Flight number record
AS 442
Alaska Airlines · Seattle to Philadelphia
- Route
- SEA → PHL
- Departs
- 08:28
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 442, check with Alaska Airlines.
AS 442 sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land roughly 45 minutes behind schedule. That rests on 364 flights, with a median arrival 2 minutes early.
Key figures
On time
74.9%
Arrivals under 15 minutes late, of 354 completed flights
Avg delay
47 min
Across delayed arrivals only, not all flights
Cancelled
1.65%
National rate is 1.89%
1 hour+ late
5.4%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 2 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 442 flies
AS 442 flies SEA to PHL without a single fixed slot. Its most common scheduled departure was 08:28, used on 70 of 364 flights, with 09:59 (54 flights) next.
- Departs 08:2870 flights19.2%
- Departs 09:5954 flights14.8%
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 08:28 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and AS 442 runs 9 points worse at 74.9%. 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 442 next to SEA to PHL
Every carrier on SEA to PHL combined arrived on time 82.7% of the time across 1,431 flights, so AS 442 is 8 points behind it. Alaska flew 657 flights on the same city pair under all its flight numbers, including this one, and those ran 80.7% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 442thin sample | 364 | 74.9% | 47 min | 1.65% | C |
| All Alaska Airlines on SEA–PHL | 657 | 80.7% | 46 min | 1.07% | B |
| All carriers on SEA–PHL | 1,431 | 82.7% | 70 min | 1.54% | B |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 442 quarter by quarter
AS 442 did not run the same all year. Its best quarter was Apr–Jun 2026 at 80.5% on time and its weakest Jul–Sep 2026 at 62.7%, a swing of 18 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 flights73.3%
- Oct–Dec 202591 flights78.9%
- Jan–Mar 202690 flights73.9%
- Apr–Jun 202691 flights80.5%
- Jul–Sep 202662 flights62.7%
Scale runs 55% to 85%.
By weekday, AS 442 did best on Wednesday at 80.0% on time and worst on Thursday at 66.7%. 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 442 runs when it is late
AS 442 often beats the schedule: 91 of 354 completed flights, 26%, arrived 15 minutes or more early. The 89 late arrivals split 42 under half an hour, 28 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early91 flights25.7%
- Within 15 min174 flights49.2%
- 15–29 min late42 flights11.9%
- 30–59 min late28 flights7.9%
- 1–2 hours late12 flights3.4%
- 2+ hours late7 flights2.0%
Scale runs 0% to 100%.
Share of 354 completed flights by arrival against schedule.
24 of 86 late departures made up the time and arrived on time, 28% of them. In the other direction, 27 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 PHL.
The worst days
Worst days for AS 442
The latest arrival of the period was on 13 March 2026, 5 hours 26 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 March 2026 | 5 hours 26 minutes | Extreme weather |
| 2 August 2026 | 3 hours 1 minute | Carrier |
| 1 October 2025 | 2 hours 50 minutes | Carrier |
| 11 July 2026 | 2 hours 27 minutes | Carrier |
| 27 August 2026 | 2 hours 21 minutes | National Airspace System |
Delay causes
Why AS 442 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 4,196 reported delay minutes.
- 34%Carrier
- 31%National Airspace System
- 21%Late-arriving aircraft
- 15%Extreme weather
Extreme weather accounts for 15% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.4 times the usual weather exposure. The split is drawn from 4,196 delay minutes reported on AS 442.
Cancellations sit at 1.65% against a national 1.89%, which is ordinary. Diversions add another 1.10%.
Connections and routes
What a delay on this flight costs
5.4% 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 roughly 45 minutes, which a normal layover absorbs.
At 2,379 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.
The same number turns up on one other city pair in the data, including PHL to SEA (28), but none flew often enough under AS 442 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to PHL only.
One caution: this is a thin sample. 364 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 442
For a booking, AS 442 is one of the weaker ways to fly SEA to PHL: 8 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- SEA to PHL, every carrier and departure
- PHL to SEA, the return direction
- Seattle-Tacoma International (SEA) delay statistics
- Philadelphia International (PHL) 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.