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Route Reliability

Boise → Seattle

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

88
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
1 min
Average arrival delay
0.6%
Cancelled
5,436
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 Lines88%2,365 flights
  2. 2.Alaska Airlines78%3,071 flights

What the data says

Morning flights do better here.

BOI–SEA flights departing between 3–6 AM arrived on time 97% of the time, versus 53% between 9 PM–12 AM.

Thursday is the weak spot.

BOI–SEA flights arrived on time 86% of the time on Saturdays. On Thursdays: 78%.

Delta Air Lines runs this route best.

Delta Air Lines arrived on time 88% of the time on this route; Alaska Airlines managed 78%.

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
  • Mon85%(796 flights)
  • Tue86%(768 flights)
  • Wed83%(759 flights)
  • Thu78%(787 flights)
  • Fri80%(773 flights)
  • Sat86%(720 flights)
  • Sun81%(800 flights)
On-time by departure window
  • 3–6 AM97%(361 flights)
  • 6–9 AM90%(1136 flights)
  • 9 AM–12 PM75%(1358 flights)
  • 12–3 PM86%(766 flights)
  • 3–6 PM82%(967 flights)
  • 6–9 PM75%(764 flights)
  • 9 PM–12 AM53%(51 flights)
On-time trend by month
82%
May

Jun 76% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%497
July 202580%512
August 202578%503
September 202582%478
October 202584%456
November 202583%404
December 202581%435
January 202684%403
February 202694%367
March 202688%445
April 202683%444
May 202682%459

Keep nerding

Based on 5,436 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.