Flight number record
AS 734
Alaska Airlines · Salt Lake City to Seattle
- Route
- SLC → SEA
- Departs
- 16:00
- Flights
- 275
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 734, check with Alaska Airlines.
AS 734 draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is roughly 40 minutes behind schedule. Build slack into anything you connect to. That rests on 275 flights, with a median arrival right on schedule.
The national on-time rate over the same period is 77.3%, so AS 734 runs 11 points behind the country as a whole. Across a thousand flights that is about 114 extra late arrivals.
Key figures
On time
65.9%
Arrivals under 15 minutes late, of 273 completed flights
Avg delay
39 min
Across delayed arrivals only, not all flights
Cancelled
0.73%
National rate is 1.89%
1 hour+ late
4.0%
National rate is 8.3%
These figures cover 275 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.
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Schedule
When AS 734 flies
AS 734 flies SLC to SEA without a single fixed slot. Its most common scheduled departure was 16:00, used on 69 of 275 flights, with 09:00 (35 flights) and 15:29 (33 flights) next.
- Departs 16:0069 flights25.1%
- Departs 09:0035 flights12.7%
- Departs 15:2933 flights12.0%
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 16:00 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and AS 734 runs 6 points worse at 65.9%. 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 734 next to SLC to SEA
Every carrier on SLC to SEA combined arrived on time 79.9% of the time across 4,098 flights, so AS 734 is 14 points behind it. Alaska flew 1,421 flights on the same city pair under all its flight numbers, including this one, and those ran 77.3% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 734thin sample | 275 | 65.9% | 39 min | 0.73% | C+ |
| All Alaska Airlines on SLC–SEA | 1,421 | 77.3% | 48 min | 1.41% | B |
| All carriers on SLC–SEA | 4,098 | 79.9% | 55 min | 0.81% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 734 quarter by quarter
AS 734 did not run the same all year. Its best quarter was Apr–Jun 2026 at 81.0% on time and its weakest Jul–Sep 2026 at 47.5%, a swing of 34 points on roughly 55 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 flights70.0%
- Oct–Dec 202587 flights72.9%
- Jan–Mar 202655 flights61.8%
- Apr–Jun 202642 flights81.0%
- Jul–Sep 202661 flights47.5%
Scale runs 40% to 85%.
By weekday, AS 734 did best on Friday at 74.4% on time and worst on Thursday at 50.0%. Each day rests on about 39 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 734 runs when it is late
The 93 late arrivals split 40 under half an hour, 42 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early53 flights19.4%
- Within 15 min127 flights46.5%
- 15–29 min late40 flights14.7%
- 30–59 min late42 flights15.4%
- 1–2 hours late9 flights3.3%
- 2+ hours late2 flights0.7%
Scale runs 0% to 100%.
Share of 273 completed flights by arrival against schedule.
13 of 81 late departures made up the time and arrived on time, 16% of them. In the other direction, 25 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 SEA.
The worst days
Worst days for AS 734
The latest arrival of the period was on 3 November 2025, 3 hours 1 minute behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 November 2025 | 3 hours 1 minute | Late-arriving aircraft |
| 16 October 2025 | 2 hours 31 minutes | Late-arriving aircraft |
| 23 October 2025 | 1 hour 42 minutes | National Airspace System |
| 16 July 2026 | 1 hour 31 minutes | Late-arriving aircraft |
| 10 December 2025 | 1 hour 27 minutes | Late-arriving aircraft |
Delay causes
Why AS 734 runs late
Late-arriving aircraft accounts for 60% of the 3,590 delay minutes carriers reported here, and the remaining four split what is left.
- 60%Late-arriving aircraft
- 29%National Airspace System
- 9%Carrier
- 2%Extreme weather
- 0%Security
60% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,590 reported delay minutes here, that single category outweighs weather by 31 to one. The split is drawn from 3,590 delay minutes reported on AS 734.
Cancellations are rare at 0.73%, 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 4.0% 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 SEA to OAK (49) and ANC to PDX (34), but none flew often enough under AS 734 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SLC to SEA only.
One caution: this is a thin sample. 275 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 734
For a booking, AS 734 is one of the weaker ways to fly SLC to SEA: 14 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
- SLC to SEA, every carrier and departure
- SEA to SLC, the return direction
- Delta Air Lines 2874 on the same route92.6%
- Delta Air Lines 2995 on the same route87.1%
- Delta Air Lines 2817 on the same route77.3%
- Delta Air Lines 871 on the same route80.3%
- Alaska Airlines 796 on the same route83.9%
- Delta Air Lines 2921 on the same route84.0%
- Salt Lake City International (SLC) delay statistics
- 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.