How reliable is Baltimore/Washington International Thurgood Marshall Airport?
Flights from BWI departed within 15 minutes of schedule in 73% of 554,755 flights in official BTS history — and weather is calmest in Jul. Here’s the full picture before you book.
Reliability score
on-time, cancellations & delays
Weather favorability
year-round climate
Origin-airport operations
What the departure punctuality at BWI looks like
On-time departures
across 554,755 flights
Source: BTS Airport Operations · data through 2026-06-25. Role-specific BTS departure history; advisory context, not a guarantee for any flight.
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Weather by month
When the weather works for you at Baltimore
A calm-weather score (0–100) for each month from decades of airport observations — how often conditions disrupt flying, not temperature. Higher is calmer.
Calmest month
Calmest flying weather of the year · 95/100 favorability
Roughest month
Most disruptive — low visibility & fog, snow · 84/100 favorability
The read on BWI
What the numbers say about flying through Baltimore/Washington International Thurgood Marshall Airport
Across official performance history, flights from Baltimore left within 15 minutes of schedule about 73% of the time over 554,755 flights. That's a middling record — neither a strength nor a red flag on its own. Pair it with a moderate cancellation rate of 1.8%. When a departure does run late, the typical delay is around 15 minutes.
On weather, Baltimore is an unusually calm-weather airport year-round. July is the calmest stretch for flying, scoring 95 out of 100 for favorable conditions, while January is the most disruptive at 84, driven mainly by low visibility & fog and snow. The year is relatively steady, so no single month stands out as one to avoid on weather alone.
None of this guarantees your specific flight — it’s the backdrop. To turn it into a booking, score real flights to Baltimore, read how we weigh it all in how the PlaneSane Score works, and brush up with how to pick a reliable flight and avoiding weather delays.
Common questions about BWI
- How reliable is Baltimore/Washington International Thurgood Marshall Airport (BWI)?
- Flights from Baltimore left within 15 minutes of schedule roughly 73% of the time across 554,755 flights of official history — a middling record — neither a strength nor a red flag on its own. The cancellation rate runs about 1.8%. It's advisory context, not a guarantee for any single flight.
- What is the best month to fly from BWI for good weather?
- July has the calmest flying weather at Baltimore/Washington International Thurgood Marshall Airport. January is the most disruptive, mainly from low visibility & fog and snow.
Planning a trip through Baltimore?
Score real flights to and from BWI on reliability, weather, and connection safety — not just price.