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Route Reliability

Seattle → Bellingham

SEA–BLI · 93 miles · Seattle–Tacoma International Airport to Bellingham International Airport

84
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
2 min
Average arrival delay
2.1%
Cancelled
1,304
Flights in the data

Data through May 2026.

Alaska Airlines is the only airline in this data on this route, arriving on time 84% of the time across 1,304 flights. No comparison to make.

What the data says

The late departure is the smart one here.

SEA–BLI flights departing between 6–9 PM arrived on time 92% of the time, versus 78% between 9 AM–12 PM.

Friday is doing you no favors.

SEA–BLI flights arrived on time 89% of the time on Wednesdays. On Fridays: 74%.

Ticking up lately.

SEA–BLI flights arrived on time 89% of the time over the last three months in the data, compared with 84% 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
  • Mon86%(186 flights)
  • Tue86%(184 flights)
  • Wed89%(180 flights)
  • Thu84%(182 flights)
  • Fri74%(181 flights)
  • Sat86%(180 flights)
  • Sun84%(183 flights)
On-time by departure window
  • 9 AM–12 PM78%(336 flights)
  • 12–3 PM82%(245 flights)
  • 3–6 PM85%(91 flights)
  • 6–9 PM92%(192 flights)
  • 9 PM–12 AM86%(412 flights)
On-time trend by month
88%
May

Jun 71% → May 88% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%119
July 202581%123
August 202581%123
September 202588%120
October 202586%122
November 202588%106
December 202576%121
January 202684%92
February 202692%79
March 202685%88
April 202693%90
May 202688%93

Keep nerding

Based on 1,304 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.