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Route Reliability

Chicago → Baltimore

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

69
Usually Fine
WanderNerd Reliability Score
73%
Arrive within 15 minutes
12 min
Average arrival delay
2.4%
Cancelled
2,694
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.American Airlines75%1,193 flights
  2. 2.United Airlines72%1,161 flights
  3. 3.Frontier Airlines66%150 flights
  4. 4.Southwest Airlines63%154 flights

Not enough history to rank: Spirit Airlines (36 flights). We rank airlines only after 100 flights on the route.

What the data says

Morning flights do better here.

ORD–BWI flights departing between 6–9 AM arrived on time 87% of the time, versus 63% between 6–9 PM.

Wednesday is the weak spot.

ORD–BWI flights arrived on time 78% of the time on Saturdays. On Wednesdays: 69%.

American Airlines runs this route best.

American Airlines arrived on time 75% of the time on this route; Southwest Airlines managed 63%.

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
  • Mon70%(405 flights)
  • Tue74%(339 flights)
  • Wed69%(346 flights)
  • Thu76%(399 flights)
  • Fri70%(396 flights)
  • Sat78%(323 flights)
  • Sun72%(414 flights)
On-time by departure window
  • 12–3 AM—(1 flights)
  • 3–6 AM—(7 flights)
  • 6–9 AM87%(597 flights)
  • 9 AM–12 PM77%(355 flights)
  • 12–3 PM68%(681 flights)
  • 3–6 PM71%(201 flights)
  • 6–9 PM63%(730 flights)
  • 9 PM–12 AM66%(50 flights)
On-time trend by month
76%
May

Jun 72% → May 76% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%234
July 202563%236
August 202576%249
September 202582%248
October 202579%246
November 202573%200
December 202562%203
January 202674%142
February 202677%163
March 202663%186
April 202671%244
May 202676%271

Same trip, other airports

Keep nerding

Based on 2,694 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.