Historical on-time performance
Philadelphia to Salt Lake City
1,926 miData through Dec 2025Source: US DOT · BTS
Flights on PHL–SLC arrive on time 72% of the time over the last 12 months.
On-time rate72%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled1.8%of scheduled flights
based on 654 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time75%Medianon timep9035 minCancel0.8%Flights592
- American AirlinesOn-time47%Median10 minp9065 minCancel11.3%Flights62
Why flights run late
Delay causes
- Airline35%
- Weather1%
- Air traffic (NAS)40%
- Late aircraft25%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly PHL → 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 — 84% on time.
- Mornings84% on time · p90 25 min · 1,069 flights
- Evenings66% on time · p90 70 min · 789 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 78% on time.
- Thursdays78% on time · p90 45 min · 307 flights
- Fridays78% on time · p90 30 min · 308 flights
- Wednesdays77% on time · p90 35 min · 232 flights
- Mondays76% on time · p90 50 min · 310 flights
- Tuesdays76% on time · p90 50 min · 225 flights
- Sundays75% on time · p90 40 min · 297 flights
- Saturdays70% on time · p90 60 min · 247 flights
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