Route Reliability
Washington → Salt Lake City
IAD–SLC · 1,827 miles · Washington Dulles International Airport to Salt Lake City International Airport
- 83%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 1.0%
- Cancelled
- 715
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.Delta Air Lines83%365 flights
- 2.United Airlines83%350 flights
What the data says
Departure time hasn't mattered much.
On-time rates stay between 81% and 84% across the day.
Friday is doing you no favors.
IAD–SLC flights arrived on time 87% of the time on Mondays. On Fridays: 79%.
Not much between Delta Air Lines and United Airlines.
On this route they all land within 83% to 83% on time. Pick on schedule and price.
Trending in the right direction.
IAD–SLC flights arrived on time 89% of the time over the last three months in the data, compared with 76% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon87%(100 flights)
- Tue86%(100 flights)
- Wed84%(101 flights)
- Thu82%(100 flights)
- Fri79%(102 flights)
- Sat83%(103 flights)
- Sun80%(101 flights)
- 6–9 AM84%(412 flights)
- 3–6 PM81%(295 flights)
Jun 67% → May 92% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 67% | 61 |
| July 2025 | 87% | 62 |
| August 2025 | 94% | 63 |
| September 2025 | 87% | 60 |
| October 2025 | 90% | 62 |
| November 2025 | 75% | 59 |
| December 2025 | 73% | 44 |
| January 2026 | 80% | 59 |
| February 2026 | 74% | 54 |
| March 2026 | 84% | 61 |
| April 2026 | 90% | 60 |
| May 2026 | 92% | 62 |
Same trip, other airports
Keep nerding
Based on 715 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.