Ontario to Baltimore flights
The cheapest round trip we found from Ontario to Baltimore is $314 (Dec 25 – Jan 2, 2027, 1 stop), 7% below the usual $336.
ONT to BWI · Round trip · Economy · Prices per person in USD · Price found (1 day ago)
Cheapest found
Cheapest round trip by month
Lowest fare found per departure month| Month | Cheapest round trip |
|---|---|
| November 2026 | $362 |
| December 2026 | $181 (cheapest month) |
| January 2027 | $360 |
Cheapest dates in the next 4 months
Round trip, per person-
Dec 25 – Jan 2, 2027 8 nights · leave Fri$314 −7% vs usual$314 −7% vs usual Book
United Airlines 1 stop · 5h 46m -
Nov 24 – 26 2 nights · leave Tue$364 +8% vs usual$364 +8% vs usual Book
Southwest Airlines 1 stop · 5h 40m -
Nov 5 – 10 5 nights · leave Thu$434 +29% vs usual$434 +29% vs usual Book
Frontier Airlines 1 stop · 6h 09m -
Nov 6 – 10 4 nights · leave Fri$434 +29% vs usual$434 +29% vs usual Book
Frontier Airlines 1 stop · 6h 09m
Prices change often. The booking site shows the final price before you pay. Other dates? Set an alert
Things to do in Baltimore
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Airport transfer to Baltimore
Fixed prices from BWI on KiwitaxiTo see transfer prices here, turn on partner content in .
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Plan the rest of your trip
Baltimore · Dec 25 – Jan 2, 2027Partner links: we may earn a commission if you book, at no extra cost to you.
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Ontario to Baltimore: questions
How much does a flight from Ontario to Baltimore cost?
The cheapest round trip we have found right now is $314, leaving December 25 and returning January 2. The usual price on this route is about $336, so this fare is 7% less. Prices are per person, economy, in USD.
What is the cheapest month to fly from Ontario to Baltimore?
December 2026, with round trips from $181. The most expensive month in our data is November (from $362). Based on the 3 months ahead we have prices for.
Which airports do Ontario to Baltimore flights use?
Ontario airports include Ontario International (ONT). Baltimore airports include Baltimore/Wash International Thurgood Marshall (BWI). The prices on this page cover every airport in both cities (ONT and BWI are the city codes).
About this route
We track round-trip economy fares from Ontario (United States) to Baltimore (United States) using Travelpayouts / Aviasales data. The cheapest round trip we've found is $314, departing December 25 and returning January 2, about 7% below the usual $336. The cheapest month to fly in our data is December, from $181. Prices are per person and were correct when found; the final price is set by the airline or booking site when you book.