Route reliability record
SEA→PSC
Seattle to Pasco
- Flights
- 1,678
- Period
- September 2025 to August 2026
- Distance
- 172 mi
- Carriers
- 2
This route lands a B+, 6 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 about an hour on average. That rests on 1,678 SEA to PSC flights, with a median arrival 7 minutes early.
Best time to fly SEA to PSC: a 8am–11am departure, ideally on a Tuesday. Flights in that window arrived on time 87.8% of the time and Tuesday flights 87.6%, against 83.3% for the route overall.
Set against the rest of the country, this route's record is 6 points better than the US average of 77.3%. That gap is worth roughly 60 fewer late arrivals for every thousand flights.
Key figures
On time
83.3%
Arrivals under 15 minutes late, of 1,660 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
0.95%
National rate is 1.89%
Best carrier
SkyWest
83.8% on time across 1,465 flights
These figures cover 1,678 flights between September 2025 and August 2026. The median arrival is 7 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 PSC
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 | 1,465 | 83.8% | 65 min | 0.75% | B+ |
| Alaska Airlinesthin sample | 213 | 79.3% | 38 min | 2.35% | B |
Flight by flight
Flights on SEA to PSC
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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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 1,678 flights.
- 5am–8am—
- 8am–11am394 flights87.8%
- 11am–2pm255 flights79.8%
- 2pm–5pm360 flights85.5%
- 5pm–8pm58 flights78.9%
- 8pm–5am611 flights80.8%
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 87.8% of the time, against 78.9% for the evening 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 8pm–5am window is the busiest, with 611 flights scheduled in it.
Explore
Filter SEA to PSC 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 PSC, the best departure window is 8am–11am at 87.8% on time and the worst is 5pm–8pm at 78.9%, a real gap of 8.9 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am87.8%
- 11am–2pm79.8%
- 2–5pm85.5%
- 5–8pm78.9%
- 8pm–5am80.8%
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 13 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.
July is the worst month at 74.2% on time, 13 points below June, the best at 87.6%. 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. October was the busiest month here, with 213 flights.
Across the week, Tuesday is the strongest day at 87.6% on time and Thursday the weakest at 80.1%, a spread of 8 points.
Delay causes
Why this route gets delayed
Carrier accounts for 54% of the 17,000 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Carrier
- 23%Extreme weather
- 15%Late-arriving aircraft
- 8%National Airspace System
Extreme weather accounts for 23% 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 3.8 times the usual weather exposure. The split is drawn from 16,939 reported delay minutes.
The largest share of delay minutes, 54%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 9,127 of the 17,000 delay minutes reported here.
Cancellations sit at 0.95% against a national 1.89%, which is ordinary. Diversions add another 0.12%.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 4.4% 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 172 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 is a different operation and performs like one: it runs 88.6% on time across 1,679 flights, 5 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 5 points of difference.
The sample behind these figures is 1,678 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 PSC 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. June runs 87.6% on time and July 74.2%, a swing of 13 points. If the dates move at all, move them out of July before you think about anything else. 1,660 completed flights over 12 months sit behind that.
Common questions
SEA to PSC questions
How often is SEA to PSC delayed?
About one flight in six arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 16.7% of the 1,678 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is SEA to PSC compared with the rest of the country?
83.3% of flights arrive on time here against a national 77.3%, a difference of 6 points in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on SEA to PSC?
The 8am–11am departure window is the strongest at 87.8% on time. The 5pm–8pm window is the weakest at 78.9%, 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 July delays on SEA to PSC?
July is the weakest month at 74.2% on time, compared with 87.6% in June. Across the year that is 13 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
- PSC to SEA — the return legseparate record
- Seattle-Tacoma International (SEA) delay statistics
- SkyWest Airlines on SEA to PSC83.8%
- Alaska Airlines on SEA to PSC79.3%
- SEA to LAX, a related route82.0%
- SLC to PSC, a related route89.3%
- SEA to PHX, a related route78.2%
- SkyWest Airlines on-time record83.8%
- Alaska Airlines on-time record79.3%
- 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. SEA to PSC and PSC 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.