Flight Reliability
HA 21 · Hawaiian Airlines
Seattle → Honolulu (SEA–HNL)
83
Pretty Reliable
WanderNerd Reliability Score
- 79%
- Arrive within 15 minutes
- 12 min
- Average arrival delay
- 0.7%
- Cancelled
- 1 min
- Median arrival delay
Based on 147 historical flights. Data through May 2026.
What the data says
The 9 AM–12 PM departure wins.
HA 21 departing between 9 AM–12 PM arrived on time 86% of the time, versus 76% between 6–9 AM.
Friday is doing you no favors.
HA 21 arrived on time 91% of the time on Wednesdays and just 67% on Fridays. That gap is worth planning around.
Better than the SEA–HNL route average.
HA 21 arrived on time 79% of the time, versus 66% across the SEA–HNL route.
A bit behind the Hawaiian Airlines network.
HA 21 arrived on time 79% of the time, versus 83% across the Hawaiian Airlines network.
The breakdown
- Mon67%(21 flights)
- Tue81%(21 flights)
- Wed91%(21 flights)
- Thu81%(21 flights)
- Fri67%(21 flights)
- Sat81%(21 flights)
- Sun85%(20 flights)
- 6–9 AM76%(104 flights)
- 9 AM–12 PM86%(42 flights)
88%
Oct
Jun 73% → Oct 88% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 73% | 30 |
| July 2025 | 71% | 31 |
| August 2025 | 77% | 31 |
| September 2025 | 87% | 30 |
| October 2025 | 88% | 24 |
- Departures on time
- 75%
- Diverted
- 0%
- Flights flown
- 146
- Months covered
- 5
Same route, other flights
Keep nerding
Based on 147 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.