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Route Reliability

Ontario → Baltimore

ONT–BWI · 2,283 miles · Ontario International Airport to Baltimore/Washington International Thurgood Marshall Airport

88
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
3 min
Average arrival delay
0.4%
Cancelled
277
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 81% of the time across 277 flights. No comparison to make.

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 84% of the time, against 80% between 9 PM–12 AM.

Thursday is the weak spot.

ONT–BWI flights arrived on time 89% of the time on Saturdays. On Thursdays: 74%.

Flights on this route

The breakdown

On-time by weekday
  • Mon79%(38 flights)
  • Tue78%(36 flights)
  • Wed85%(34 flights)
  • Thu74%(38 flights)
  • Fri86%(43 flights)
  • Sat89%(44 flights)
  • Sun77%(43 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM—(1 flights)
  • 9 AM–12 PM84%(75 flights)
  • 12–3 PM80%(50 flights)
  • 9 PM–12 AM80%(149 flights)
On-time trend by month
81%
May

Jun 65% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202565%26
July 202581%31
August 202583%30
September 202583%30
October 202584%31
November 202590%19
December 202582%17
March 202674%27
April 202693%30
May 202681%31

Same trip, other airports

Keep nerding

Based on 277 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.