Flight number record

AS 442

Alaska Airlines · Seattle to Philadelphia

Route: SEA → PHL
Departs: 09:59
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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, 4 points worse than the national rate of 77.6%. The late ones land roughly 40 minutes behind schedule. That rests on 364 flights, with a median arrival 2 minutes early.

On time

74.1%

Arrivals under 15 minutes late, of 355 completed flights

Avg delay

42 min

Across delayed arrivals only, not all flights

Cancelled

1.65%

National rate is 1.81%

1 hour+ late

3.7%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 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.

Schedule

When AS 442 flies

AS 442 flies SEA to PHL without a single fixed slot. Its most common scheduled departure was 09:59, used on 54 of 364 flights, with 09:42 (50 flights) and 09:39 (44 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 09:5954 flights14.8%
Departs 09:4250 flights13.7%
Departs 09:3944 flights12.1%

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 09:59 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and AS 442 runs 10 points worse at 74.1%. 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 442 next to SEA to PHL

Every carrier on SEA to PHL combined arrived on time 81.7% of the time across 1,326 flights, so AS 442 is 8 points behind it. Alaska flew 656 flights on the same city pair under all its flight numbers, including this one, and those ran 79.5% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight trails by 5 points.

AS 442 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 442thin sample	364	74.1%	42 min	1.65%	C
All Alaska Airlines on SEA–PHL	656	79.5%	46 min	1.37%	B
All carriers on SEA–PHL	1,326	81.7%	61 min	1.66%	B
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	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 2025 at 63.3%, a swing of 17 points on roughly 91 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 flights63.3%
Oct–Dec 202591 flights78.9%
Jan–Mar 202690 flights73.9%
Apr–Jun 202691 flights80.5%

Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, AS 442 did best on Tuesday at 82.7% on time and worst on Monday at 62.7%. Each day rests on about 52 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

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 3,854 reported delay minutes.

National Airspace System
29%
Late-arriving aircraft
28%
Carrier
26%
Extreme weather
17%

Extreme weather accounts for 17% 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 2.7 times the usual weather exposure. The split is drawn from 3,854 delay minutes reported on AS 442.

Cancellations sit at 1.65% against a national 1.81%, which is ordinary. Diversions add another 0.82%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 3.7% 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.

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.

Where to go next

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.

Key figures