Historical on-time performance
Salt Lake City to Washington
Flights on SLC–IAD arrive on time 85% of the time over the last 12 months.
based on 614 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time89%Medianon timep9015 minCancel0.7%Flights306
- Delta Air LinesOn-time81%Medianon timep9035 minCancel1.3%Flights308
Why flights run late
Delay causes
- Airline56%
- Weather5%
- Air traffic (NAS)21%
- Late aircraft19%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline33%
- Weather67%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 6 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SLC → IAD
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 83% to 89% on time.
- Mornings89% on time · p90 10 min · 113 flights · limited
- Overnights88% on time · p90 15 min · 186 flights · limited
- Middays85% on time · p90 25 min · 220 flights
- Evenings83% on time · p90 35 min · 1,089 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 81% to 87% on time.
- Tuesdays87% on time · p90 25 min · 228 flights
- Saturdays87% on time · p90 20 min · 232 flights
- Mondays85% on time · p90 30 min · 229 flights
- Wednesdays84% on time · p90 25 min · 227 flights
- Fridays84% on time · p90 50 min · 231 flights
- Thursdays82% on time · p90 25 min · 230 flights
- Sundays81% on time · p90 25 min · 231 flights
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