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Route Reliability

Baltimore → Chicago

BWI–ORD · 622 miles · Baltimore/Washington International Thurgood Marshall Airport to Chicago O'Hare International Airport

71
Usually Fine
WanderNerd Reliability Score
76%
Arrive within 15 minutes
16 min
Average arrival delay
2.3%
Cancelled
2,688
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.Southwest Airlines86%154 flights
  2. 2.American Airlines76%1,193 flights
  3. 3.United Airlines75%1,159 flights
  4. 4.Frontier Airlines66%150 flights

Not enough history to rank: Spirit Airlines (32 flights). We rank airlines only after 100 flights on the route.

What the data says

Morning flights do better here.

BWI–ORD flights departing between 3–6 AM arrived on time 91% of the time, versus 55% between 3–6 PM.

Sunday scaries are real for this one.

BWI–ORD flights arrived on time 82% of the time on Saturdays. On Sundays: 73%.

Southwest Airlines has a clear lead on this route.

Southwest Airlines arrived on time 86% of the time on this route; Frontier Airlines managed 66%.

Ticking up lately.

BWI–ORD flights arrived on time 77% of the time over the last three months in the data, compared with 74% 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
  • Mon74%(401 flights)
  • Tue78%(341 flights)
  • Wed75%(346 flights)
  • Thu76%(396 flights)
  • Fri73%(391 flights)
  • Sat82%(326 flights)
  • Sun73%(419 flights)
On-time by departure window
  • 3–6 AM91%(96 flights)
  • 6–9 AM90%(624 flights)
  • 9 AM–12 PM85%(798 flights)
  • 12–3 PM70%(84 flights)
  • 3–6 PM55%(528 flights)
  • 6–9 PM62%(467 flights)
  • 9 PM–12 AM78%(23 flights)
On-time trend by month
80%
May

Jun 74% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202574%235
July 202566%232
August 202576%249
September 202583%248
October 202579%246
November 202575%203
December 202564%200
January 202675%143
February 202683%162
March 202673%188
April 202678%244
May 202680%270

Same trip, other airports

Keep nerding

Based on 2,688 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.