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Route Reliability

Seattle → Baltimore

SEA–BWI · 2,335 miles · Seattle–Tacoma International Airport to Baltimore/Washington International Thurgood Marshall Airport

87
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
1 min early
Average arrival delay
0.4%
Cancelled
718
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.Alaska Airlines83%599 flights
  2. 2.Southwest Airlines77%119 flights

What the data says

Departure time hasn't mattered much.

On-time rates stay between 81% and 84% across the day.

Sunday scaries are real for this one.

SEA–BWI flights arrived on time 89% of the time on Saturdays. On Sundays: 76%.

Alaska Airlines has a slight edge here.

Alaska Airlines arrived on time 83% of the time on this route; Southwest Airlines managed 77%.

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
  • Mon79%(104 flights)
  • Tue88%(98 flights)
  • Wed82%(102 flights)
  • Thu80%(104 flights)
  • Fri82%(104 flights)
  • Sat89%(94 flights)
  • Sun76%(106 flights)
On-time by departure window
  • 9 AM–12 PM84%(360 flights)
  • 9 PM–12 AM81%(352 flights)
On-time trend by month
83%
May

Jun 84% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202584%86
July 202570%90
August 202571%93
September 202583%90
October 202593%55
November 202588%50
December 202583%60
January 202682%34
February 202693%27
March 202687%31
April 202695%38
May 202683%58

Same trip, other airports

Keep nerding

Based on 718 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.