Alaska Airlines BOS to SEA on-time performance
Alaska Airlines nonstop flights from Boston to Seattle · Aug 2025 – Jul 2026
On-time arrivals
71%
arrived < 15 min late
Cancelled
1.1%
14 flights
Avg arrival delay
16 min
50 min when late
Rank on route
#3 of 3
route average 72% on time
Key facts
- Alaska Airlines flights on BOS to SEA arrived on time 71% of the time in Aug 2025 – Jul 2026.
- 1.1% were cancelled, and 7% arrived an hour or more late.
- That ranks #3 of 3 airlines on this route, which averaged 72% on time overall.
- The largest source of delay minutes was late-arriving aircraft (46%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft46%
- Air traffic control & airport congestion37%
- Airline (crew, maintenance, cleaning, fueling)14%
- Extreme weather4%
- Security0%
Other airlines on BOS to SEA
- Delta Air Lines73% on time · 17 min avg delay
- JetBlue79% on time · 16 min avg delay
Full BOS to SEA comparison →
Alaska Airlines on-time record across all routes →
1,222 Alaska Airlines flights tracked on this route; 14 cancelled, 7 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.