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Route Reliability

Chicago → Baltimore

MDW–BWI · 611 miles · Chicago Midway International Airport to Baltimore/Washington International Thurgood Marshall Airport

76
Usually Fine
WanderNerd Reliability Score
79%
Arrive within 15 minutes
7 min
Average arrival delay
2.6%
Cancelled
1,856
Flights in the data

Data through May 2026.

Airlines on this route

  • Southwest Airlines80% on time · 1,759 flights
  • Frontier Airlines76% on time · 97 flights

Too little history on this route to call a winner. We rank airlines only after 100 flights each.

What the data says

Morning-you made the right choice.

MDW–BWI flights departing between 6–9 AM arrived on time 94% of the time, versus 62% between 9 PM–12 AM.

Skip Monday if you can.

MDW–BWI flights arrived on time 85% of the time on Saturdays. On Mondays: 74%.

Flights on this route

The breakdown

On-time by weekday
  • Mon74%(283 flights)
  • Tue85%(238 flights)
  • Wed78%(243 flights)
  • Thu78%(266 flights)
  • Fri82%(286 flights)
  • Sat85%(210 flights)
  • Sun76%(275 flights)
On-time by departure window
  • 3–6 AM92%(145 flights)
  • 6–9 AM94%(359 flights)
  • 9 AM–12 PM86%(352 flights)
  • 12–3 PM78%(324 flights)
  • 3–6 PM67%(254 flights)
  • 6–9 PM63%(239 flights)
  • 9 PM–12 AM62%(128 flights)
On-time trend by month
81%
May

Jun 72% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%176
July 202566%179
August 202578%181
September 202586%180
October 202585%185
November 202583%139
December 202576%139
January 202689%122
February 202677%112
March 202682%117
April 202682%131
May 202681%140

Same trip, other airports

Keep nerding

Based on 1,856 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.