Route reliability record
SEA→RDM
Seattle to Redmond
- Flights
- 1,865
- Period
- September 2025 to August 2026
- Distance
- 228 mi
- Carriers
- 2
This route 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 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 50 minutes. That rests on 1,865 SEA to RDM flights, of which SkyWest Airlines flew 1,452 at 85.9% on time.
Best time to fly SEA to RDM: a 8am–11am departure, ideally on a Saturday. Flights in that window arrived on time 88.0% of the time and Saturday flights 89.5%, against 84.9% for the route overall.
Set against the rest of the country, this route's record is 8 points better than the US average of 77.3%. That gap is worth roughly 76 fewer late arrivals for every thousand flights.
Key figures
On time
84.9%
Arrivals under 15 minutes late, of 1,829 completed flights
Avg delay
50 min
Across delayed arrivals only, not all flights
Cancelled
1.66%
National rate is 1.89%
Best carrier
SkyWest
85.9% on time across 1,452 flights
These figures cover 1,865 flights between September 2025 and August 2026. The median arrival is 9 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
Which airline is most reliable on SEA to RDM
The two carriers here are closely matched: 5 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 1,452 | 85.9% | 53 min | 1.72% | A |
| Alaska Airlines | 413 | 81.3% | 42 min | 1.45% | B |
No carrier stands out. SkyWest tops the table at 85.9%, 5 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
Flights on SEA to RDM
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Seattle to Redmond
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. SEA → RDMSeattle to Redmond | SkyWest Airlines | 84.4% | 85.9% | 1.72% | 8am–11am, Sat | OO 4047 21:35 |
| 2. SEA → RDMSeattle to Redmond | Alaska Airlines | 80.1% | 81.3% | 1.45% | 8pm–5am, Sat | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
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 1,865 flights.
- 5am–8am—
- 8am–11am335 flights88.0%
- 11am–2pm314 flights83.1%
- 2pm–5pm250 flights82.7%
- 5pm–8pm294 flights85.3%
- 8pm–5am672 flights84.9%
Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.
The early departures do better, though not dramatically: 88.0% on time for the 8am–11am window against 82.7% for 2pm–5pm. Worth taking if the schedule allows, not worth an extra connection. The 8pm–5am window is the busiest, with 672 flights scheduled in it.
Explore
Filter SEA to RDM by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On SEA to RDM, the best departure window is 8am–11am at 88.0% on time and the worst is 2pm–5pm at 82.7%, a real gap of 5.3 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am88.0%
- 11am–2pm83.1%
- 2–5pm82.7%
- 5–8pm85.3%
- 8pm–5am84.9%
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 12 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
August is the worst month at 77.3% on time, 12 points below October, the best at 89.4%. 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. September was the busiest month here, with 210 flights.
Across the week, Saturday is the strongest day at 89.5% on time and Thursday the weakest at 81.0%, a spread of 9 points.
Delay causes
Why this route gets delayed
Carrier accounts for 46% of the 14,000 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Carrier
- 22%Late-arriving aircraft
- 20%Extreme weather
- 12%National Airspace System
Extreme weather accounts for 20% 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 monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 3.2 times the usual weather exposure. The split is drawn from 13,817 reported delay minutes.
The largest share of delay minutes, 46%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 6,418 of the 14,000 delay minutes reported here.
Cancellations sit at 1.66% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 3.3% 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 8am–11am window matters as much as it does.
The return leg runs 85.2% on time across 1,867 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,865 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in RDM after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. October runs 89.4% on time and August 77.3%, a swing of 12 points. If the dates move at all, move them out of August before you think about anything else. 1,829 completed flights over 12 months sit behind that.
Common questions
SEA to RDM questions
How often is SEA to RDM delayed?
About one flight in seven arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 15.1% of the 1,865 flights in this analysis, against 22.7% nationally. Delayed flights are late by about 50 minutes on average.
Which airline is most reliable on SEA to RDM?
SkyWest Airlines leads at 85.9% on time across 1,452 flights. Alaska Airlines is at the other end on 81.3%, a gap of 5 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on SEA to RDM?
The 8am–11am departure window is the strongest at 88.0% on time. The 2pm–5pm window is the weakest at 82.7%, 5 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are August delays on SEA to RDM?
August is the weakest month at 77.3% on time, compared with 89.4% in October. Across the year that is 12 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- RDM to SEA — the return legseparate record
- Seattle-Tacoma International (SEA) delay statistics
- SkyWest Airlines on SEA to RDM85.9%
- Alaska Airlines on SEA to RDM81.3%
- SEA to LAX, a related route82.0%
- SFO to RDM, a related route74.6%
- SEA to PHX, a related route78.2%
- SkyWest Airlines on-time record85.9%
- Alaska Airlines on-time record81.3%
- Worst months to fly in the US, ranked by the data
- Late aircraft, weather, or the airline: what actually causes US flight delays
Direction matters. SEA to RDM and RDM to SEA are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.