Flight profile · Alaska Airlines
AS678
Seattle (SEA) to Las Vegas (LAS) · scheduled 1:14 PM – 3:50 PM
How AS678 performs
607 operations, November 2023 – August 2026.
Between its first and last recorded date on SEA → LAS, AS678 averaged about 4 operations a week (607 in 1,019 days, cancelled ones included).
AS678 arrived on time 74.1% of the time, against 77.4% for all SEA → LAS flights, so this departure is 3.3 percentage points worse than the route as a whole. Against Alaska Airlines’ own flights on this route it is 1.2 points worse.
Source: US DOT Bureau of Transportation Statistics · 607 operations, November 2023 – August 2026 · If AS678 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where AS678 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| AS678 | 74.1% | 1.32% | -2 min | 7.0% | 607 |
| Alaska Airlines on SEA → LAS | 75.3% | 0.98% | -1 min | 5.7% | 8,563 |
| All SEA → LAS flights | 77.4% | 0.78% | -3 min | 5.8% | 19,716 |
AS678 cancelled 8 of 607 operations (1.32%), above the 0.78% for SEA → LAS.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – August 2026
Why AS678 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for AS678 on SEA → LAS. Only delays of 15 minutes or more are attributed. What the five causes mean
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – August 2026
Does a late aircraft delay this flight?
How often the plane that flies AS678 comes in late, and what that does to the departure.
The aircraft flying AS678 came in 15 or more minutes late on 17% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Matched by tail number to the aircraft’s previous flight into SEA: 543 of 599 departures. Unknown, cancelled or diverted inbounds and gaps over 12 hours are left out.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| AS678 | 17% |
| Network, same turn | 17% |
65 scheduled minutes is enough to clean and board when the aircraft is on time, with little to spare when it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often AS678’s aircraft landed 15 or more minutes late is about the same as the network’s. There are not enough departures in both groups to compare how it left.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – August 2026
From pushback to gate
When it leaves SEA late, does that still matter by the time it reaches LAS?
AS678 pushes back an average of 13.0 minutes late and reaches the gate at LAS an average of 8.3 minutes late. The 4.7 minutes between those two figures are slack the published schedule already carries, so a late pushback is partly, not fully, made up before the gate. Its 20.8 minutes on the taxiways at SEA is about what any departure from the airport in that hour spends.
On arrival at LAS, AS678 spends 9.7 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 2.0 minutes longer than a typical LAS arrival (7.7 min).
Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 30,514 SEA departures. Taxi-in is landing to gate, set against 583,484 arrivals at LAS. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – August 2026
The hour it leaves SEA
AS678 has one departure time, 1:14 PM, so this is what that hour at SEA is worth.
On-time arrival rate. 30,514 departures from SEA are scheduled in the 1 PM–2 PM hour over the period, against 526,113 across the whole day.
AS678 is scheduled out of SEA at 1:14 PM, in the 1 PM–2 PM bank. Departures from SEA in that hour arrive on time 76.4% of the time against 78.9% across the airport’s whole day, so the hour AS678 leaves in is an ordinary one for SEA and explains nothing about its record either way.
Both airport figures cover every destination from SEA, so they describe the slot, not this journey; the route comparison is above. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – August 2026 · Hours below 120 departures are not scored.
Other routes AS678 has flown
Carriers reassign flight numbers. AS678 also served these 4 other city pairs in the period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| PDX→SJC Portland to San Jose | June 10, 2026 – August 17, 2026 | 69 | — |
| BOS→SEA Boston to Seattle | May 13, 2026 | 1 | — |
| SLC→SEA Salt Lake City to Seattle | January 8, 2026 – March 17, 2026 | 51 | — |
| SEA→PSP Seattle to Palm Springs | October 4, 2025 | 1 | — |
The figures above describe only SEA → LAS, the route AS678 flies now.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
47 min late
against a median of 2 min early
Percentiles over 607 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – August 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL2922 | Delta Air Lines | 90.9% | 10 min early | 816 |
| DL2905 | Delta Air Lines | 87.1% | 7 min early | 769 |
| AS612 | Alaska Airlines | 84.8% | 3 min early | 903 |
| DL2880 | Delta Air Lines | 83.6% | 8 min early | 803 |
| DL2949 | Delta Air Lines | 80.8% | 6 min early | 770 |
| AS738 | Alaska Airlines | 77.4% | 2 min early | 1,078 |
| AS678 this flight | Alaska Airlines | 74.1% | 2 min early | 607 |
| AS688 | Alaska Airlines | 70.4% | 1 min late | 699 |
Among all 8 departures on this route with at least 600 operations, AS678 has the 7th highest on-time rate, 16.8 points behind the best. Every departure here has at least 600 operations; the other rows are the most punctual on the route, not all of them.
Data and methodology
Calculated by FlyerIntel from 607 records of AS678 operating SEA → LAS, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule; cancelled and diverted flights are reported separately, not in the on-time rate.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed