Historical on-time performance
Washington to Salt Lake City
1,827 miData through Dec 2025Source: US DOT · BTS
Flights on IAD–SLC arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights
based on 615 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time86%Medianon timep9020 minCancel0.3%Flights308
- United AirlinesOn-time79%Medianon timep9035 minCancel0.7%Flights307
Why flights run late
Delay causes
- Airline59%
- Weather5%
- Air traffic (NAS)19%
- Late aircraft16%
- Security0%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly IAD → SLC
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 87% on time.
- Mornings87% on time · p90 15 min · 1,149 flights
- Evenings75% on time · p90 40 min · 310 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 82% to 87% on time.
- Tuesdays87% on time · p90 20 min · 208 flights
- Wednesdays86% on time · p90 20 min · 208 flights
- Mondays86% on time · p90 15 min · 210 flights
- Thursdays85% on time · p90 20 min · 207 flights
- Saturdays84% on time · p90 20 min · 209 flights
- Fridays84% on time · p90 30 min · 208 flights
- Sundays82% on time · p90 25 min · 209 flights
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