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ONT - BWI

$100 Find Cheap Flights from Ontario to Baltimore - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$189
Typical prices: $382-$547
Frontier
Sat 11/3Tue 11/13
ONT - BWI • 2 stops
Cheapest one-way
$100
Typical prices: $205-$291
Frontier
Sat 10/27
ONT - BWI • 2 stops
Nonstop flights
Not available
There are currently no direct flights between Ontario and Baltimore. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to book
17 weeks
in advance
Our data shows that travelers who book at least 17 weeks in advance save around 31% compared to booking last minute.
Insights
Insights
When to travel
February
Cheapest • 17% price drop
July
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Austin Bergstrom (AUS)
Cheapest • Avg $326 (round-trip)
Phoenix Sky Harbor Intl (PHX)
Shortest trip • 7h 09m (one-way)
Insights
Insights
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We hope you love your trip to Baltimore!
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Expert advice
Flight Deals

Cheap Flights from Ontario to Baltimore (ONT-BWI)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Baltimore

Tue, Nov 3 - Fri, Nov 13
Frontier Logo
6:25 am - 11:08 amONT  Ontario-BWI Baltimore/Washington
25h 43m2 stops Denver Intl Dallas/Fort Worth
Frontier Logo
6:28 pm - 10:42 amBWI  Baltimore/Washington-ONT Ontario
19h 14m2 stops Detroit Metropolitan Wayne County Denver Intl
$189Frontier
Tue, Oct 20 - Wed, Oct 21
Frontier Logo
5:25 pm - 9:27 amONT  Ontario-BWI Baltimore/Washington
13h 02m2 stops Las Vegas Harry Reid Intl Atlanta Hartsfield-Jackson
Frontier Logo
12:37 pm - 11:50 pmBWI  Baltimore/Washington-ONT Ontario
14h 13m2 stops Dallas/Fort Worth Denver Intl
$197Frontier
Sat, Nov 14 - Tue, Nov 17
Multiple Airlines Logo
11:52 am - 11:22 amONT  Ontario-BWI Baltimore/Washington
20h 30m2 stops Denver Intl Minneapolis St Paul
Multiple Airlines Logo
5:40 am - 11:51 pmBWI  Baltimore/Washington-ONT Ontario
21h 11m3 stops Atlanta Hartsfield-Jackson Dallas/Fort Worth Denver Intl
$304Multiple Airlines
Tue, Oct 27 - Mon, Nov 2
Multiple Airlines Logo
11:13 am - 5:20 amONT  Ontario-BWI Baltimore/Washington
15h 07m1 stop Seattle/Tacoma Intl
Multiple Airlines Logo
2:07 pm - 7:08 pmBWI  Baltimore/Washington-ONT Ontario
8h 01m1 stop Dallas/Fort Worth
$324Multiple Airlines
Tue, Dec 1 - Sat, Dec 5
Southwest Logo
1:30 pm - 10:55 pmONT  Ontario-BWI Baltimore/Washington
6h 25m1 stop Las Vegas Harry Reid Intl
Southwest Logo
7:55 am - 12:45 pmBWI  Baltimore/Washington-ONT Ontario
7h 50m1 stop Chicago Midway
$385Southwest
Mon, Nov 16 - Tue, Nov 17
Southwest Logo
8:55 am - 7:20 pmONT  Ontario-BWI Baltimore/Washington
7h 25m1 stop Sacramento Intl
Southwest Logo
6:15 am - 10:45 amBWI  Baltimore/Washington-ONT Ontario
7h 30m1 stop Dallas Love Field
$385Southwest
Thu, Jan 28 - Tue, Feb 2
American Airlines Logo
6:00 am - 4:08 pmONT  Ontario-BWI Baltimore/Washington
7h 08m1 stop Dallas/Fort Worth
American Airlines Logo
12:39 pm - 6:51 pmBWI  Baltimore/Washington-ONT Ontario
9h 12m1 stop Dallas/Fort Worth
$385American Airlines
Wed, Nov 18 - Mon, Nov 23
American Airlines Logo
10:30 am - 10:53 pmONT  Ontario-BWI Baltimore/Washington
9h 23m1 stop Dallas/Fort Worth
American Airlines Logo
6:33 am - 1:19 pmBWI  Baltimore/Washington-ONT Ontario
9h 46m1 stop Dallas/Fort Worth
$385American Airlines
Thu, Dec 3 - Wed, Jan 6
Delta Logo
11:08 pm - 9:22 amONT  Ontario-BWI Baltimore/Washington
7h 14m1 stop Atlanta Hartsfield-Jackson
Delta Logo
7:10 am - 12:30 pmBWI  Baltimore/Washington-ONT Ontario
8h 20m1 stop Salt Lake City
$385Delta
Tue, Oct 20 - Sat, Oct 24
Delta Logo
5:03 pm - 5:45 amONT  Ontario-BWI Baltimore/Washington
9h 42m1 stop Salt Lake City
Delta Logo
7:00 am - 12:36 pmBWI  Baltimore/Washington-ONT Ontario
8h 36m1 stop Salt Lake City
$385Delta
Booking Insights

Price, demand and travel trends for Ontario to Baltimore flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

How much is a round-trip flight from Ontario to Baltimore?

Round-trip flights from Ontario to Baltimore typically range from $382 to $547. The lowest price found in the past 5 days was $189, on Frontier.

What's the cheapest day of the week to fly from Ontario to Baltimore?

Based on deals KAYAK users found in the last 12 months, Thursday is the cheapest day of the week to fly from Ontario to Baltimore. It’s 8% cheaper than the average day, while Sunday is the most expensive, with prices 21% higher.

