Route · IAD → SLC · 2020–2025 BTS data
Washington to Salt Lake City
The IAD–SLC corridor (Washington, DC → Salt Lake City, UT) runs ahead of the national average, served by 3 carriers across roughly 1,828 miles.
Data updated 2026-06-13
- 86.9%
- On-time
- +7.9 pts
- vs US avg
- 83 min
- Delay when late
- 1,891
- Flights
Cancelled
0.5%
Best Month
Aug 2025 94%
Worst Month
Jun 2025 64%
Distance
1,828 mi
Carriers
3
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 46 | 12 | 1 | 1 | DL,UA |
| Nov 2025 | 59 | 15 | 0 | 0 | UA,DL |
| Oct 2025 | 62 | 7 | 0 | 0 | DL,UA |
| Sep 2025 | 60 | 8 | 0 | 0 | UA,DL |
| Aug 2025 | 63 | 4 | 0 | 0 | UA,DL |
| Jul 2025 | 62 | 8 | 0 | 0 | DL,UA |
| Jun 2025 | 61 | 22 | 0 | 0 | DL,UA |
| May 2025 | 62 | 7 | 1 | 1 | DL,UA |
| Apr 2025 | 60 | 10 | 0 | 0 | UA,DL |
| Mar 2025 | 62 | 7 | 0 | 0 | DL,UA |
| Feb 2025 | 56 | 13 | 0 | 0 | DL,UA |
| Jan 2025 | 62 | 15 | 1 | 1 | DL,UA |
| Dec 2024 | 44 | 6 | 0 | 1 | DL,UA |
| Nov 2024 | 30 | 4 | 0 | 0 | DL |
| Oct 2024 | 31 | 2 | 0 | 0 | DL |
| Sep 2024 | 30 | 0 | 0 | 0 | DL |
| Aug 2024 | 31 | 5 | 0 | 0 | DL |
| Jul 2024 | 31 | 6 | 2 | 0 | DL |
| Jun 2024 | 30 | 0 | 0 | 0 | DL |
| May 2024 | 31 | 1 | 0 | 0 | DL |
| Apr 2024 | 30 | 3 | 0 | 0 | DL |
| Mar 2024 | 31 | 1 | 0 | 0 | DL |
| Jan 2024 | 31 | 4 | 0 | 0 | DL |
| Dec 2023 | 31 | 3 | 0 | 0 | DL |
Cancellation Rate
0.5%
5 of 1,096 flights
Diversion Rate
0.4%
4 of 1,096 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
IAD - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
Origin airport →SLC - Salt Lake City
Full on-time, delay-cause, and seasonal performance for Salt Lake City, UT.
Destination airport →Compare the two airports
See IAD and SLC side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAD–SLC.
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What the Data Says About IAD to SLC
Washington to Salt Lake City (IAD to SLC) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 86.9% on-time rate across 1,891 flights, with delays that do happen averaging 83.2 minutes. The corridor runs roughly 1,828 miles and is served by 3 carriers. Over the most recent 24 months, 5 of 1,096 flights were cancelled (0.5%) and 4 diverted (0.4%).
The monthly split is wide on this route: Aug 2025 posted the strongest performance at 94% on-time, while Jun 2025 came in at just 64% - a 30-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.