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Route Reliability

Baltimore → Seattle

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

73
Usually Fine
WanderNerd Reliability Score
70%
Arrive within 15 minutes
12 min
Average arrival delay
0.7%
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.Southwest Airlines74%119 flights
  2. 2.Alaska Airlines69%599 flights

What the data says

The 3–6 PM departure wins.

BWI–SEA flights departing between 3–6 PM arrived on time 79% of the time, versus 57% between 12–3 PM.

Friday is doing you no favors.

BWI–SEA flights arrived on time 74% of the time on Sundays. On Fridays: 64%.

Southwest Airlines has a slight edge here.

Southwest Airlines arrived on time 74% of the time on this route; Alaska Airlines managed 69%.

Ticking up lately.

BWI–SEA flights arrived on time 63% of the time over the last three months in the data, compared with 58% 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
  • Mon69%(104 flights)
  • Tue73%(100 flights)
  • Wed67%(101 flights)
  • Thu66%(105 flights)
  • Fri64%(103 flights)
  • Sat73%(94 flights)
  • Sun74%(105 flights)
On-time by departure window
  • 6–9 AM77%(275 flights)
  • 9 AM–12 PM—(7 flights)
  • 12–3 PM57%(51 flights)
  • 3–6 PM79%(19 flights)
  • 6–9 PM65%(360 flights)
On-time trend by month
76%
May

Jun 61% → May 76% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202561%86
July 202557%91
August 202584%92
September 202587%90
October 202589%55
November 202580%50
December 202534%59
January 202666%35
February 202675%28
March 202639%31
April 202673%37
May 202676%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.