Historical on-time performance
Salt Lake City to Washington
1,827 miData through Dec 2025Source: US DOT · BTS
Flights on SLC–IAD arrive on time 85% of the time over the last 12 months.
On-time rate85%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 584 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesOn-time81%Medianon timep9040 minCancel0.3%Flights308
- United AirlinesbestOn-time89%Medianon timep9015 minCancel1.1%Flights276
Why flights run late
Delay causes
- Airline55%
- Weather3%
- Air traffic (NAS)21%
- Late aircraft22%
- 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 SLC → IAD
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 82% to 88% on time.
- Overnights88% on time · p90 15 min · 146 flights · limited
- Mornings88% on time · p90 15 min · 89 flights · limited
- Middays86% on time · p90 25 min · 133 flights · limited
- Evenings82% on time · p90 35 min · 1,080 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 80% to 87% on time.
- Saturdays87% on time · p90 20 min · 209 flights
- Tuesdays87% on time · p90 40 min · 208 flights
- Mondays85% on time · p90 30 min · 209 flights
- Wednesdays84% on time · p90 30 min · 207 flights
- Fridays83% on time · p90 30 min · 208 flights
- Sundays80% on time · p90 35 min · 209 flights
- Thursdays80% on time · p90 35 min · 207 flights
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