Historical on-time performance
Salt Lake City to Philadelphia
1,926 miData through Dec 2025Source: US DOT · BTS
Flights on SLC–PHL arrive on time 80% of the time over the last 12 months.
On-time rate80%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled1.4%of scheduled flights
based on 653 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Delta Air LinesOn-time80%Medianon timep9020 minCancel0.3%Flights592
- American AirlinesOn-time82%Medianon timep9010 minCancel11.5%Flights61
Why flights run late
Delay causes
- Airline35%
- Weather2%
- Air traffic (NAS)35%
- Late aircraft27%
- 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 SLC → PHL
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 76% to 90% on time.
- Evenings90% on time · p90 10 min · 81 flights · limited
- Mornings87% on time · p90 10 min · 101 flights · limited
- Middays79% on time · p90 25 min · 902 flights
- Overnights76% on time · p90 30 min · 811 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 74% to 83% on time.
- Tuesdays83% on time · p90 20 min · 225 flights
- Mondays82% on time · p90 20 min · 305 flights
- Fridays80% on time · p90 25 min · 307 flights
- Wednesdays80% on time · p90 30 min · 239 flights
- Saturdays79% on time · p90 25 min · 239 flights
- Thursdays76% on time · p90 30 min · 306 flights
- Sundays74% on time · p90 30 min · 305 flights
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