Flight number record
AS 237
Alaska Airlines · Seattle to Lihue
- Route
- SEA → LIH
- Departs
- 18:13
- Flights
- 266
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 237, check with Alaska Airlines.
AS 237 lands a B+, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by about 50 minutes on average. That rests on 266 flights, with a median arrival 5 minutes early.
Key figures
On time
76.2%
Arrivals under 15 minutes late, of 261 completed flights
Avg delay
50 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
6.1%
National rate is 8.3%
These figures cover 266 flights between September 2025 and August 2026. The median arrival is 5 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.
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Schedule
When AS 237 flies
AS 237 flies SEA to LIH without a single fixed slot. Its most common scheduled departure was 18:13, used on 69 of 266 flights, with 18:15 (36 flights) and 17:49 (33 flights) next.
- Departs 18:1369 flights25.9%
- Departs 18:1536 flights13.5%
- Departs 17:4933 flights12.4%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 18:13 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and AS 237 runs 8 points better at 76.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
AS 237 next to SEA to LIH
Every carrier on SEA to LIH combined arrived on time 73.0% of the time across 1,094 flights, so AS 237 is 3 points ahead of it. Alaska flew 729 flights on the same city pair under all its flight numbers, including this one, and those ran 72.2% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 237thin sample | 266 | 76.2% | 50 min | 0.00% | B+ |
| All Alaska Airlines on SEA–LIH | 729 | 72.2% | 53 min | 0.27% | C+ |
| All carriers on SEA–LIH | 1,094 | 73.0% | 58 min | 0.73% | C+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 237 quarter by quarter
AS 237 did not run the same all year. Its best quarter was Apr–Jun 2026 at 83.5% on time and its weakest Jan–Mar 2026 at 69.0%, a swing of 15 points on roughly 89 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Oct–Dec 202524 flights—
- Jan–Mar 202690 flights69.0%
- Apr–Jun 202691 flights83.5%
- Jul–Sep 202661 flights80.3%
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, AS 237 did best on Wednesday at 86.5% on time and worst on Friday at 65.8%. Each day rests on about 38 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 237 runs when it is late
AS 237 often beats the schedule: 102 of 261 completed flights, 39%, arrived 15 minutes or more early. The 62 late arrivals split 25 under half an hour, 21 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early102 flights39.1%
- Within 15 min97 flights37.2%
- 15–29 min late25 flights9.6%
- 30–59 min late21 flights8.0%
- 1–2 hours late11 flights4.2%
- 2+ hours late5 flights1.9%
Scale runs 0% to 100%.
Share of 261 completed flights by arrival against schedule.
A late pushback is often recovered here: of 68 departures that left 15 minutes late or more, 24 still arrived on time. In the other direction, 18 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at LIH.
The worst days
Worst days for AS 237
The latest arrival of the period was on 14 June 2026, 3 hours 8 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 June 2026 | 3 hours 8 minutes | Carrier |
| 18 May 2026 | 2 hours 17 minutes | Carrier |
| 24 November 2025 | 2 hours 13 minutes | Carrier |
| 20 August 2026 | 2 hours 13 minutes | Carrier |
| 13 March 2026 | 2 hours 11 minutes | Late-arriving aircraft |
Delay causes
Why AS 237 runs late
Carrier accounts for 43% of the 3,088 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Carrier
- 34%Late-arriving aircraft
- 23%National Airspace System
- 0%Extreme weather
34% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,088 reported delay minutes here, that single category outweighs weather by 34 to one. The split is drawn from 3,088 delay minutes reported on AS 237.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
6.1% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 50 minutes, which a normal layover absorbs.
At 2,700 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 266 flights under AS 237 in the data flew SEA to LIH. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 266 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking AS 237
For a booking, read AS 237 as 76.2% on time with 0.00% cancelled over 266 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to LIH, every carrier and departure
- LIH to SEA, the return direction
- Delta Air Lines 345 on the same route74.7%
- Seattle-Tacoma International (SEA) delay statistics
- Alaska Airlines on-time record
- Every Alaska Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Alaska Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.