Carrier route record
OOPHX→SEA
SkyWest Airlines · Phoenix to Seattle
- Flights
- 409
- Period
- September 2025 to August 2026
- Share of route
- 6%
- Carriers
- 7
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on PHX to SEA 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 409 flights. The strongest carrier on the route with a full sample, Envoy Air, flew 761 at 87.6% on time.
Envoy Air is the most reliable of the four carriers covered here at 87.6% on time across 761 flights.
Key figures
On time
83.0%
Arrivals under 15 minutes late, of 405 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
0.49%
National rate is 1.89%
Whole route
82.2%
Every carrier on PHX to SEA, 7,202 flights
These figures cover 409 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
SkyWest against every carrier on PHX to SEA
SkyWest flew 409 of the 7,202 flights on PHX to SEA, about 6% of it. Its 83.0% on time is about level with the route as a whole at 82.2%. Ranked by on-time rate it is number five of seven carriers on the route, where the range runs from Envoy at 87.6% to Southwest at 62.2%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. Envoy Air arrives on time 87.6% of the time; Southwest Airlines manages 62.2%. Sample sizes sit next to every figure, because a two-point gap across 1,039 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Air | 761 | 87.6% | 50 min | 0.00% | A+ |
| Delta Air Lines | 1,767 | 87.5% | 75 min | 0.96% | A+ |
| Alaska Airlines | 2,886 | 84.4% | 56 min | 0.76% | B+ |
| Frontier Airlinesthin sample | 116 | 83.6% | 83 min | 0.00% | B+ |
| SkyWest Airlines (this page) | 409 | 83.0% | 63 min | 0.49% | B+ |
| American Airlinesthin sample | 224 | 82.5% | 63 min | 0.45% | B+ |
| Southwest Airlines | 1,039 | 62.2% | 45 min | 0.77% | D+ |
The spread between Envoy and Southwest is 25 points, wide enough that it should decide the booking. On a hundred trips that is 25 more arrivals inside the on-time window.
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Departure window
When SkyWest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 15 points, against 25 points between the best and worst carrier.
- 5am–8am66 flights92.3%
- 8am–11am126 flights83.2%
- 11am–2pm45 flights86.0%
- 2pm–5pm68 flights80.9%
- 5pm–8pm103 flights77.7%
- 8pm–5am1 flights—
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 92.3% of the time, against 77.7% for the evening window. That is 15 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 126 flights scheduled in it.
Across the year
SkyWest on PHX to SEA through the year
- Jul–Sep 202558 flights87.5%
- Oct–Dec 2025163 flights76.5%
- Jan–Mar 2026153 flights89.5%
- Apr–Jun 202634 flights79.4%
- Jul–Sep 20261 flights—
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 83.0% on time across 409 flights.
SkyWest on PHX to SEA did not run the same all year. Its best quarter was Jan–Mar 2026 at 89.5% on time and its weakest Oct–Dec 2025 at 76.5%, a swing of 13 points on roughly 102 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
Across the week, Saturday is the strongest day at 91.8% on time and Friday the weakest at 78.0%, a spread of 14 points.
Arrival by arrival
How late SkyWest on PHX to SEA runs when it is late
SkyWest on PHX to SEA often beats the schedule: 137 of 405 completed flights, 34%, arrived 15 minutes or more early. The 69 late arrivals split 24 under half an hour, 22 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early137 flights33.8%
- Within 15 min199 flights49.1%
- 15–29 min late24 flights5.9%
- 30–59 min late22 flights5.4%
- 1–2 hours late13 flights3.2%
- 2+ hours late10 flights2.5%
Scale runs 0% to 100%.
Share of 405 completed flights by arrival against schedule.
11 of 57 late departures made up the time and arrived on time, 19% of them. In the other direction, 23 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SEA.
The worst days
Worst days for SkyWest on PHX to SEA
The latest arrival of the period was on 26 September 2025, 4 hours 31 minutes behind schedule; most of its delay minutes were filed as extreme weather. Three of the five worst days fell in November 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 September 2025 | 4 hours 31 minutes | Extreme weather |
| 19 November 2025 | 3 hours 21 minutes | Carrier |
| 18 November 2025 | 3 hours 13 minutes | Carrier |
| 5 November 2025 | 3 hours | Carrier |
| 27 January 2026 | 2 hours 59 minutes | Carrier |
Delay causes
Why SkyWest runs late on this route
Carrier accounts for 68% of the 4,354 delay minutes carriers reported here, and the remaining four split what is left.
- 68%Carrier
- 11%Extreme weather
- 10%National Airspace System
- 10%Late-arriving aircraft
- 0%Security
Extreme weather accounts for 11% 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 1.9 times the usual weather exposure. The split is drawn from 4,354 reported delay minutes.
The largest share of delay minutes, 68%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,963 of the 4,354 delay minutes reported here.
Cancellations are rare at 0.49%, 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 costs
5.7% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 1,107 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg is a different operation and performs like one: it runs 78.5% on time across 409 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.
One caution: this is a thin sample. 409 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 SkyWest on PHX to SEA
Put together: treat all of this as provisional. 409 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 83.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 405 completed flights over 12 months sit behind that.
Related
Where to go next
- PHX to SEA, every carrier
- SkyWest on SEA to PHX, the return leg
- Envoy Air on PHX to SEA87.6%
- Delta Air Lines on PHX to SEA87.5%
- Alaska Airlines on PHX to SEA84.4%
- Frontier Airlines on PHX to SEA83.6%
- American Airlines on PHX to SEA82.5%
- Southwest Airlines on PHX to SEA62.2%
- SkyWest Airlines network-wide record
- Phoenix Sky Harbor International (PHX) delay statistics
- Seattle-Tacoma International (SEA) delay statistics
- Same route, different airline: where the carrier you pick matters most
- The best time of day to fly, according to 7.05 million flight records
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.