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Route Reliability

Miami → Seattle

MIA–SEA · 2,724 miles · Miami International Airport to Seattle–Tacoma International Airport

63
A Little Dicey
WanderNerd Reliability Score
66%
Arrive within 15 minutes
18 min
Average arrival delay
1.2%
Cancelled
1,150
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.American Airlines68%393 flights
  2. 2.Alaska Airlines66%392 flights
  3. 3.Delta Air Lines62%365 flights

What the data says

Morning-you made the right choice.

MIA–SEA flights departing between 6–9 AM arrived on time 74% of the time, versus 54% between 3–6 PM.

Sunday scaries are real for this one.

MIA–SEA flights arrived on time 74% of the time on Tuesdays. On Sundays: 60%.

American Airlines has a slight edge here.

American Airlines arrived on time 68% of the time on this route; Delta Air Lines managed 62%.

Recent months have been rougher.

MIA–SEA flights arrived on time 58% of the time over the last three months in the data, compared with 68% in the three months before that.

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
  • Mon63%(159 flights)
  • Tue74%(160 flights)
  • Wed72%(158 flights)
  • Thu64%(162 flights)
  • Fri62%(161 flights)
  • Sat66%(165 flights)
  • Sun60%(166 flights)
On-time by departure window
  • 6–9 AM74%(58 flights)
  • 3–6 PM54%(143 flights)
  • 6–9 PM67%(930 flights)
On-time trend by month
67%
May

Jun 71% → May 67% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%90
July 202566%91
August 202554%91
September 202566%90
October 202578%92
November 202571%94
December 202570%118
January 202663%101
February 202670%84
March 202647%88
April 202662%89
May 202667%103

Same trip, other airports

Keep nerding

Based on 1,150 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.