BOI to SEA flight delays & on-time performance
Nonstop flights from Boise Air Terminal/Gowen Field to Seattle–Tacoma International Airport · 399 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BOI or SEA right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Boise (BOI) to Seattle (SEA) arrived on time 85% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.4% were cancelled, and 4% arrived an hour or more late.
- SkyWest Airlines was the most punctual airline here (86% on time); Alaska Airlines was the least (82%).
- Departures scheduled around 5am did best (95% on time); around 6pm did worst (71%).
- Saturday was the most reliable day to fly (89% on time) and Thursday the least (80%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (52%).
Which airline is most on time from BOI to SEA?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 86% | 0.3% | 9 min | 4.0% | 2,838 |
| Alaska Airlines | 82% | 0.7% | 10 min | 3.8% | 923 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am95%307 flights
- 6am92%415 flights
- 7am93%280 flights
- 8am90%261 flights
- 9am81%321 flights
- 10am90%218 flights
- 11am90%223 flights
- 12pm88%77 flights
- 1pm88%261 flights
- 2pm87%156 flights
- 3pm85%129 flights
- 4pm73%272 flights
- 5pm86%199 flights
- 6pm71%319 flights
- 7pm78%226 flights
- 8pm65%71 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday86%0.2% cancelled
- Tuesday88%0.0% cancelled
- Wednesday85%0.2% cancelled
- Thursday80%0.4% cancelled
- Friday84%1.6% cancelled
- Saturday89%0.2% cancelled
- Sunday84%0.0% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)52%
- Air traffic control & airport congestion23%
- Extreme weather13%
- Late-arriving aircraft12%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather64%
- Airline (crew, maintenance, cleaning, fueling)29%
- Air traffic control & airport congestion7%
- Security0%
BOI to SEA: common questions
- How often are BOI to SEA flights on time?
- 85% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Boise to Seattle cancelled?
- 0.4% of scheduled flights were cancelled (14 of 3,761).
- How long are typical delays?
- Across all flights the average arrival delay was 9 min (early arrivals count as zero). Flights that were late arrived 57 min behind schedule on average, and 4.0% of flights were an hour or more late.
- How long is taxi time at BOI?
- Flights on this route spent 22 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SEA to BOI — 86% on time
More flights from Boise
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BOI → SEA, nonstop flights by US airlines that report to the DOT. How we calculate this.