SEA (Seattle) to SLC (Salt Lake City) flights arrive on time 84% of the time. The most reliable airline on this route is Delta Air Lines at 88%. The average delay is 52 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated July 2026.SEA → SLC
SEA (Seattle) to SLC (Salt Lake City)
SEA → SLC on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is on time most of the time. About 84% of flights arrive on schedule.
Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Accurate?
Delta Air Lines edges out Frontier Airlines on this route — 88% vs 78% on time.
Airline Comparison
Delta Air Lines leads at 88% on time; Frontier Airlines trails at 78%.
Accurate?
Good to know
Departing from SEA
80% on timeExpect ~21 min sitting on the taxiway after your gate pushes back. SEA has long runway queues.
TSA is currently ~18 min. Best time: 4 AM (about 5 min).
Arriving at SLC
85% on timeWhen flights into SLC are late, the average delay is 70 minutes. Build buffer if you have ground plans.
If connecting at SLC: TSA is ~10 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what Delta Air Lines owes you — refund rights, action plan, complaint email. Free.
Flying out of SEA? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated July 2026. Source: Bureau of Transportation Statistics.