Delta Air Lines IAD to SLC on-time performance
Delta Air Lines nonstop flights from Washington to Salt Lake City · Aug 2025 – Jul 2026
On-time arrivals
85%
arrived < 15 min late
Cancelled
1.6%
6 flights
Avg arrival delay
17 min
103 min when late
Rank on route
#1 of 2
route average 83% on time
Key facts
- Delta Air Lines flights on IAD to SLC arrived on time 85% of the time in Aug 2025 – Jul 2026.
- 1.6% were cancelled, and 6% arrived an hour or more late.
- That ranks #1 of 2 airlines on this route, which averaged 83% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (83%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)83%
- Air traffic control & airport congestion15%
- Extreme weather2%
- Late-arriving aircraft0%
- Security0%
Other airlines on IAD to SLC
- United Airlines81% on time · 21 min avg delay
Full IAD to SLC comparison →
Delta Air Lines on-time record across all routes →
364 Delta Air Lines flights tracked on this route; 6 cancelled, 0 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.