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Route Reliability

BIL → Seattle

BIL–SEA · 664 miles · BIL Airport to Seattle–Tacoma International Airport

89
Pretty Reliable
WanderNerd Reliability Score
86%
Arrive within 15 minutes
0 min
Average arrival delay
1.0%
Cancelled
902
Flights in the data

Data through May 2026.

Alaska Airlines is the only airline in this data on this route, arriving on time 86% of the time across 902 flights. No comparison to make.

What the data says

Morning-you made the right choice.

BIL–SEA flights departing between 6–9 AM arrived on time 91% of the time, versus 71% between 6–9 PM.

Skip Tuesday if you can.

BIL–SEA flights arrived on time 89% of the time on Mondays. On Tuesdays: 81%.

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
  • Mon89%(130 flights)
  • Tue81%(126 flights)
  • Wed86%(124 flights)
  • Thu89%(127 flights)
  • Fri86%(128 flights)
  • Sat83%(123 flights)
  • Sun87%(133 flights)
On-time by departure window
  • 6–9 AM91%(358 flights)
  • 9 AM–12 PM80%(30 flights)
  • 12–3 PM89%(321 flights)
  • 3–6 PM91%(11 flights)
  • 6–9 PM71%(171 flights)
On-time trend by month
80%
May

Jun 80% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%90
July 202585%91
August 202580%88
September 202584%82
October 202596%88
November 202590%76
December 202570%60
January 202694%62
February 202693%55
March 202686%58
April 202698%60
May 202680%81

Keep nerding

Based on 902 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.