Flight number record
AS 733
Alaska Airlines · Seattle to Salt Lake City
- Route
- SEA → SLC
- Departs
- 11:51
- Flights
- 271
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 733, check with Alaska Airlines.
AS 733 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.3%. The late ones land roughly 40 minutes behind schedule. That rests on 271 flights, with a median arrival right on schedule.
The national on-time rate over the same period is 77.3%, so AS 733 runs 9 points behind the country as a whole. Across a thousand flights that is about 89 extra late arrivals.
Key figures
On time
68.4%
Arrivals under 15 minutes late, of 269 completed flights
Avg delay
39 min
Across delayed arrivals only, not all flights
Cancelled
0.74%
National rate is 1.89%
1 hour+ late
4.5%
National rate is 8.3%
These figures cover 271 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When AS 733 flies
AS 733 flies SEA to SLC without a single fixed slot. Its most common scheduled departure was 11:51, used on 70 of 271 flights, with 11:20 (33 flights) and 12:03 (29 flights) next.
- Departs 11:5170 flights25.8%
- Departs 11:2033 flights12.2%
- Departs 12:0329 flights10.7%
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 11:51 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and AS 733 runs 10 points worse at 68.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
AS 733 next to SEA to SLC
Every carrier on SEA to SLC combined arrived on time 83.4% of the time across 4,098 flights, so AS 733 is 15 points behind it. Alaska flew 1,424 flights on the same city pair under all its flight numbers, including this one, and those ran 79.6% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 733thin sample | 271 | 68.4% | 39 min | 0.74% | C+ |
| All Alaska Airlines on SEA–SLC | 1,424 | 79.6% | 40 min | 1.26% | B |
| All carriers on SEA–SLC | 4,098 | 83.4% | 49 min | 0.78% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 733 quarter by quarter
AS 733 did not run the same all year. Its best quarter was Apr–Jun 2026 at 78.6% on time and its weakest Jul–Sep 2026 at 56.5%, a swing of 22 points on roughly 54 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.
- Jul–Sep 202530 flights76.7%
- Oct–Dec 202587 flights70.6%
- Jan–Mar 202650 flights66.0%
- Apr–Jun 202642 flights78.6%
- Jul–Sep 202662 flights56.5%
Scale runs 50% to 85%.
By weekday, AS 733 did best on Wednesday at 77.5% on time and worst on Thursday at 57.5%. Each day rests on about 39 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 733 runs when it is late
The 85 late arrivals split 41 under half an hour, 32 between 30 and 60 minutes, and 12 an hour or more.
- 15+ min early39 flights14.5%
- Within 15 min145 flights53.9%
- 15–29 min late41 flights15.2%
- 30–59 min late32 flights11.9%
- 1–2 hours late10 flights3.7%
- 2+ hours late2 flights0.7%
Scale runs 0% to 100%.
Share of 269 completed flights by arrival against schedule.
21 of 95 late departures made up the time and arrived on time, 22% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for AS 733
The latest arrival of the period was on 3 November 2025, 3 hours 21 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 November 2025 | 3 hours 21 minutes | Carrier |
| 16 October 2025 | 2 hours 39 minutes | Late-arriving aircraft |
| 10 December 2025 | 1 hour 37 minutes | Late-arriving aircraft |
| 16 July 2026 | 1 hour 31 minutes | Late-arriving aircraft |
| 27 June 2026 | 1 hour 24 minutes | Carrier |
Delay causes
Why AS 733 runs late
Late-arriving aircraft accounts for 47% of the 3,303 delay minutes carriers reported here, and the remaining four split what is left.
- 47%Late-arriving aircraft
- 40%Carrier
- 12%National Airspace System
- 1%Extreme weather
47% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,303 reported delay minutes here, that single category outweighs weather by 47 to one. The split is drawn from 3,303 delay minutes reported on AS 733.
Cancellations are rare at 0.74%, 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
Badly late arrivals are rare here: only 4.5% land an hour or more behind schedule, against 8.3% 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.
The 689 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 two other city pairs in the data, including OAK to SEA (49) and PDX to ANC (34), but none flew often enough under AS 733 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to SLC only.
One caution: this is a thin sample. 271 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 733
For a booking, AS 733 is one of the weaker ways to fly SEA to SLC: 15 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- SEA to SLC, every carrier and departure
- SLC to SEA, the return direction
- Delta Air Lines 1016 on the same route90.0%
- Delta Air Lines 1120 on the same route83.0%
- Delta Air Lines 1128 on the same route93.7%
- Delta Air Lines 1265 on the same route85.1%
- Delta Air Lines 1165 on the same route80.4%
- SkyWest Airlines 3298 on the same route79.3%
- Seattle-Tacoma International (SEA) delay statistics
- Salt Lake City International (SLC) 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.