Flight number record
AS 387
Alaska Airlines · Minneapolis to Seattle
- Route
- MSP → SEA
- Departs
- 07:00
- Flights
- 353
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s AS 387, check with Alaska Airlines.
AS 387 earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 353 flights, with a median arrival 13 minutes early.
Set against the rest of the country, AS 387's record is 7 points better than the US average of 77.6%. That gap is worth roughly 66 fewer late arrivals for every thousand flights.
Key figures
On time
84.2%
Arrivals under 15 minutes late, of 349 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
1.13%
National rate is 1.81%
1 hour+ late
3.4%
National rate is 8.1%
These figures cover 353 flights between July 2025 and June 2026. The median arrival is 13 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.
Schedule
When AS 387 flies
AS 387 flies MSP to SEA without a single fixed slot. Its most common scheduled departure was 07:00, used on 204 of 353 flights, with 06:40 (50 flights) and 06:05 (45 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 07:00204 flights57.8%
- Departs 06:4050 flights14.2%
- Departs 06:0545 flights12.7%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and AS 387 runs 5 points worse at 84.2%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
AS 387 next to MSP to SEA
Every carrier on MSP to SEA combined arrived on time 81.1% of the time across 2,690 flights, so AS 387 is 3 points ahead of it. Alaska flew 953 flights on the same city pair under all its flight numbers, including this one, and those ran 79.4% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 387thin sample | 353 | 84.2% | 58 min | 1.13% | B |
| All Alaska Airlines on MSP–SEA | 953 | 79.4% | 56 min | 1.26% | B |
| All carriers on MSP–SEA | 2,690 | 81.1% | 58 min | 1.04% | B |
| Alaska Airlines, whole network | 293,372 | 79.1% | 52 min | 1.28% | B |
Across the year
AS 387 quarter by quarter
AS 387 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jan–Mar 2026 at 68.6%, a swing of 28 points on roughly 88 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 202592 flights96.7%
- Oct–Dec 202581 flights75.0%
- Jan–Mar 202689 flights68.6%
- Apr–Jun 202691 flights94.5%
Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, AS 387 ranged from 81.2% on Sunday to 87.5% on Friday. With about 50 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.
Delay causes
Why AS 387 runs late
One category carries most of the weight here. Carrier accounts for 51% of the 3,174 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 51%Carrier
- 34%National Airspace System
- 13%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 51%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,613 of the 3,174 delay minutes reported here. The split is drawn from 3,174 delay minutes reported on AS 387.
Cancellations sit at 1.13% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.4% land an hour or more behind schedule, against 8.1% 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 1,399 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on one other city pair in the data, including BOS to PDX (3), but none flew often enough under AS 387 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MSP to SEA only.
One caution: this is a thin sample. 353 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 387
For a booking, read AS 387 as 84.2% on time with 1.13% cancelled over 353 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- MSP to SEA, every carrier and departure
- SEA to MSP, the return direction
- Delta Air Lines 868 on the same route86.7%
- Delta Air Lines 877 on the same route75.9%
- Delta Air Lines 881 on the same route73.1%
- Delta Air Lines 889 on the same route87.2%
- Alaska Airlines 555 on the same route75.2%
- Minneapolis-St Paul International (MSP) 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
- The best time of day to fly, according to 7.04 million flight records
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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.