Carrier route record
OOSEA→PHX
SkyWest Airlines · Seattle to Phoenix
- 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 SEA to PHX lands a B+, about a point better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 409 flights. The strongest carrier on the route with a full sample, Envoy Air, flew 760 at 85.3% on time.
Envoy Air is the most reliable of the four carriers covered here at 85.3% on time across 760 flights.
Key figures
On time
78.5%
Arrivals under 15 minutes late, of 405 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
0.49%
National rate is 1.89%
Whole route
78.2%
Every carrier on SEA to PHX, 7,205 flights
These figures cover 409 flights between September 2025 and August 2026. The median arrival is 5 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 SEA to PHX
SkyWest flew 409 of the 7,205 flights on SEA to PHX, about 6% of it. Its 78.5% on time is about level with the route as a whole at 78.2%. Ranked by on-time rate it is number five of seven carriers on the route, where the range runs from Envoy at 85.3% to Southwest at 65.1%. 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 85.3% of the time; Southwest Airlines manages 65.1%. Sample sizes sit next to every figure, because a two-point gap across 1,042 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Air | 760 | 85.3% | 74 min | 0.00% | A+ |
| American Airlinesthin sample | 221 | 83.2% | 76 min | 0.45% | B+ |
| Delta Air Lines | 1,768 | 80.9% | 67 min | 0.96% | B+ |
| Alaska Airlines | 2,889 | 79.2% | 45 min | 0.66% | B+ |
| SkyWest Airlines (this page) | 409 | 78.5% | 80 min | 0.49% | B+ |
| Frontier Airlinesthin sample | 116 | 74.5% | 146 min | 5.17% | C− |
| Southwest Airlines | 1,042 | 65.1% | 49 min | 0.77% | C+ |
The spread between Envoy and Southwest is 20 points, wide enough that it should decide the booking. On a hundred trips that is 20 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 13 points, against 20 points between the best and worst carrier.
- 5am–8am107 flights84.8%
- 8am–11am35 flights85.7%
- 11am–2pm153 flights76.3%
- 2pm–5pm45 flights75.0%
- 5pm–8pm69 flights72.5%
- 8pm–5am—
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 85.7% of the time, against 72.5% for the evening window. That is 13 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 153 flights scheduled in it.
Across the year
SkyWest on SEA to PHX through the year
- Jul–Sep 202558 flights84.2%
- Oct–Dec 2025163 flights75.2%
- Jan–Mar 2026153 flights82.2%
- Apr–Jun 202634 flights70.6%
- Jul–Sep 20261 flights—
Scale runs 60% to 90%. 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 78.5% on time across 409 flights.
SkyWest on SEA to PHX did not run the same all year. Its best quarter was Jul–Sep 2025 at 84.2% on time and its weakest Apr–Jun 2026 at 70.6%, a swing of 14 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, Friday is the strongest day at 84.7% on time and Monday the weakest at 72.7%, a spread of 12 points.
Arrival by arrival
How late SkyWest on SEA to PHX runs when it is late
SkyWest on SEA to PHX often beats the schedule: 119 of 405 completed flights, 29%, arrived 15 minutes or more early. The 87 late arrivals split 37 under half an hour, 23 between 30 and 60 minutes, and 27 an hour or more.
- 15+ min early119 flights29.4%
- Within 15 min199 flights49.1%
- 15–29 min late37 flights9.1%
- 30–59 min late23 flights5.7%
- 1–2 hours late11 flights2.7%
- 2+ hours late16 flights4.0%
Scale runs 0% to 100%.
Share of 405 completed flights by arrival against schedule.
14 of 77 late departures made up the time and arrived on time, 18% of them. In the other direction, 24 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 PHX.
The worst days
Worst days for SkyWest on SEA to PHX
The latest arrival of the period was on 11 February 2026, 19 hours 42 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 February 2026 | 19 hours 42 minutes | Carrier |
| 1 December 2025 | 7 hours 50 minutes | Carrier |
| 26 September 2025 | 4 hours 46 minutes | Carrier |
| 14 September 2025 | 3 hours 40 minutes | Late-arriving aircraft |
| 14 December 2025 | 3 hours 26 minutes | Carrier |
Delay causes
Why SkyWest runs late on this route
Carrier accounts for 70% of the 6,920 delay minutes carriers reported here, and the remaining four split what is left.
- 70%Carrier
- 15%Late-arriving aircraft
- 11%National Airspace System
- 4%Extreme weather
The largest share of delay minutes, 70%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,830 of the 6,920 delay minutes reported here. The split is drawn from 6,920 reported delay minutes.
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
6.7% 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 a little over 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 83.0% on time across 409 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.
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 SEA to PHX
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 78.5% 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
- SEA to PHX, every carrier
- SkyWest on PHX to SEA, the return leg
- Envoy Air on SEA to PHX85.3%
- American Airlines on SEA to PHX83.2%
- Delta Air Lines on SEA to PHX80.9%
- Alaska Airlines on SEA to PHX79.2%
- Frontier Airlines on SEA to PHX74.5%
- Southwest Airlines on SEA to PHX65.1%
- SkyWest Airlines network-wide record
- Seattle-Tacoma International (SEA) delay statistics
- Phoenix Sky Harbor International (PHX) 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.