BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
ONT→BWI

Ontario, CA (ONT) to Baltimore, MD (BWI) flight delay odds

84.0% of 281 official scheduled ONT-to-BWI flights arrived on time; 9.3% arrived at least 30 minutes late and 0.4% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALLower disruption
84.0%arrived on time
9.3%30+ min late
0.4%cancelled
281scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.2%all scheduled flights
120+ minutes late1.1%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+1.0 mincompleted flights

Which departure time was most reliable for ONT to BWI?

Among qualifying ONT-to-BWI departure window results, Night had the highest on-time rate: 86.3% of 153 flights. Afternoon was lowest at 78.0% across 50 flights.

Departure windowFlightsOn time30+ minCancelled
Late morning7682.9%9.2%1.3%
Afternoon5078.0%12.0%0.0%
Night15386.3%8.5%0.0%

Which weekday was most reliable for ONT to BWI?

Among qualifying ONT-to-BWI weekday results, Saturday had the highest on-time rate: 88.6% of 44 flights. Thursday was lowest at 78.9% across 38 flights.

DayFlightsOn time30+ minCancelled
Monday4080.0%7.5%2.5%
Tuesday3884.2%10.5%0.0%
Wednesday3585.7%14.3%0.0%
Thursday3878.9%13.2%0.0%
Friday4388.4%0.0%0.0%
Saturday4488.6%9.1%0.0%
Sunday4381.4%11.6%0.0%

Which airline was most reliable for ONT to BWI?

Only Southwest Airlines met the ONT-to-BWI airline threshold: 84.0% of 281 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines28184.0%9.3%0.4%

Which month was most reliable for ONT to BWI?

Among qualifying ONT-to-BWI month results, June 2026 had the highest on-time rate: 100.0% of 30 flights. March 2026 was lowest at 74.1% across 27 flights.

MonthFlightsOn time30+ minCancelled
July 20253180.6%19.4%0.0%
August 20253083.3%10.0%0.0%
September 20253080.0%13.3%0.0%
October 20253183.9%9.7%0.0%
November 20252085.0%5.0%5.0%
December 20251782.4%5.9%0.0%
March 20262774.1%14.8%0.0%
April 20263093.3%0.0%0.0%
May 20263180.6%9.7%0.0%
June 202630100.0%0.0%0.0%

What drove ONT to BWI delay minutes?

Airline was the largest recorded ONT-to-BWI delay category, accounting for 44.1% of 2,076 BTS-attributed delay minutes during July 2025–June 2026.

Airline44.1%
Late aircraft38.9%
National airspace17.0%
Weather0.0%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.