Carrier route record
ASRDM→SEA
Alaska Airlines · Redmond to Seattle
- Flights
- 414
- Period
- September 2025 to August 2026
- Share of route
- 22%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Alaska Airlines.
Alaska on RDM to SEA lands a B, 7 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That rests on 414 flights, with a median arrival 5 minutes early.
Set against the rest of the country, Alaska's RDM to SEA record is 7 points better than the US average of 77.3%. That gap is worth roughly 65 fewer late arrivals for every thousand flights.
Key figures
On time
83.8%
Arrivals under 15 minutes late, of 408 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
1.45%
National rate is 1.89%
Whole route
85.2%
Every carrier on RDM to SEA, 1,867 flights
These figures cover 414 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.
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Carrier by carrier
Alaska against every carrier on RDM to SEA
Alaska flew 414 of the 1,867 flights on RDM to SEA, about 22% of it. Its 83.8% on time is about level with the route as a whole at 85.2%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 85.6% to Alaska at 83.8%.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 1,453 | 85.6% | 58 min | 1.79% | A |
| Alaska Airlines (this page) | 414 | 83.8% | 53 min | 1.45% | B |
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Departure window
When Alaska runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 17 points, against half a point between the best and worst carrier.
- 5am–8am120 flights92.4%
- 8am–11am134 flights82.3%
- 11am–2pm83 flights75.9%
- 2pm–5pm77 flights81.6%
- 5pm–8pm—
- 8pm–5am—
Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 75.9% on time against 92.4% for 5am–8am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 8am–11am window is the busiest, with 134 flights scheduled in it.
Across the year
Alaska on RDM to SEA through the year
December is the weak month at 75.6% on time, against 91.5% in April. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. April was the busiest month here, with 60 flights.
Across the week, Wednesday is the strongest day at 93.1% on time and Sunday the weakest at 78.0%, a spread of 15 points.
Arrival by arrival
How late Alaska on RDM to SEA runs when it is late
The 66 late arrivals split 27 under half an hour, 24 between 30 and 60 minutes, and 15 an hour or more.
- 15+ min early98 flights24.0%
- Within 15 min244 flights59.8%
- 15–29 min late27 flights6.6%
- 30–59 min late24 flights5.9%
- 1–2 hours late9 flights2.2%
- 2+ hours late6 flights1.5%
Scale runs 0% to 100%.
Share of 408 completed flights by arrival against schedule.
16 of 63 late departures made up the time and arrived on time, 25% of them. 19 flights left on time and still arrived late.
The worst days
Worst days for Alaska on RDM to SEA
The latest arrival of the period was on 27 November 2025, 4 hours 40 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 November 2025 | 4 hours 40 minutes | Late-arriving aircraft |
| 4 November 2025 | 4 hours 14 minutes | Carrier |
| 30 September 2025 | 3 hours 55 minutes | Late-arriving aircraft |
| 29 March 2026 | 2 hours 17 minutes | Carrier |
| 15 February 2026 | 2 hours 1 minute | Late-arriving aircraft |
Delay causes
Why Alaska runs late on this route
Carrier accounts for 44% of the 3,492 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 40%Late-arriving aircraft
- 16%National Airspace System
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,492 reported delay minutes here, that single category outweighs weather by 40 to one. The split is drawn from 3,492 reported delay minutes.
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,541 of the 3,492 delay minutes reported here.
Cancellations sit at 1.45% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 3.7% 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 228 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg runs 81.3% on time across 413 flights, within 3 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 414 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 Alaska on RDM to SEA
Put together: treat all of this as provisional. 414 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 83.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 408 completed flights over 12 months sit behind that.
Related
Where to go next
- RDM to SEA, every carrier
- Alaska on SEA to RDM, the return leg
- SkyWest Airlines on RDM to SEA85.6%
- Alaska Airlines network-wide record
- Seattle-Tacoma International (SEA) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.