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BWI → ONT · about 4h 58m nonstop · 2,278 miles · 4 airlines · fares updated September 14, 2026
Fares shown are recorded lows. An agent confirms today's live price on the call.
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Call to book from $328(708) 866-8751The lowest fares recorded on this route in recent searches. Call and an agent checks whether a similar fare is still open for your dates.
Recorded fares for BWI to ONT from cached search data, not live quotes. An agent confirms availability and today's price on the call.
Looking for a cheap flight from Baltimore to Ontario? This page tracks the lowest fares we have recorded on the BWI to ONT route, the airlines that fly it, and the months when prices drop. Fares shown are recent lows, not live quotes; call (708) 866-8751 and an agent will price today's availability with you.
Recorded lows on BWI–ONT start at $328 one-way. That figure comes from cached search data and moves with demand, so treat it as a benchmark for what a good price looks like rather than a guaranteed fare.
Delta Air Lines and United Airlines both operate hubs at one end of this route, so nonstop or single-connection service is usually available, along with American Airlines and Southwest Airlines. Our agents can book any of them and compare fare classes side by side.
2,278 miles is a serious flight, roughly 4h 58m nonstop, and it is the range where premium economy or a domestic first-class seat can be worth asking about, particularly on midweek departures when upgrade fares drop.
Prices are currently typical for this route. Typical one-way lows run $328 to $555 by month; the lowest fare recorded recently was $328.
Lowest recorded one-way fare per month. Green marks the cheapest month.
Winter fares out of the Northeast peak around the holidays and February school breaks; late April to early June and September to early November are usually the calmest on price.
On this specific route our fare history shows October as the cheapest month and April as the most expensive, a spread of $270 between the two.
Midweek travel almost always beats weekends on price here. If your dates are flexible by a day or two, tell the agent; shifting a Friday departure to Thursday or a Sunday return to Monday is the single most reliable way to cut the fare.
For domestic travel, booking three to eight weeks ahead usually captures the best price. Inside two weeks, fares climb; more than four months out, airlines have not yet released their cheapest inventory.
Carriers most likely to serve this route, with the lowest fare recorded for each where our data names the airline. Agents compare all of them on one call.
| Airline | Recorded from | Changes on standard fares | Lowest fare brand | Call |
|---|---|---|---|---|
| Southwest Airlines | $328 | No fee, fare difference | Basic | Call(708) 866-8751 |
| Delta Air Lines | ask an agent | No fee, fare difference | Basic Economy | Call(708) 866-8751 |
| United Airlines | ask an agent | No fee, fare difference | Basic Economy | Call(708) 866-8751 |
| American Airlines | ask an agent | No fee, fare difference | Basic Economy | Call(708) 866-8751 |
Carriers listed are those most likely to serve the pair based on hubs and recorded fares. WarBird Flight is independent and not affiliated with any airline.
Recorded Southwest fares on BWI–ONT. Southwest on this route · independent service, not affiliated with Southwest.
Departures use Baltimore/Washington International Thurgood Marshall Airport (BWI), a hub for Southwest.
You will land at Ontario International Airport (ONT).
Fares from a neighboring airport are sometimes far lower than the drive is long. Agents quote all of these on one call.
Licensed agents at our partner agency handle these by phone, 24/7. No charge for a quote.
The lowest one-way fare we have recorded recently is $328. Fares change daily; call (708) 866-8751 for today's price.
A nonstop flight takes about 4h 58m to cover 2,278 miles. Connecting itineraries add two to five hours depending on the layover.
Delta Air Lines, United Airlines, American Airlines, and Southwest Airlines are the carriers most likely to serve this route. We book all of them.
Based on our fare history, October has the lowest recorded fares and April the highest.
Yes. Call (708) 866-8751 and a live agent will search every airline, quote today's fare, and book it for you. WarBird Flight is an independent travel booking service; calls are answered by licensed travel agents at our partner agency.
Baltimore/Washington International Thurgood Marshall Airport (BWI) is the airport for this route.
A government-issued photo ID such as a REAL ID-compliant driver's license, a passport, or a passport card. Children under 18 flying with an adult do not need ID on domestic flights. If your license is not REAL ID-compliant, bring a passport.
Yes on most carriers, with an unaccompanied-minor service fee and age limits that differ by airline. Nonstop flights are strongly preferred and some airlines require them for younger children. Agents can book the service, note the guardian details, and confirm the fee before you pay.
