Carrier route record
ASSEA→RDM
Alaska Airlines · Seattle to Redmond
- Flights
- 523
- Period
- July 2025 to June 2026
- Share of route
- 27%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Alaska Airlines.
Alaska on SEA to RDM lands a B, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by roughly 45 minutes on average. That is a workable record, not a spotless one. That rests on 523 flights, with a median arrival 5 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate Alaska on SEA to RDM from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
76.5%
Arrivals under 15 minutes late, of 514 completed flights
Avg delay
43 min
Across delayed arrivals only, not all flights
Cancelled
1.53%
National rate is 1.81%
Whole route
83.9%
Every carrier on SEA to RDM, 1,938 flights
These figures cover 523 flights between July 2025 and June 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.
Carrier by carrier
Alaska against every carrier on SEA to RDM
Alaska flew 523 of the 1,938 flights on SEA to RDM, about 27% of it. Its 76.5% on time is 7 points worse than the route as a whole, which runs 83.9%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 86.6% to Alaska at 76.5%.
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 | 1,415 | 86.6% | 52 min | 1.70% | A |
| Alaska Airlines (this page) | 523 | 76.5% | 43 min | 1.53% | B |
Departure window
When Alaska runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 523 flights.
- 5am–8am—
- 8am–11am—
- 11am–2pm209 flights75.5%
- 2pm–5pm2 flights—
- 5pm–8pm—
- 8pm–5am312 flights77.0%
Scale runs 65% to 80%. Rows with fewer than 30 flights show a dash.
The overnight block holds up unusually well at 77.0% on time across 312 flights. Red-eyes fly into empty airspace and empty gates, and they are the first rotation of the aircraft's day rather than the last. The 8pm–5am window is the busiest, with 312 flights scheduled in it.
Across the year
Alaska on SEA to RDM through the year
July is the worst month at 56.7% on time, 30 points below April, the best at 86.7%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. August was the busiest month here, with 62 flights.
Across the week, Tuesday is the strongest day at 85.1% on time and Thursday the weakest at 65.3%. 20 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Alaska runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 47% of the 5,217 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 47%Late-arriving aircraft
- 42%Carrier
- 9%National Airspace System
- 2%Extreme weather
47% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 5,217 reported delay minutes here, that single category outweighs weather by 25 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 5,217 reported delay minutes.
The largest share of delay minutes, 42%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,198 of the 5,217 delay minutes reported here.
Cancellations sit at 1.53% against a national 1.81%, which is ordinary. Diversions add another 0.19%.
Connections and stage length
What a delay here costs
5.3% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 45 minutes, which a normal layover absorbs.
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 8pm–5am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 82.1% on time across 524 flights, 6 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 6 points of difference.
One caution: this is a thin sample. 523 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 SEA to RDM
Put together: treat all of this as provisional. 523 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 76.5% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 514 completed flights over 12 months sit behind that.
Related
Where to go next
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.