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Route Reliability

Seattle → Boise

SEA–BOI · 399 miles · Seattle–Tacoma International Airport to Boise Airport

91
Nerd Approved
WanderNerd Reliability Score
85%
Arrive within 15 minutes
0 min
Average arrival delay
0.4%
Cancelled
5,431
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%2,362 flights
  2. 2.Alaska Airlines82%3,069 flights

What the data says

Morning flights do better here.

SEA–BOI flights departing between 6–9 AM arrived on time 91% of the time, versus 81% between 9 PM–12 AM.

Tuesday comes out ahead.

A small edge: 88% on time on Tuesdays against 82% on Fridays.

Delta Air Lines runs this route best.

Delta Air Lines arrived on time 89% of the time on this route; Alaska Airlines managed 82%.

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
  • Mon86%(801 flights)
  • Tue88%(768 flights)
  • Wed87%(753 flights)
  • Thu83%(789 flights)
  • Fri82%(778 flights)
  • Sat88%(722 flights)
  • Sun82%(798 flights)
On-time by departure window
  • 6–9 AM91%(794 flights)
  • 9 AM–12 PM85%(870 flights)
  • 12–3 PM84%(1071 flights)
  • 3–6 PM85%(1230 flights)
  • 6–9 PM82%(822 flights)
  • 9 PM–12 AM81%(622 flights)
On-time trend by month
86%
May

Jun 78% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202578%496
July 202581%514
August 202579%503
September 202587%480
October 202589%459
November 202587%402
December 202583%434
January 202686%406
February 202689%368
March 202685%446
April 202689%444
May 202686%457

Keep nerding

Based on 5,431 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.