Route
IAD → SLC
Washington Dulles International Airport Salt Lake City International Airport
1,827 miles
Return route SLC → IAD →
How punctual is this route?
- On-time arrivals
- 81.4%
- Less than 15 minutes late
- Cancelled
- 1.4%
- Of scheduled flights
- Average delay when late
- 109 min
- Flights arriving 15+ minutes late
- Flights tracked
- 701
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 48%
- Late-arriving aircraft 29%
- Air traffic control & airport 15%
- Extreme weather 9%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 86.7% | 60 |
| October 2025 | 88.7% | 62 |
| November 2025 | 74.6% | 59 |
| December 2025 | 72.7% | 46 |
| January 2026 | 79.7% | 62 |
| February 2026 | 72.2% | 56 |
| March 2026 | 83.6% | 62 |
| April 2026 | 90.0% | 60 |
| May 2026 | 91.9% | 62 |
| June 2026 | 81.4% | 60 |
| July 2026 | 73.3% | 62 |
| August 2026 | 78.0% | 50 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Delta Air Lines | 364 | 85.2% | 1.6% | 107 min |
| United Airlines | 337 | 77.4% | 1.2% | 110 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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