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Route Reliability

Phoenix → Seattle

PHX–SEA · 1,107 miles · Phoenix Sky Harbor International Airport to Seattle–Tacoma International Airport

88
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
0 min
Average arrival delay
0.6%
Cancelled
7,317
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.Delta Air Lines89%1,764 flights
  2. 2.American Airlines85%1,400 flights
  3. 3.Frontier Airlines85%191 flights
  4. 4.Alaska Airlines85%2,926 flights
  5. 5.Southwest Airlines68%1,036 flights

What the data says

Morning flights do better here.

PHX–SEA flights departing between 3–6 AM arrived on time 97% of the time, versus 67% between 9 PM–12 AM.

Tuesday comes out ahead.

A small edge: 86% on time on Tuesdays against 80% on Fridays.

Delta Air Lines has a clear lead on this route.

Delta Air Lines arrived on time 89% of the time on this route; Southwest Airlines managed 68%.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon83%(1081 flights)
  • Tue86%(994 flights)
  • Wed85%(1010 flights)
  • Thu82%(1065 flights)
  • Fri80%(1053 flights)
  • Sat85%(991 flights)
  • Sun84%(1065 flights)
On-time by departure window
  • 12–3 AM—(1 flights)
  • 3–6 AM97%(128 flights)
  • 6–9 AM88%(1838 flights)
  • 9 AM–12 PM86%(1364 flights)
  • 12–3 PM85%(1364 flights)
  • 3–6 PM79%(1493 flights)
  • 6–9 PM80%(835 flights)
  • 9 PM–12 AM67%(236 flights)
On-time trend by month
87%
May

Jun 78% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202578%616
July 202583%618
August 202582%581
September 202585%539
October 202581%596
November 202582%588
December 202579%622
January 202686%580
February 202691%566
March 202682%667
April 202688%665
May 202687%621

Same trip, other airports

Keep nerding

Based on 7,317 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.