Flight number record
AS 646
Alaska Airlines · Dallas-Fort Worth to Portland
- Route
- DFW → PDX
- Departs
- 17:45
- Flights
- 345
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 646, check with Alaska Airlines.
AS 646 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 345 flights, with a median arrival 8 minutes early.
Set against the rest of the country, AS 646's record is 7 points better than the US average of 77.3%. That gap is worth roughly 72 fewer late arrivals for every thousand flights.
Key figures
On time
84.5%
Arrivals under 15 minutes late, of 341 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
0.87%
National rate is 1.89%
1 hour+ late
4.7%
National rate is 8.3%
These figures cover 345 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.
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Schedule
When AS 646 flies
AS 646 flies DFW to PDX without a single fixed slot. Its most common scheduled departure was 17:45, used on 70 of 345 flights, with 17:30 (35 flights) next.
- Departs 17:4570 flights20.3%
- Departs 17:3035 flights10.1%
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 17:45 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and AS 646 runs 17 points better at 84.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
AS 646 next to DFW to PDX
Every carrier on DFW to PDX combined arrived on time 67.4% of the time across 2,328 flights, so AS 646 is 17 points ahead of it. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 646thin sample | 345 | 84.5% | 60 min | 0.87% | B+ |
| All Alaska Airlines on DFW–PDX | 437 | 83.3% | 59 min | 0.92% | B+ |
| All carriers on DFW–PDX | 2,328 | 67.4% | 65 min | 2.15% | C |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 646 quarter by quarter
AS 646 did not run the same all year. Its best quarter was Jul–Sep 2026 at 90.3% on time and its weakest Jul–Sep 2025 at 76.7%, a swing of 14 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.
- Jul–Sep 202530 flights76.7%
- Oct–Dec 202584 flights77.4%
- Jan–Mar 202678 flights89.2%
- Apr–Jun 202691 flights85.7%
- Jul–Sep 202662 flights90.3%
Scale runs 70% to 95%.
By weekday, AS 646 did best on Thursday at 92.2% on time and worst on Sunday at 78.0%. Each day rests on about 49 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 646 runs when it is late
AS 646 often beats the schedule: 107 of 341 completed flights, 31%, arrived 15 minutes or more early. The 53 late arrivals split 20 under half an hour, 17 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early107 flights31.4%
- Within 15 min181 flights53.1%
- 15–29 min late20 flights5.9%
- 30–59 min late17 flights5.0%
- 1–2 hours late9 flights2.6%
- 2+ hours late7 flights2.1%
Scale runs 0% to 100%.
Share of 341 completed flights by arrival against schedule.
A late pushback is often recovered here: of 75 departures that left 15 minutes late or more, 32 still arrived on time. 10 flights left on time and still arrived late.
The worst days
Worst days for AS 646
The latest arrival of the period was on 19 May 2026, 5 hours 45 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 May 2026 | 5 hours 45 minutes | Late-arriving aircraft |
| 3 September 2025 | 3 hours 12 minutes | Late-arriving aircraft |
| 24 October 2025 | 3 hours 6 minutes | Late-arriving aircraft |
| 25 May 2026 | 3 hours | Extreme weather |
| 20 November 2025 | 2 hours 26 minutes | Late-arriving aircraft |
Delay causes
Why AS 646 runs late
Late-arriving aircraft accounts for 67% of the 3,174 delay minutes carriers reported here, and the remaining four split what is left.
- 67%Late-arriving aircraft
- 14%National Airspace System
- 11%Extreme weather
- 8%Carrier
Extreme weather accounts for 11% 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 1.9 times the usual weather exposure. The split is drawn from 3,174 delay minutes reported on AS 646.
Cancellations are rare at 0.87%, 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
Badly late arrivals are rare here: only 4.7% 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 1,616 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 345 flights under AS 646 in the data flew DFW to PDX. 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. 345 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 646
For a booking, read AS 646 as 84.5% on time with 0.87% cancelled over 345 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DFW to PDX, every carrier and departure
- PDX to DFW, the return direction
- Dallas/Fort Worth International (DFW) delay statistics
- Portland International (PDX) 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
- Why the first flight of the morning is statistically safest
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.