Route reliability record
PSC→SEA
Pasco to Seattle
- Flights
- 1,679
- Period
- September 2025 to August 2026
- Distance
- 172 mi
- Carriers
- 2
This route earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 1,679 PSC to SEA flights, with a median arrival 11 minutes early.
Best time to fly PSC to SEA: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 91.4% of the time and Tuesday flights 91.1%, against 88.6% for the route overall.
Set against the rest of the country, this route's record is 11 points better than the US average of 77.3%. That gap is worth roughly 113 fewer late arrivals for every thousand flights.
Key figures
On time
88.6%
Arrivals under 15 minutes late, of 1,666 completed flights
Avg delay
89 min
Across delayed arrivals only, not all flights
Cancelled
0.77%
National rate is 1.89%
Best carrier
SkyWest
89.0% on time across 1,465 flights
These figures cover 1,679 flights between September 2025 and August 2026. The median arrival is 11 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 PSC to SEA
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 | 89.0% | 88 min | 0.75% | A+ |
| Alaska Airlinesthin sample | 214 | 85.8% | 93 min | 0.93% | A+ |
Flight by flight
Flights on PSC 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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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 1,679 flights.
- 5am–8am465 flights91.4%
- 8am–11am206 flights86.3%
- 11am–2pm466 flights87.6%
- 2pm–5pm182 flights87.9%
- 5pm–8pm341 flights88.2%
- 8pm–5am19 flights—
Scale runs 80% to 95%. Rows with fewer than 30 flights show a dash.
The early departures do better, though not dramatically: 91.4% on time for the 5am–8am window against 86.3% for 8am–11am. Worth taking if the schedule allows, not worth an extra connection. The 11am–2pm window is the busiest, with 466 flights scheduled in it.
Explore
Filter PSC 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 PSC to SEA, the best departure window is 5am–8am at 91.4% on time and the worst is 8am–11am at 86.3%, a real gap of 5.1 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am91.4%
- 8–11am86.3%
- 11am–2pm87.6%
- 2–5pm87.9%
- 5–8pm88.2%
- 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 1,679 flights. The strip shows how much of this route's record is set by the calendar rather than by the operation.
Delays peak in April, when the on-time rate falls to 86.2%. March is the strongest month at 92.4%. Moving a flexible trip across that boundary buys 6 points. October was the busiest month here, with 213 flights.
Across the week, Tuesday is the strongest day at 91.1% on time and Friday the weakest at 86.1%, a spread of 5 points.
Delay causes
Why this route gets delayed
Carrier accounts for 57% of the 17,000 delay minutes carriers reported here, and the remaining four split what is left.
- 57%Carrier
- 18%Extreme weather
- 17%Late-arriving aircraft
- 8%National Airspace System
Extreme weather accounts for 18% 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 3.0 times the usual weather exposure. The split is drawn from 16,936 reported delay minutes.
The largest share of delay minutes, 57%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 9,632 of the 17,000 delay minutes reported here.
Cancellations are rare at 0.77%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 4.2% 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 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 83.3% on time across 1,678 flights, 5 points below 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 1,679 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: this route's record is 88.6% on time with 0.77% cancelled, worth an A+. The largest single lever is the 5am–8am departure window, and the numbers below the table are where the reasoning behind that lives. 1,666 completed flights over 12 months sit behind that.
Common questions
PSC to SEA questions
How often is PSC to SEA delayed?
About one flight in nine arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 11.4% of the 1,679 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
How reliable is PSC to SEA compared with the rest of the country?
88.6% of flights arrive on time here against a national 77.3%, a difference of 11 points in its favour. That is worth a A+ on this site's grading scale.
What time of day has the fewest delays on PSC to SEA?
The 5am–8am departure window is the strongest at 91.4% on time. The 8am–11am window is the weakest at 86.3%, 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 April delays on PSC to SEA?
April is the weakest month at 86.2% on time, compared with 92.4% in March. Across the year that is 6 points between the best and worst months. The seasonal swing is modest enough that it should not decide when you travel.
Related
Where to go next
- SEA to PSC — the return legseparate record
- Seattle-Tacoma International (SEA) delay statistics
- SkyWest Airlines on PSC to SEA89.0%
- Alaska Airlines on PSC to SEA85.8%
- PSC to SLC, a related route93.5%
- LAX to SEA, a related route85.0%
- PSC to DEN, a related route89.1%
- SkyWest Airlines on-time record89.0%
- Alaska Airlines on-time record85.8%
- The most punctual routes in the US, and the least
- Does flight distance affect delays? Less than it affects cancellations
Direction matters. PSC to SEA and SEA to PSC 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.