Route reliability record
RDM→SEA
Redmond to Seattle
- Flights
- 1,867
- Period
- September 2025 to August 2026
- Distance
- 228 mi
- Carriers
- 2
This route earns an A. 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 an hour. That rests on 1,867 RDM to SEA flights, of which SkyWest Airlines flew 1,453 at 85.6% on time.
Best time to fly RDM to SEA: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 89.3% of the time and Saturday flights 90.0%, against 85.2% 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 79 fewer late arrivals for every thousand flights.
Key figures
On time
85.2%
Arrivals under 15 minutes late, of 1,834 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
1.71%
National rate is 1.89%
Best carrier
SkyWest
85.6% on time across 1,453 flights
These figures cover 1,867 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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Carrier by carrier
Which airline is most reliable on RDM to SEA
The two carriers here are closely matched: 2 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 | 1,453 | 85.6% | 58 min | 1.79% | A |
| Alaska Airlines | 414 | 83.8% | 53 min | 1.45% | B |
No carrier stands out. SkyWest tops the table at 85.6%, 2 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
Flights on RDM to SEA
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 Redmond to Seattle
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. RDM → SEARedmond to Seattle | SkyWest Airlines | 84.1% | 85.6% | 1.79% | 5am–8am, Sat | OO 4036 07:00 |
| 2. RDM → SEARedmond to Seattle | Alaska Airlines | 82.6% | 83.8% | 1.45% | 5am–8am, Wed | — |
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 1,867 flights.
- 5am–8am555 flights89.3%
- 8am–11am162 flights81.3%
- 11am–2pm477 flights85.0%
- 2pm–5pm192 flights80.1%
- 5pm–8pm481 flights83.9%
- 8pm–5am—
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.3% of the time, against 80.1% for the afternoon window. That is 9 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 555 flights scheduled in it.
Explore
Filter RDM to SEA 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 RDM to SEA, the best departure window is 5am–8am at 89.3% on time and the worst is 2pm–5pm at 80.1%, a real gap of 9.2 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am89.3%
- 8–11am81.3%
- 11am–2pm85.0%
- 2–5pm80.1%
- 5–8pm83.9%
- 8pm–5am—
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
Twelve months, one bar each, drawn from the same 1,867 flights. The strip shows how much of this route's record is set by the calendar rather than by the operation.
August is the worst month at 78.1% on time, 11 points below November, the best at 89.1%. 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 90.0% on time and Thursday the weakest at 81.8%, a spread of 8 points.
Delay causes
Why this route gets delayed
Carrier accounts for 44% of the 15,000 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 23%Late-arriving aircraft
- 17%Extreme weather
- 16%National Airspace System
- 0%Security
Extreme weather accounts for 17% 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 2.8 times the usual weather exposure. The split is drawn from 15,419 reported delay minutes.
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 6,737 of the 15,000 delay minutes reported here.
Cancellations sit at 1.71% against a national 1.89%, which is ordinary. Diversions add another 0.05%.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 4.1% 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 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 84.9% on time across 1,865 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 1,867 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 SEA after this flight
What to do with this
Booking this route
Put together: take the 5am–8am departure, avoid August if the dates are flexible, and if two carriers are within a few dollars of each other, SkyWest is the one with the record behind it. None of that guarantees an on-time arrival; it moves the odds by 9 points, which is the most any booking decision can do. 1,834 completed flights over 12 months sit behind that.
Common questions
RDM to SEA questions
How often is RDM to SEA 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 14.8% of the 1,867 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on RDM to SEA?
SkyWest Airlines leads at 85.6% on time across 1,453 flights. Alaska Airlines is at the other end on 83.8%, a gap of 2 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 RDM to SEA?
The 5am–8am departure window is the strongest at 89.3% on time. The 2pm–5pm window is the weakest at 80.1%, 9 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 RDM to SEA?
August is the weakest month at 78.1% on time, compared with 89.1% in November. Across the year that is 11 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
- SEA to RDM — the return legseparate record
- Seattle-Tacoma International (SEA) delay statistics
- SkyWest Airlines on RDM to SEA85.6%
- Alaska Airlines on RDM to SEA83.8%
- RDM to SFO, a related route61.8%
- LAX to SEA, a related route85.0%
- RDM to PHX, a related route91.0%
- SkyWest Airlines on-time record85.6%
- Alaska Airlines on-time record83.8%
- The best time of day to fly, according to 7.05 million flight records
- Worst months to fly in the US, ranked by the data
Direction matters. RDM to SEA and SEA to RDM 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.