Flight number record
AS 552
Alaska Airlines · Las Vegas to Seattle
- Route
- LAS → SEA
- Departs
- 17:42
- Flights
- 278
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 552, check with Alaska Airlines.
AS 552 lands a B, 4 points better than the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 278 flights, with a median arrival 7 minutes early.
Set against the rest of the country, AS 552's record is 4 points better than the US average of 77.3%. That gap is worth roughly 42 fewer late arrivals for every thousand flights.
Key figures
On time
81.5%
Arrivals under 15 minutes late, of 275 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
1.08%
National rate is 1.89%
1 hour+ late
5.1%
National rate is 8.3%
These figures cover 278 flights between September 2025 and August 2026. The median arrival is 7 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 552 flies
AS 552 flies LAS to SEA without a single fixed slot. Its most common scheduled departure was 17:42, used on 59 of 278 flights, with 17:46 (53 flights) and 17:44 (39 flights) next.
- Departs 17:4259 flights21.2%
- Departs 17:4653 flights19.1%
- Departs 17:4439 flights14.0%
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 17:42 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and AS 552 runs 14 points better at 81.5%. 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 552 next to LAS to SEA
Every carrier on LAS to SEA combined arrived on time 82.1% of the time across 5,617 flights, so AS 552 is about level with it. Alaska flew 2,610 flights on the same city pair under all its flight numbers, including this one, and those ran 83.2% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 552thin sample | 278 | 81.5% | 56 min | 1.08% | B |
| All Alaska Airlines on LAS–SEA | 2,610 | 83.2% | 66 min | 1.19% | B |
| All carriers on LAS–SEA | 5,617 | 82.1% | 64 min | 1.00% | B |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 552 quarter by quarter
AS 552 did not run the same all year. Its best quarter was Jan–Mar 2026 at 88.8% on time and its weakest Oct–Dec 2025 at 73.9%, a swing of 15 points on roughly 93 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 202529 flights—
- Oct–Dec 202591 flights73.9%
- Jan–Mar 202680 flights88.8%
- Apr–Jun 202670 flights82.9%
- Jul–Sep 20268 flights—
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, AS 552 did best on Tuesday at 92.5% on time and worst on Sunday at 73.0%. Each day rests on about 40 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 552 runs when it is late
AS 552 often beats the schedule: 89 of 275 completed flights, 32%, arrived 15 minutes or more early. The 51 late arrivals split 21 under half an hour, 16 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early89 flights32.4%
- Within 15 min135 flights49.1%
- 15–29 min late21 flights7.6%
- 30–59 min late16 flights5.8%
- 1–2 hours late5 flights1.8%
- 2+ hours late9 flights3.3%
Scale runs 0% to 100%.
Share of 275 completed flights by arrival against schedule.
A late pushback is often recovered here: of 61 departures that left 15 minutes late or more, 23 still arrived on time. 13 flights left on time and still arrived late.
The worst days
Worst days for AS 552
The latest arrival of the period was on 1 October 2025, 3 hours 3 minutes 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 |
|---|---|---|
| 1 October 2025 | 3 hours 3 minutes | Late-arriving aircraft |
| 26 October 2025 | 2 hours 57 minutes | Late-arriving aircraft |
| 26 September 2025 | 2 hours 51 minutes | Late-arriving aircraft |
| 16 February 2026 | 2 hours 45 minutes | Carrier |
| 18 September 2025 | 2 hours 26 minutes | Late-arriving aircraft |
Delay causes
Why AS 552 runs late
Late-arriving aircraft accounts for 67% of the 2,831 delay minutes carriers reported here, and the remaining four split what is left.
- 67%Late-arriving aircraft
- 19%National Airspace System
- 11%Carrier
- 4%Extreme weather
67% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,831 reported delay minutes here, that single category outweighs weather by 18 to one. The split is drawn from 2,831 delay minutes reported on AS 552.
Cancellations sit at 1.08% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
5.1% 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 an hour, 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 BUR to HNL (49), but none flew often enough under AS 552 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LAS to SEA only.
One caution: this is a thin sample. 278 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 552
For a booking, read AS 552 as 81.5% on time with 1.08% cancelled over 278 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- LAS to SEA, every carrier and departure
- SEA to LAS, the return direction
- Delta Air Lines 2844 on the same route94.7%
- Alaska Airlines 676 on the same route77.1%
- Alaska Airlines 629 on the same route88.3%
- Alaska Airlines 479 on the same route84.4%
- Delta Air Lines 2880 on the same route84.5%
- Alaska Airlines 701 on the same route95.5%
- Harry Reid International (LAS) 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.