BOI to SEA flight delays
Boise, ID (BOI) Seattle, WA (SEA) · 399 miles
312 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
81.73%
Arrived on time
Within 15 minutes of schedule
0%
Cancelled
Share of scheduled flights
46 min
When late, late by
Average across delayed arrivals
9 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Only SkyWest Airlines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
This is a thin route — 312 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 Boise 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, SkyWest Airlines arrived on time most often on BOI to SEA.
Every airline on BOI 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 |
|---|---|---|---|---|---|
| SkyWest Airlines | 222 | 84.68% | 0% | 56 min | B |
| Alaska Airlines | 90 | 74.44% | 0% | 31 min | — |
The return leg
SEA to BOI Seattle back to Boise 85.58% on time AOther routes from Boise
- BOI → DEN · Denver C
- BOI → PHX · Phoenix C
- BOI → SLC · Salt Lake City A
- BOI → SFO · San Francisco F
- BOI → LAX · Los Angeles A
- BOI → LAS · Las Vegas —
- BOI → ORD · Chicago —
- BOI → DFW · Dallas/Fort Worth —
- BOI → SAN · San Diego —
- BOI → SMF · Sacramento —
- BOI → MSP · Minneapolis —
- BOI → SJC · San Jose —
Common questions
Are flights from Boise to Seattle usually delayed?
81.73% of flights on the BOI to SEA route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is better than the average route in this record.
Which airlines fly from Boise to Seattle?
Only SkyWest Airlines appears in the published record on this route, with 222 flights and 84.68% arriving on time.
How often are BOI to SEA flights cancelled?
0% of scheduled flights did not operate — about 1 in every thousand. That is in the normal range.
When BOI to SEA flights are late, how late are they?
About 46 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 BOI 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 →