9 |
| Apr 2025 | 307 | 53 | 1 | 0 | DL,F9,OO,AS |
| Mar 2025 | 306 | 52 | 1 | 2 | AS,OO,DL,F9 |
| Feb 2025 | 281 | 46 | 3 | 0 | AS,OO,DL,F9 |
| Jan 2025 | 319 | 54 | 0 | 2 | AS,OO,DL,F9 |
| Dec 2024 | 304 | 37 | 0 | 0 | AS,DL,F9,OO |
| Nov 2024 | 317 | 32 | 2 | 1 | OO,AS,DL,F9 |
| Oct 2024 | 335 | 29 | 1 | 1 | AS,OO,DL,F9 |
| Sep 2024 | 367 | 56 | 0 | 0 | OO,AS,DL |
| Aug 2024 | 383 | 108 | 2 | 1 | AS,DL,OO |
| Jul 2024 | 397 | 113 | 10 | 0 | AS,DL,OO |
| Jun 2024 | 382 | 102 | 0 | 0 | AS,DL,OO |
| May 2024 | 364 | 69 | 0 | 0 | AS,DL,OO |
| Apr 2024 | 306 | 40 | 0 | 0 | AS,DL,OO |
| Mar 2024 | 275 | 38 | 1 | 0 | AS,DL,OO |
| Feb 2024 | 269 | 30 | 0 | 1 | AS,DL,OO |
| Jan 2024 | 286 | 73 | 14 | 1 | AS,DL,OO |
Cancellation Rate
0.8%
63 of 8,101 flights
Diversion Rate
0.2%
14 of 8,101 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SLC - Salt Lake City
Full on-time, delay-cause, and seasonal performance for Salt Lake City, UT.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See SLC 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 SLC–SEA.
Routes with a similar on-time rate
What the Data Says About SLC to SEA
Bureau of Transportation Statistics records show Salt Lake City to Seattle (SLC to SEA) running a 84% on-time rate over 22,741 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 59.0 minutes. The 689-mile corridor is served by 21 carriers, and over the last 24 months 0.8% of 8,101 flights were cancelled, 0.2% diverted.
The monthly split is wide on this route: Oct 2024 posted the strongest performance at 91% on-time, while Jun 2025 came in at just 67% - a 24-point swing worth factoring into travel timing.
Frequently Asked Questions
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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.