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Route Reliability

Seattle → BIL

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

86
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
2 min
Average arrival delay
0.8%
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 82% of the time across 902 flights. No comparison to make.

What the data says

The late departure is the smart one here.

SEA–BIL flights departing between 6–9 PM arrived on time 97% of the time, versus 71% between 3–6 PM.

Skip Thursday if you can.

SEA–BIL flights arrived on time 86% of the time on Wednesdays. On Thursdays: 78%.

Ticking up lately.

SEA–BIL flights arrived on time 93% of the time over the last three months in the data, compared with 88% 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
  • Mon83%(130 flights)
  • Tue84%(127 flights)
  • Wed86%(124 flights)
  • Thu78%(128 flights)
  • Fri82%(126 flights)
  • Sat80%(124 flights)
  • Sun82%(133 flights)
On-time by departure window
  • 6–9 AM85%(41 flights)
  • 9 AM–12 PM84%(147 flights)
  • 12–3 PM75%(173 flights)
  • 3–6 PM71%(192 flights)
  • 6–9 PM97%(107 flights)
  • 9 PM–12 AM88%(232 flights)
On-time trend by month
83%
May

Jun 68% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%90
July 202568%91
August 202564%89
September 202584%82
October 202590%88
November 202590%76
December 202580%61
January 202692%61
February 202691%55
March 202697%58
April 202698%60
May 202683%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.