SEA to BOI flight delays & on-time performance
Nonstop flights from Seattle–Tacoma International Airport to Boise Air Terminal/Gowen Field · 399 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SEA or BOI right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Seattle (SEA) to Boise (BOI) arrived on time 86% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.2% were cancelled, and 4% arrived an hour or more late.
- SkyWest Airlines was the most punctual airline here (87% on time); Alaska Airlines was the least (81%).
- Departures scheduled around 8am did best (93% on time); around 9pm did worst (80%).
- Saturday was the most reliable day to fly (90% on time) and Thursday the least (83%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (53%).
Which airline is most on time from SEA to BOI?
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. | 87% | 0.2% | 8 min | 3.7% | 2,958 |
| Alaska Airlines | 81% | 0.3% | 9 min | 4.3% | 923 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am91%473 flights
- 8am93%191 flights
- 9am87%92 flights
- 10am88%363 flights
- 11am89%139 flights
- 12pm84%365 flights
- 1pm89%355 flights
- 2pm80%151 flights
- 3pm86%130 flights
- 4pm85%173 flights
- 5pm85%314 flights
- 6pm88%130 flights
- 7pm82%378 flights
- 8pm81%229 flights
- 9pm80%398 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday86%0.0% cancelled
- Tuesday89%0.0% cancelled
- Wednesday87%0.0% cancelled
- Thursday83%0.2% cancelled
- Friday84%1.0% cancelled
- Saturday90%0.2% cancelled
- Sunday83%0.2% 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)53%
- Late-arriving aircraft19%
- Extreme weather17%
- Air traffic control & airport congestion12%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather78%
- Airline (crew, maintenance, cleaning, fueling)11%
- Air traffic control & airport congestion11%
- Security0%
SEA to BOI: common questions
- How often are SEA to BOI flights on time?
- 86% 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 Seattle to Boise cancelled?
- 0.2% of scheduled flights were cancelled (9 of 3,881).
- How long are typical delays?
- Across all flights the average arrival delay was 8 min (early arrivals count as zero). Flights that were late arrived 51 min behind schedule on average, and 3.9% of flights were an hour or more late.
- How long is taxi time at SEA?
- Flights on this route spent 22 min taxiing from the gate to takeoff on average.
Related routes
Return trip: BOI to SEA — 85% on time
More flights from Seattle
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SEA → BOI, nonstop flights by US airlines that report to the DOT. How we calculate this.