Flight number record

AS 640

Alaska Airlines · Tampa to Seattle

Route: TPA → SEA
Departs: 07:00
Flights: 277
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s AS 640, check with Alaska Airlines.

AS 640 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 77.3%. The late ones land roughly 40 minutes behind schedule. That rests on 277 flights, with a median arrival 2 minutes late.

The national on-time rate over the same period is 77.3%, so AS 640 runs 4 points behind the country as a whole. Across a thousand flights that is about 40 extra late arrivals.

On time

73.3%

Arrivals under 15 minutes late, of 273 completed flights

Avg delay

41 min

Across delayed arrivals only, not all flights

Cancelled

0.36%

National rate is 1.89%

1 hour+ late

5.9%

National rate is 8.3%

These figures cover 277 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.

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Schedule

When AS 640 flies

AS 640 flies TPA to SEA without a single fixed slot. Its most common scheduled departure was 07:00, used on 133 of 277 flights, with 07:08 (69 flights) and 07:05 (33 flights) next.

Departs 07:00133 flights48.0%
Departs 07:0869 flights24.9%
Departs 07:0533 flights11.9%

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 640 runs 16 points worse at 73.3%. 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 640 next to TPA to SEA

Every carrier on TPA to SEA combined arrived on time 74.2% of the time across 975 flights, so AS 640 is about level with it. Alaska flew 612 flights on the same city pair under all its flight numbers, including this one, and those ran 68.3% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 6 points.

AS 640 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 640thin sample	277	73.3%	41 min	0.36%	C+
All Alaska Airlines on TPA–SEA	612	68.3%	52 min	0.98%	C+
All carriers on TPA–SEA	975	74.2%	49 min	0.92%	C+
Alaska Airlines, whole network	309,844	79.7%	52 min	1.20%	B

Across the year

AS 640 quarter by quarter

AS 640 did not run the same all year. Its best quarter was Apr–Jun 2026 at 80.7% on time and its weakest Oct–Dec 2025 at 63.2%, a swing of 18 points on roughly 69 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.

Oct–Dec 202539 flights63.2%
Jan–Mar 202688 flights65.1%
Apr–Jun 202688 flights80.7%
Jul–Sep 202662 flights80.3%

Scale runs 55% to 85%.

By weekday, AS 640 did best on Saturday at 80.6% on time and worst on Thursday at 59.0%. Each day rests on about 40 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late AS 640 runs when it is late

The 73 late arrivals split 33 under half an hour, 24 between 30 and 60 minutes, and 16 an hour or more. Not one arrived two hours late.

15+ min early54 flights19.8%
Within 15 min146 flights53.5%
15–29 min late33 flights12.1%
30–59 min late24 flights8.8%
1–2 hours late16 flights5.9%
2+ hours late0 flights0.0%

Scale runs 0% to 100%.

Share of 273 completed flights by arrival against schedule.

13 of 50 late departures made up the time and arrived on time, 26% of them. In the other direction, 36 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 640

The latest arrival of the period was on 29 January 2026, 1 hour 54 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across January, August, July, December and April, with no single month standing out.

The latest arrivals of AS 640 in the period
Date	Arrived late by	Largest filed cause
29 January 2026	1 hour 54 minutes	Extreme weather
6 August 2026	1 hour 44 minutes	Late-arriving aircraft
9 July 2026	1 hour 39 minutes	Late-arriving aircraft
31 December 2025	1 hour 34 minutes	Carrier
17 April 2026	1 hour 32 minutes	Carrier

Delay causes

Why AS 640 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 3,005 reported delay minutes.

National Airspace System
39%
Carrier
28%
Late-arriving aircraft
26%
Extreme weather
6%
Security
0%

39% 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 1,174 minutes out of 3,005, against a national NAS share of 21%. The split is drawn from 3,005 delay minutes reported on AS 640.

Cancellations are rare at 0.36%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

5.9% 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 40 minutes, which a normal layover absorbs.

At 2,520 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 277 flights under AS 640 in the data flew TPA 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. 277 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 640

For a booking, read AS 640 as 73.3% on time with 0.36% cancelled over 277 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures