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Route Reliability

HLN → Seattle

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

79
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
7 min
Average arrival delay
0.8%
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 75% of the time across 364 flights. No comparison to make.

What the data says

The late departure is the smart one here.

HLN–SEA flights departing between 6–9 PM arrived on time 80% of the time, versus 70% between 3–6 PM.

Thursdays have been rough.

HLN–SEA flights arrived on time 81% of the time on Tuesdays and just 65% on Thursdays. That gap is worth planning around.

Slipping a little lately.

HLN–SEA flights arrived on time 79% of the time over the last three months in the data, compared with 82% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon77%(52 flights)
  • Tue81%(52 flights)
  • Wed73%(52 flights)
  • Thu65%(51 flights)
  • Fri78%(49 flights)
  • Sat75%(51 flights)
  • Sun77%(53 flights)
On-time by departure window
  • 3–6 PM70%(176 flights)
  • 6–9 PM80%(184 flights)
On-time trend by month
70%
May

Jun 57% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202557%30
July 202568%31
August 202555%31
September 202573%30
October 202587%31
November 202579%29
December 202567%30
January 202690%31
February 202689%28
March 202683%29
April 202683%30
May 202670%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.