Historical on-time performance
Boston to Salt Lake City
2,105 miData through Dec 2025Source: US DOT · BTS
Flights on BOS–SLC arrive on time 80% of the time over the last 12 months.
On-time rate80%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 1,154 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time81%Medianon timep9035 minCancel0.3%Flights1,065
- JetBlue AirwaysOn-time67%Medianon timep9045 minCancel2.2%Flights89
Why flights run late
Delay causes
- Airline40%
- Weather1%
- Air traffic (NAS)27%
- Late aircraft32%
- 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 BOS → 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 — 88% on time.
- Mornings88% on time · p90 15 min · 1,289 flights
- Middays82% on time · p90 30 min · 730 flights
- Evenings71% on time · p90 60 min · 1,532 flights
- Afternoons67% on time · p90 85 min · 280 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 81% on time.
- Wednesdays81% on time · p90 30 min · 524 flights
- Mondays80% on time · p90 40 min · 556 flights
- Saturdays80% on time · p90 40 min · 578 flights
- Tuesdays80% on time · p90 45 min · 527 flights
- Thursdays78% on time · p90 40 min · 553 flights
- Fridays76% on time · p90 45 min · 559 flights
- Sundays75% on time · p90 45 min · 568 flights
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