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Route Reliability

Seattle → HLN

SEA–HLN · 491 miles · Seattle–Tacoma International Airport to HLN Airport

90
Nerd Approved
WanderNerd Reliability Score
85%
Arrive within 15 minutes
2 min early
Average arrival delay
0.5%
Cancelled
364
Flights in the data

Data through May 2026.

Alaska Airlines is the only airline in this data on this route, arriving on time 85% of the time across 364 flights. No comparison to make.

What the data says

The 3–6 PM departure wins.

SEA–HLN flights departing between 3–6 PM arrived on time 90% of the time, versus 80% between 12–3 PM.

Thursday is the weak spot.

SEA–HLN flights arrived on time 90% of the time on Tuesdays. On Thursdays: 78%.

Flights on this route

The breakdown

On-time by weekday
  • Mon87%(52 flights)
  • Tue90%(52 flights)
  • Wed84%(51 flights)
  • Thu78%(51 flights)
  • Fri82%(51 flights)
  • Sat84%(51 flights)
  • Sun89%(53 flights)
On-time by departure window
  • 12–3 PM80%(175 flights)
  • 3–6 PM90%(186 flights)
On-time trend by month
73%
May

Jun 73% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%30
July 202577%31
August 202581%31
September 202583%30
October 202590%31
November 202586%29
December 202577%31
January 202694%31
February 202693%28
March 202697%29
April 202697%30
May 202673%30

Keep nerding

Based on 364 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.