Flight number record
AS 424
Alaska Airlines · Seattle to Dallas-Fort Worth
- Route
- SEA → DFW
- Departs
- 17:56
- Flights
- 320
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 424, check with Alaska Airlines.
AS 424 lands a B+, 2 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 roughly 40 minutes on average. That rests on 320 flights, with a median arrival 5 minutes early.
Key figures
On time
78.9%
Arrivals under 15 minutes late, of 318 completed flights
Avg delay
41 min
Across delayed arrivals only, not all flights
Cancelled
0.62%
National rate is 1.89%
1 hour+ late
3.1%
National rate is 8.3%
These figures cover 320 flights between September 2025 and August 2026. The median arrival is 5 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 424 flies
AS 424 flies SEA to DFW without a single fixed slot. Its most common scheduled departure was 17:56, used on 101 of 320 flights, with 17:58 (57 flights) and 18:02 (41 flights) next.
- Departs 17:56101 flights31.6%
- Departs 17:5857 flights17.8%
- Departs 18:0241 flights12.8%
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 17:56 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and AS 424 runs 11 points better at 78.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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 424 next to SEA to DFW
Every carrier on SEA to DFW combined arrived on time 78.0% of the time across 5,228 flights, so AS 424 is about level with it. Alaska flew 1,758 flights on the same city pair under all its flight numbers, including this one, and those ran 80.8% 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 424thin sample | 320 | 78.9% | 41 min | 0.62% | B+ |
| All Alaska Airlines on SEA–DFW | 1,758 | 80.8% | 43 min | 0.85% | B+ |
| All carriers on SEA–DFW | 5,228 | 78.0% | 75 min | 1.66% | B |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 424 quarter by quarter
AS 424 did not run the same all year. Its best quarter was Oct–Dec 2025 at 86.4% on time and its weakest Jul–Sep 2026 at 68.1%, a swing of 18 points on roughly 64 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 flights70.0%
- Oct–Dec 202589 flights86.4%
- Jan–Mar 202684 flights84.3%
- Apr–Jun 202670 flights74.3%
- Jul–Sep 202647 flights68.1%
Scale runs 60% to 90%.
By weekday, AS 424 did best on Tuesday at 89.4% on time and worst on Friday at 68.9%. Each day rests on about 46 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 424 runs when it is late
AS 424 often beats the schedule: 100 of 318 completed flights, 31%, arrived 15 minutes or more early. The 67 late arrivals split 30 under half an hour, 27 between 30 and 60 minutes, and 10 an hour or more.
- 15+ min early100 flights31.4%
- Within 15 min151 flights47.5%
- 15–29 min late30 flights9.4%
- 30–59 min late27 flights8.5%
- 1–2 hours late8 flights2.5%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 318 completed flights by arrival against schedule.
A late pushback is often recovered here: of 92 departures that left 15 minutes late or more, 38 still arrived on time. 13 flights left on time and still arrived late.
The worst days
Worst days for AS 424
The latest arrival of the period was on 13 March 2026, 4 hours 3 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across March, December, July and January, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 March 2026 | 4 hours 3 minutes | Extreme weather |
| 10 December 2025 | 2 hours 18 minutes | Carrier |
| 18 December 2025 | 1 hour 52 minutes | Late-arriving aircraft |
| 22 July 2026 | 1 hour 49 minutes | Carrier |
| 26 January 2026 | 1 hour 43 minutes | National Airspace System |
Delay causes
Why AS 424 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 2,760 reported delay minutes.
- 37%Carrier
- 34%Late-arriving aircraft
- 20%National Airspace System
- 10%Extreme weather
The largest share of delay minutes, 37%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,022 of the 2,760 delay minutes reported here. The split is drawn from 2,760 delay minutes reported on AS 424.
Cancellations are rare at 0.62%, 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 3.1% 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 1,660 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 three other city pairs in the data, including SFO to SAN (13), PSP to SFO (2) and SFO to PSP (2), but none flew often enough under AS 424 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to DFW only.
One caution: this is a thin sample. 320 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 424
For a booking, read AS 424 as 78.9% on time with 0.62% cancelled over 320 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to DFW, every carrier and departure
- DFW to SEA, the return direction
- American Airlines 2748 on the same route94.0%
- Delta Air Lines 870 on the same route74.0%
- American Airlines 767 on the same route67.6%
- American Airlines 1667 on the same route88.4%
- American Airlines 707 on the same route76.8%
- Alaska Airlines 414 on the same route90.9%
- Seattle-Tacoma International (SEA) delay statistics
- Dallas/Fort Worth International (DFW) 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.