Historical on-time performance
Boston to Salt Lake City
Flights on BOS–SLC arrive on time 75% of the time over the last 12 months.
based on 1,181 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Not enough comparable data to name a most-on-time carrier — low-data carriers aren't ranked.
- Delta Air LinesOn-time77%Medianon timep9035 minCancel1.2%Flights1,083
- JetBlue AirwaysOn-time52%Median10 minp9075 minCancel5.1%Flights98
Why flights run late
Delay causes
- Airline44%
- Weather1%
- Air traffic (NAS)29%
- Late aircraft26%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline28%
- Weather67%
- Air traffic (NAS)6%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 18 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 BOS → SLC
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 87% on time.
- Mornings87% on time · p90 15 min · 1,315 flights
- Middays80% on time · p90 30 min · 764 flights
- Evenings72% on time · p90 60 min · 1,470 flights
- Afternoons68% on time · p90 85 min · 294 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 74% to 83% on time.
- Wednesdays83% on time · p90 25 min · 511 flights
- Tuesdays80% on time · p90 35 min · 514 flights
- Mondays80% on time · p90 40 min · 557 flights
- Saturdays78% on time · p90 40 min · 598 flights
- Thursdays77% on time · p90 40 min · 559 flights
- Fridays77% on time · p90 40 min · 566 flights
- Sundays74% on time · p90 50 min · 572 flights
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