Route · SLC → IAD · 2020–2025 BTS data
Salt Lake City to Washington
The SLC–IAD corridor (Salt Lake City, UT → Washington, DC) runs ahead of the national average, served by 3 carriers across roughly 1,828 miles.
Data updated 2026-06-13
- 84.9%
- On-time
- +5.9 pts
- vs US avg
- 82 min
- Delay when late
- 1,920
- Flights
Cancelled
0.6%
Best Month
Aug 2025 95%
Worst Month
Jul 2025 73%
Distance
1,828 mi
Carriers
3
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 46 | 6 | 1 | 0 | DL,UA |
| Nov 2025 | 59 | 5 | 0 | 0 | UA,DL |
| Oct 2025 | 62 | 7 | 0 | 0 | UA,DL |
| Sep 2025 | 60 | 6 | 0 | 0 | UA,DL |
| Aug 2025 | 62 | 3 | 0 | 0 | UA,DL |
| Jul 2025 | 62 | 17 | 0 | 0 | UA,DL |
| Jun 2025 | 61 | 15 | 0 | 0 | UA,DL |
| May 2025 | 62 | 12 | 2 | 0 | UA,DL |
| Apr 2025 | 59 | 7 | 1 | 0 | DL,UA |
| Mar 2025 | 62 | 10 | 0 | 0 | UA,DL |
| Feb 2025 | 56 | 12 | 0 | 0 | UA,DL |
| Jan 2025 | 62 | 6 | 1 | 0 | UA,DL |
| Dec 2024 | 44 | 10 | 0 | 0 | DL,UA |
| Nov 2024 | 30 | 1 | 0 | 0 | DL |
| Oct 2024 | 31 | 4 | 0 | 0 | DL |
| Sep 2024 | 30 | 0 | 0 | 1 | DL |
| Aug 2024 | 31 | 8 | 0 | 0 | DL |
| Jul 2024 | 31 | 8 | 2 | 0 | DL |
| Jun 2024 | 30 | 6 | 0 | 0 | DL |
| May 2024 | 31 | 7 | 0 | 0 | DL |
| Apr 2024 | 30 | 5 | 0 | 0 | DL |
| Mar 2024 | 31 | 7 | 0 | 0 | DL |
| Jan 2024 | 31 | 4 | 0 | 0 | DL |
| Dec 2023 | 31 | 5 | 0 | 0 | DL |
Cancellation Rate
0.6%
7 of 1,094 flights
Diversion Rate
0.1%
1 of 1,094 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 →IAD - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
Destination airport →Compare the two airports
See SLC and IAD 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–IAD.
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What the Data Says About SLC to IAD
Bureau of Transportation Statistics records show Salt Lake City to Washington (SLC to IAD) running a 84.9% on-time rate over 1,920 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 81.7 minutes. The 1,828-mile corridor is served by 3 carriers, and over the last 24 months 0.6% of 1,094 flights were cancelled, 0.1% diverted.
The monthly split is wide on this route: Aug 2025 posted the strongest performance at 95% on-time, while Jul 2025 came in at just 73% - a 23-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.