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Route Reliability

Baltimore → Portland

BWI–PWM · 452 miles · Baltimore/Washington International Thurgood Marshall Airport to Portland International Jetport

82
Pretty Reliable
WanderNerd Reliability Score
79%
Arrive within 15 minutes
5 min
Average arrival delay
1.3%
Cancelled
1,342
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 79% of the time across 1,342 flights. No comparison to make.

What the data says

Morning-you made the right choice.

BWI–PWM flights departing between 6–9 AM arrived on time 94% of the time, versus 63% between 9 PM–12 AM.

Sunday scaries are real for this one.

BWI–PWM flights arrived on time 83% of the time on Tuesdays. On Sundays: 73%.

Slipping a little lately.

BWI–PWM flights arrived on time 80% of the time over the last three months in the data, compared with 84% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon79%(194 flights)
  • Tue83%(183 flights)
  • Wed82%(181 flights)
  • Thu75%(194 flights)
  • Fri80%(201 flights)
  • Sat83%(184 flights)
  • Sun73%(188 flights)
On-time by departure window
  • 6–9 AM94%(104 flights)
  • 9 AM–12 PM92%(316 flights)
  • 12–3 PM80%(326 flights)
  • 3–6 PM68%(176 flights)
  • 6–9 PM82%(142 flights)
  • 9 PM–12 AM63%(261 flights)
On-time trend by month
78%
May

Jun 65% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202565%119
July 202556%118
August 202582%135
September 202588%121
October 202585%123
November 202586%107
December 202579%108
January 202689%93
February 202684%90
March 202680%102
April 202681%103
May 202678%106

Same trip, other airports

Keep nerding

Based on 1,342 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.