Route · IAD → SLC · 2020–2025 BTS data
Washington to Salt Lake City
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), IAD to SLC (Washington to Salt Lake City) ranks #3886 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 86.9%
- On-time
- +7.9 pts
- vs US avg
- 83 min
- Delay when late
- 1,891
- Flights
- #3886 of 4927
- Corpus placement
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 |
IAD–SLC seasonal on-time pattern
Best: September (93.3%) · weakest: February (76.8%)
Strongest calendar month
September
93.3% on-time · ~36 flights/mo
Busiest calendar month
February
~56 flights/mo avg
Weakest calendar month
February
76.8% on-time · ~56 flights/mo
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.
IAD on-time profileSLC - Salt Lake City
Full on-time, delay-cause, and seasonal performance for Salt Lake City, UT.
SLC on-time profileCompare the two airports
See IAD and SLC side by side on delays, cancellations, and reliability.
Compare IAD vs SLCOrigin-hub reliability standing
Among IAD's stronger departures
IAD → SLC posts a 86.9% on-time rate, landing in the ≥85% band with 14 of 58 BTS-tracked routes leaving Washington. The same hub also shows 42 mid-band and 2 challenged departures · fleet-wide on-time rank #649 of 4927 (highest on-time = #1).
Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAD–SLC.
Routes with a similar on-time rate
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.
On the multi-year calendar, IAD–SLC peaks in September at 93.3% on-time while February carries the heaviest traffic (~56 flights per month) ; the softest month is February at 76.8%, a 16.5-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does IAD to SLC rank among US routes by traffic? ▼
How often are flights delayed from IAD to SLC? ▼
What is the cancellation rate for IAD to SLC? ▼
How far is the flight from IAD to SLC? ▼
When is the best time to fly from IAD to SLC? ▼
Airports on this route
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.
Using IAD–SLC data
IAD–SLC runs 7.9 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare IAD and SLC airport profiles: delay causes and top routes differ even on the same corridor. IAD airport
- If your dates flex, September (93.3% on-time) beats February (76.8%) on this corridor. Seasonal chart
- 4 other routes post a similar 86.9% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
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.