LAS to SEA flight delays
Las Vegas, NV (LAS) Seattle, WA (SEA) · 867 miles
477 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
77.85%
Arrived on time
Within 15 minutes of schedule
0.21%
Cancelled
Share of scheduled flights
69 min
When late, late by
Average across delayed arrivals
16 min
Delay per flight
Averaged over every flight flown
What the record says about this route
This route does better than its own airport. Departures from LAS overall run 13.8 points less punctual than this particular one — so whatever congestion LAS has, this route is largely escaping it.
This is a thin route — 477 flights across the whole period. On a route this infrequent a cancellation is far more costly than the rate suggests, because the next departure may not be the same day.
The 2 airlines here are separated by under 3 points — close enough to call a tie. Choose on price and departure time.
The Las Vegas to Seattle route sits close to the middle of the record — neither notably punctual nor notably late.
Which airline should you fly on this route?
Over March 2025 – August 2026, Delta Air Lines arrived on time most often on LAS to SEA. Alaska Airlines was late most often.
Every airline on LAS to SEA
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Alaska Airlines | 209 | 81.73% | 0.48% | 100 min | B |
| Delta Air Lines | 149 | 83.89% | 0% | 72 min | B |
| Southwest Airlines | 91 | 54.44% | 0% | 40 min | — |
| Frontier Airlines | 28 | 92.59% | 0% | 39 min | — |
The return leg
SEA to LAS Seattle back to Las Vegas 80.04% on time BOther routes from Las Vegas
Common questions
Are flights from Las Vegas to Seattle usually delayed?
77.85% of flights on the LAS to SEA route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airline is most on time from Las Vegas to Seattle?
Delta Air Lines, at 83.89% on time across 149 flights. The least punctual on the route was Alaska Airlines at 81.73%.
How often are LAS to SEA flights cancelled?
0.21% of scheduled flights did not operate — about 2 in every thousand. That is in the normal range.
When LAS to SEA flights are late, how late are they?
About 69 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on LAS to SEA during March 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →