Flight number record
AS 387
Alaska Airlines · Minneapolis to Seattle
- Route
- MSP → SEA
- Departs
- 07:00
- Flights
- 353
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 387, check with Alaska Airlines.
AS 387 lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 353 flights, with a median arrival 10 minutes early.
Set against the rest of the country, AS 387's record is 6 points better than the US average of 77.3%. That gap is worth roughly 63 fewer late arrivals for every thousand flights.
Key figures
On time
83.6%
Arrivals under 15 minutes late, of 348 completed flights
Avg delay
89 min
Across delayed arrivals only, not all flights
Cancelled
1.42%
National rate is 1.89%
1 hour+ late
4.0%
National rate is 8.3%
These figures cover 353 flights between September 2025 and August 2026. The median arrival is 10 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 387 flies
AS 387 flies MSP to SEA without a single fixed slot. Its most common scheduled departure was 07:00, used on 217 of 353 flights, with 06:03 (70 flights) next.
- Departs 07:00217 flights61.5%
- Departs 06:0370 flights19.8%
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 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 6 points worse at 83.6%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
AS 387 next to MSP to SEA
Every carrier on MSP to SEA combined arrived on time 80.9% of the time across 2,676 flights, so AS 387 is 3 points ahead of it. Alaska flew 931 flights on the same city pair under all its flight numbers, including this one, and those ran 81.4% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 387thin sample | 353 | 83.6% | 89 min | 1.42% | B |
| All Alaska Airlines on MSP–SEA | 931 | 81.4% | 69 min | 1.18% | B |
| All carriers on MSP–SEA | 2,676 | 80.9% | 62 min | 0.97% | B+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | 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 100.0% on time and its weakest Jan–Mar 2026 at 68.6%, a swing of 31 points on roughly 71 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 flights100.0%
- Oct–Dec 202581 flights75.0%
- Jan–Mar 202689 flights68.6%
- Apr–Jun 202691 flights94.5%
- Jul–Sep 202662 flights91.8%
Scale runs 60% to 100%.
By weekday, AS 387 ranged from 80.0% on Tuesday to 85.7% on Saturday. 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.
Arrival by arrival
How late AS 387 runs when it is late
AS 387 often beats the schedule: 146 of 348 completed flights, 42%, arrived 15 minutes or more early. Most of the lateness is short. 31 of the 57 late arrivals were under half an hour behind, and 14 reached an hour or more.
- 15+ min early146 flights42.0%
- Within 15 min145 flights41.7%
- 15–29 min late31 flights8.9%
- 30–59 min late12 flights3.4%
- 1–2 hours late3 flights0.9%
- 2+ hours late11 flights3.2%
Scale runs 0% to 100%.
Share of 348 completed flights by arrival against schedule.
A late pushback is often recovered here: of 41 departures that left 15 minutes late or more, 13 still arrived on time. In the other direction, 29 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 387
The latest arrival of the period was on 30 July 2026, 16 hours 19 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 July 2026 | 16 hours 19 minutes | Carrier |
| 6 July 2026 | 13 hours 43 minutes | Carrier |
| 20 June 2026 | 5 hours 53 minutes | Late-arriving aircraft |
| 7 August 2026 | 4 hours 55 minutes | National Airspace System |
| 14 December 2025 | 4 hours 29 minutes | Carrier |
Delay causes
Why AS 387 runs late
Carrier accounts for 63% of the 5,092 delay minutes carriers reported here, and the remaining four split what is left.
- 63%Carrier
- 27%National Airspace System
- 8%Late-arriving aircraft
- 1%Extreme weather
- 0%Security
The largest share of delay minutes, 63%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,231 of the 5,092 delay minutes reported here. The split is drawn from 5,092 delay minutes reported on AS 387.
Cancellations sit at 1.42% against a national 1.89%, 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 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 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.
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 83.6% on time with 1.42% 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 route87.0%
- Delta Air Lines 881 on the same route73.2%
- Delta Air Lines 877 on the same route71.7%
- Delta Air Lines 889 on the same route85.4%
- Alaska Airlines 555 on the same route77.3%
- 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 7.05 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.