Route reliability record
ITO→HNL
Hilo to Honolulu
- Flights
- 6,336
- Period
- June 2025 to May 2026
- Distance
- 216 mi
- Carriers
- 3
This route earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.4%. When something does go wrong the average delay runs roughly 45 minutes. That rests on 6,336 flights, of which Southwest Airlines flew 1,857 at 93.9% on time.
Southwest Airlines is the most reliable of the three carriers covered here at 93.9% on time across 1,857 flights.
Key figures
On time
84.2%
Arrivals under 15 minutes late, of 6,269 completed flights
Avg delay
43 min
Across delayed arrivals only, not all flights
Cancelled
1.04%
National rate is 1.80%
Best carrier
Southwest
93.9% on time across 1,857 flights
These figures cover 6,336 flights between June 2025 and May 2026. The median arrival is 2 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
Carrier by carrier
Which airline is most reliable on ITO to HNL
The choice of carrier is not cosmetic here. Southwest Airlines arrives on time 93.9% of the time; Alaska Airlines manages 73.3%. Sample sizes sit next to every figure, because a two-point gap across 1,893 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Southwest Airlines | 1,857 | 93.9% | 61 min | 0.92% | A+ |
| Hawaiian Airlines | 2,586 | 85.2% | 37 min | 0.43% | A+ |
| Alaska Airlines | 1,893 | 73.3% | 44 min | 2.01% | C |
The spread between Southwest and Alaska is 21 points, wide enough that it should decide the booking. On a hundred trips that is 21 more arrivals inside the on-time window.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 18 points, against 21 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am1,085 flights95.6%
- 8am–11am934 flights90.2%
- 11am–2pm1,250 flights83.9%
- 2pm–5pm1,227 flights77.5%
- 5pm–8pm1,423 flights78.1%
- 8pm–5am417 flights82.6%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 95.6% of the time, against 77.5% for the afternoon window. That is 18 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on.
Across the year
When delays peak on this route
This route's year swings by 18 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
September is the best month on the calendar at 94.5% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back.
Across the week, Monday is the strongest day at 86.1% on time and Friday the weakest at 78.2%. 8 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. Late-arriving aircraft accounts for 65% of the 42,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 65%Late-arriving aircraft
- 26%Carrier
- 5%National Airspace System
- 3%Extreme weather
65% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 42,000 reported delay minutes here, that single category outweighs weather by 20 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 95.6% on time here.
Cancellations sit at 1.04% against a national 1.80%, which is ordinary. Diversions add another 0.02%.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 3.0% land an hour or more behind schedule, against 8.2% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 216 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg runs 85.7% on time across 6,340 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 6,336 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 94.5% on time and March 76.6%, a swing of 18 points. If the dates move at all, move them out of March before you think about anything else.
Common questions
ITO to HNL questions
How often is ITO to HNL delayed?
About one flight in six arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 15.8% of the 6,336 flights in this analysis, against 22.6% nationally. Delayed flights are late by roughly 45 minutes on average.
Which airline is most reliable on ITO to HNL?
Southwest Airlines leads at 93.9% on time across 1,857 flights. Alaska Airlines is at the other end on 73.3%, a gap of 21 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on ITO to HNL?
The 5am–8am departure window is the strongest at 95.6% on time. The 2pm–5pm window is the weakest at 77.5%, 18 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are March delays on ITO to HNL?
March is the weakest month at 76.6% on time, compared with 94.5% in September. Across the year that is 18 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- HNL to ITO — the return legseparate record
- Daniel K. Inouye International (HNL) delay statistics
- Southwest Airlines on-time record93.9%
- Hawaiian Airlines on-time record85.2%
- Alaska Airlines on-time record73.3%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. ITO to HNL and HNL to ITO are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, June 2025 to May 2026. Updated monthly. How this data is collected.