Flight number record
AS 738
Alaska Airlines · Seattle to Las Vegas
- Route
- SEA → LAS
- Departs
- 11:31
- Flights
- 324
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 738, check with Alaska Airlines.
AS 738 lands a B+, about a point better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 45 minutes on average. That rests on 324 flights, with a median arrival 5 minutes early.
Key figures
On time
78.3%
Arrivals under 15 minutes late, of 323 completed flights
Avg delay
47 min
Across delayed arrivals only, not all flights
Cancelled
0.31%
National rate is 1.89%
1 hour+ late
5.3%
National rate is 8.3%
These figures cover 324 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 738 flies
AS 738 flies SEA to LAS without a single fixed slot. Its most common scheduled departure was 11:31, used on 69 of 324 flights, with 12:03 (36 flights) next.
- Departs 11:3169 flights21.3%
- Departs 12:0336 flights11.1%
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 11:31 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and AS 738 runs level with that at 78.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
AS 738 next to SEA to LAS
Every carrier on SEA to LAS combined arrived on time 77.6% of the time across 5,620 flights, so AS 738 is about level with it. Alaska flew 2,612 flights on the same city pair under all its flight numbers, including this one, and those ran 78.7% on time. Across its whole network Alaska Airlines managed 79.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 738thin sample | 324 | 78.3% | 47 min | 0.31% | B+ |
| All Alaska Airlines on SEA–LAS | 2,612 | 78.7% | 48 min | 0.84% | B+ |
| All carriers on SEA–LAS | 5,620 | 77.6% | 56 min | 0.93% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 738 quarter by quarter
Quarter by quarter AS 738 held fairly steady: 79.5% in Oct–Dec 2025, 82.6% in Jan–Mar 2026, 81.0% in Apr–Jun 2026 and 74.2% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202529 flights—
- Oct–Dec 202584 flights79.5%
- Jan–Mar 202686 flights82.6%
- Apr–Jun 202663 flights81.0%
- Jul–Sep 202662 flights74.2%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, AS 738 did best on Sunday at 85.4% on time and worst on Friday at 71.1%. Each day rests on about 46 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 738 runs when it is late
The 70 late arrivals split 28 under half an hour, 25 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early69 flights21.4%
- Within 15 min184 flights57.0%
- 15–29 min late28 flights8.7%
- 30–59 min late25 flights7.7%
- 1–2 hours late14 flights4.3%
- 2+ hours late3 flights0.9%
Scale runs 0% to 100%.
Share of 323 completed flights by arrival against schedule.
18 of 74 late departures made up the time and arrived on time, 24% of them. 14 flights left on time and still arrived late.
The worst days
Worst days for AS 738
The latest arrival of the period was on 26 July 2026, 4 hours 13 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across July, March, November, August and September, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 July 2026 | 4 hours 13 minutes | Carrier |
| 13 March 2026 | 4 hours 11 minutes | Extreme weather |
| 18 November 2025 | 2 hours 22 minutes | National Airspace System |
| 31 August 2026 | 1 hour 38 minutes | Late-arriving aircraft |
| 26 September 2025 | 1 hour 31 minutes | Carrier |
Delay causes
Why AS 738 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,319 reported delay minutes.
- 32%Carrier
- 31%Late-arriving aircraft
- 28%National Airspace System
- 8%Extreme weather
No single cause dominates. carrier at 32%, late-arriving aircraft at 31% and national airspace system at 28% split the 3,319 reported delay minutes between them. An even spread like this usually means the operation is running close to its designed capacity with no one obvious weak point, and it is the hardest pattern for a traveller to route around. The split is drawn from 3,319 delay minutes reported on AS 738.
Cancellations are rare at 0.31%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
5.3% 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 roughly 45 minutes, which a normal layover absorbs.
The 867 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on one other city pair in the data, including ANC to LAX (1), but none flew often enough under AS 738 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to LAS only.
One caution: this is a thin sample. 324 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 738
For a booking, read AS 738 as 78.3% on time with 0.31% cancelled over 324 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to LAS, every carrier and departure
- LAS to SEA, the return direction
- Delta Air Lines 2922 on the same route91.1%
- Delta Air Lines 2905 on the same route82.9%
- Delta Air Lines 2880 on the same route80.1%
- Delta Air Lines 2949 on the same route78.9%
- Alaska Airlines 478 on the same route73.3%
- Alaska Airlines 704 on the same route84.2%
- Seattle-Tacoma International (SEA) delay statistics
- Harry Reid International (LAS) 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
- Worst months to fly in the US, ranked by the data
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.