Historical on-time performance
Salt Lake City to Seattle
Flights on SLC–SEA arrive on time 79% of the time over the last 12 months.
based on 3,996 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time83%Medianon timep9025 minCancel0.6%Flights2,222
- SkyWest AirlinesOn-time74%Medianon timep9040 minCancel0.0%Flights419
- Alaska AirlinesOn-time73%Medianon timep9035 minCancel1.9%Flights1,355
Why flights run late
Delay causes
- Airline40%
- Weather5%
- Air traffic (NAS)24%
- Late aircraft31%
- Security0%
Most delay minutes here are attributed to Airline.
When flights don't go
Why flights were cancelled
- Airline56%
- Weather26%
- Air traffic (NAS)18%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 39 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 SLC → SEA
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 73% to 85% on time.
- Middays85% on time · p90 20 min · 2,877 flights
- Mornings85% on time · p90 20 min · 3,213 flights
- Evenings77% on time · p90 35 min · 1,934 flights
- Afternoons76% on time · p90 35 min · 1,932 flights
- Overnights73% on time · p90 40 min · 1,954 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 84% on time.
- Tuesdays84% on time · p90 25 min · 1,602 flights
- Wednesdays83% on time · p90 25 min · 1,598 flights
- Saturdays82% on time · p90 25 min · 1,510 flights
- Mondays80% on time · p90 30 min · 1,813 flights
- Thursdays79% on time · p90 30 min · 1,793 flights
- Fridays78% on time · p90 30 min · 1,806 flights
- Sundays78% on time · p90 35 min · 1,788 flights
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