Flight number record
AS 1
Alaska Airlines · Washington to Seattle
- Route
- DCA → SEA
- Departs
- 08:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 1, check with Alaska Airlines.
AS 1 lands a B, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about 40 minutes on average. That rests on 365 flights, with a median arrival 8 minutes early.
Key figures
On time
79.9%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
41 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
1 hour+ late
3.3%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 8 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.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When AS 1 flies
AS 1 is scheduled to leave Washington (DCA) at 08:00 local time and reach Seattle (SEA) at 10:58. That slot held for 365 of the 365 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 08:00365 flights100.0%
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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and AS 1 runs 4 points worse at 79.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
AS 1 next to DCA to SEA
Every carrier on DCA to SEA combined arrived on time 73.4% of the time across 1,092 flights, so AS 1 is 7 points ahead of it. Alaska flew 728 flights on the same city pair under all its flight numbers, including this one, and those ran 76.4% on time. Across its whole network Alaska Airlines managed 79.7%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 1 | 365 | 79.9% | 41 min | 1.10% | B |
| All Alaska Airlines on DCA–SEA | 728 | 76.4% | 50 min | 0.69% | B+ |
| All carriers on DCA–SEA | 1,092 | 73.4% | 66 min | 1.37% | C |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 1 quarter by quarter
AS 1 did not run the same all year. Its best quarter was Apr–Jun 2026 at 92.3% on time and its weakest Oct–Dec 2025 at 69.6%, a swing of 23 points on roughly 73 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 flights90.0%
- Oct–Dec 202592 flights69.6%
- Jan–Mar 202690 flights75.3%
- Apr–Jun 202691 flights92.3%
- Jul–Sep 202662 flights78.7%
Scale runs 60% to 100%.
By weekday, AS 1 did best on Saturday at 88.2% on time and worst on Wednesday at 75.0%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 1 runs when it is late
AS 1 often beats the schedule: 125 of 359 completed flights, 35%, arrived 15 minutes or more early. Most of the lateness is short. 39 of the 72 late arrivals were under half an hour behind, and 12 reached an hour or more.
- 15+ min early125 flights34.8%
- Within 15 min162 flights45.1%
- 15–29 min late39 flights10.9%
- 30–59 min late21 flights5.8%
- 1–2 hours late9 flights2.5%
- 2+ hours late3 flights0.8%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
7 of 34 late departures made up the time and arrived on time, 21% of them. In the other direction, 45 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 1
The latest arrival of the period was on 13 March 2026, 3 hours 16 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. Three of the five worst days fell in December 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 March 2026 | 3 hours 16 minutes | National Airspace System |
| 2 December 2025 | 3 hours 13 minutes | Late-arriving aircraft |
| 10 June 2026 | 2 hours 36 minutes | National Airspace System |
| 7 December 2025 | 1 hour 56 minutes | Carrier |
| 16 December 2025 | 1 hour 42 minutes | Carrier |
Delay causes
Why AS 1 runs late
National Airspace System accounts for 66% of the 2,942 delay minutes carriers reported here, and the remaining four split what is left.
- 66%National Airspace System
- 19%Carrier
- 9%Extreme weather
- 7%Late-arriving aircraft
66% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,934 minutes out of 2,942, against a national NAS share of 21%. The split is drawn from 2,942 delay minutes reported on AS 1.
Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.55%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.3% 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.
At 2,329 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 365 flights under AS 1 in the data flew DCA to SEA. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 365 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 1
For a booking, read AS 1 as 79.9% on time with 1.10% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DCA to SEA, every carrier and departure
- SEA to DCA, the return direction
- Alaska Airlines 3 on the same route72.9%
- Ronald Reagan Washington National (DCA) 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
- Worst months to fly in the US, ranked by the data
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.