Flight Reliability
AS 991 · Alaska Airlines
Seattle → Honolulu (SEA–HNL)90% of its flights flew this route. The rest (LIH–SMF) are included in these numbers.
49
Bring Snacks
WanderNerd Reliability Score
- 58%
- Arrive within 15 minutes
- 32 min
- Average arrival delay
- 1.6%
- Cancelled
- 7 min
- Median arrival delay
Based on 122 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
AS 991 departing between 12–3 PM arrived on time 75% of the time, versus 57% between 3–6 PM.
Monday is the weak spot.
AS 991 arrived on time 63% of the time on Fridays. On Mondays: 50%.
Lagging the SEA–HNL route.
AS 991 arrived on time 58% of the time, versus 66% across the SEA–HNL route.
Well behind the Alaska Airlines network.
AS 991 arrived on time 58% of the time, versus 80% across the Alaska Airlines network.
The breakdown
- Mon50%(16 flights)
- Tue61%(18 flights)
- Wed60%(15 flights)
- Thu56%(18 flights)
- Fri63%(19 flights)
- Sat63%(16 flights)
- Sun56%(18 flights)
- 12–3 PM75%(12 flights)
- 3–6 PM57%(108 flights)
80%
Apr
Jan 63% → Apr 80% on time
| Month | On-time percentage | Flights |
|---|---|---|
| January 2026 | 63% | 30 |
| February 2026 | 44% | 27 |
| March 2026 | 45% | 31 |
| April 2026 | 80% | 25 |
- Departures on time
- 63%
- Diverted
- 0%
- Flights flown
- 120
- Months covered
- 5
Same route, other flights
Keep nerding
Based on 122 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.