What’s the cheapest month to fly from Ontario to Baltimore?

•February is the cheapest month to fly from Ontario to Baltimore at $376 round-trip.
•June ($550) and December ($533) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 46% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

When are flights from Ontario to Baltimore the cheapest?

Flights from Ontario to Baltimore are cheapest 17 weeks before departure. Booking in this window typically costs about 31% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

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Expert advice

Expert advice for your flight from Ontario to Baltimore

 
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Read more
Harriet Baskas

Harriet Baskas

Expert on BWI

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more

Key details for Ontario to Baltimore flights

Low season

October

Cheapest flight

$100
Beat the crowds with an average 41% drop in travelers.
The most popular month to fly with an average 30% increase in travelers.
One-way flight from Ontario to Baltimore

When to book flights from Ontario to Baltimore

Are your dates flexible? Find out the best times to travel from Ontario to Baltimore based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Ontario to Baltimore flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from Ontario to Baltimore?

    Two cabin classes are available on flights from Ontario to Baltimore:

    • Economy Class
    • First Class

  • How long is a flight from Ontario to Baltimore?

    A nonstop flight from Ontario to Baltimore takes 00m, covering 2,276 miles.

  • Do I need a passport to fly from Ontario to Baltimore?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

  • How much should I expect to pay for a Ontario to Baltimore flight?

    Round-trip flights from Ontario to Baltimore range from $382 to $547, with an average of $455 over the past 12 months. Anything below $382 counts as a good deal.

  • How expensive are last-minute Ontario to Baltimore flights?

    Last-minute fares on this route (booked within two weeks of departure) run 10% above the $455 route average. Book 17 weeks before departure for the lowest fares.

  • How much can I save by taking a layover when flying from Ontario to Baltimore?

    On this route, layover flights are cheaper than nonstop options on average. Layover fares average $326 round-trip via Austin Bergstrom (AUS), compared to $503 for nonstop.

  • What is the standard checked-bag allowance on flights from Ontario to Baltimore?

    There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $45–$90 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

  • Which aircraft model is used most often on flights from Ontario to Baltimore?

    The Boeing 737 MAX 9 family is used most often on this route, operated mainly by Alaska Airlines and United Airlines. Other aircraft seen on the route include Boeing 737-800 Passenger/BBJ2 (winglets) variants.

  • How are flight prices from Ontario to Baltimore looking right now?

    One-way fares from Ontario to Baltimore are currently lower than usual. Average one-way flight prices are about $182, which is 30% below the typical average for this route.

  • What car rental options are available at Baltimore/Washington Airport (BWI)?

    Baltimore/Washington Airport (BWI) hosts 5 major car rental companies, with daily rates starting from around $25 for economy cars. Top options include:

    • NextCar
    • Hertz
    • Dollar
    • Thrifty
    • Budget

  • Which airports can I use when flying from Ontario to Baltimore?

    Flights from Ontario to Baltimore usually depart from Ontario (ONT) and arrive at Baltimore/Washington (BWI).

  • Which airports do connecting flights from Ontario to Baltimore pass through?

    One-stop flights from Ontario to Baltimore most commonly connect through:

    • Denver Intl (DEN) - 22% of one-stop connections
    • Houston George Bush Intcntl (IAH) - 21% of one-stop connections
    • Dallas/Fort Worth (DFW) - 19% of one-stop connections
    • Atlanta Hartsfield-Jackson (ATL) - 13% of one-stop connections

  • Can I save money by using flexible dates for flights from Ontario to Baltimore?

    Yes. Flexible dates can save you up to 24% on flights from Ontario to Baltimore. Thursday is the cheapest departure day at $421 round-trip on average, while Sunday is the most expensive at $553, a difference of $132.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • How much time can I save by choosing a different layover airport from Ontario to Baltimore?

    Flying via Phoenix Sky Harbor Intl (PHX) gives the shortest average 1-stop total travel time at 7h 09m, compared with 7h 14m via Austin Bergstrom (AUS) and 7h 16m via Chicago Midway (MDW).

  • What is the time difference between Ontario and Baltimore?

    Baltimore is 3 hours ahead of Ontario (Eastern Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

  • What popular places can I visit in Baltimore?

    Some of the most popular sights in Baltimore are M&T Bank Stadium, National Aquarium Baltimore and Oriole Park At Camden Yards. These are among the most viewed places in Baltimore on KAYAK.

  • Which airlines offer extra legroom and free seat selection on Ontario to Baltimore flights?

    Among airlines operating Ontario to Baltimore flights:

    • Southwest: offers free seat selection

    Extra legroom and free seat selection availability depends on fare class and route.

  • Which airlines include bags at no extra cost on Ontario to Baltimore flights?

    Here are some options for this route, based on selected ticket types and cabin classes:

    • Southwest: a cabin bag in Economy Class class

    Bag allowance can vary by ticket type, cabin class, route and airline, so always check the fare details before booking.

Your guide to booking Ontario to Baltimore flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Thursday departure and avoid flying on Sunday. On this route, Thursday flights average $421, about $132 less than Sunday fares (24% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 17 weeks before you fly. On this route, that window historically saves about 31% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your Ontario to Baltimore trip for February. Fares historically average $376 round-trip in that month - typically $174 less than the most expensive month, which is June (based on the last 12 months).
  • If you have the time, taking a 1-stop flight through Austin Bergstrom Airport (AUS) can be cheaper than flying direct. The cheapest layover option averages $326 round-trip on this route - about $176 less than direct flights (based on the last 12 months).

More options for your flight from Ontario to Baltimore

Complete your trip to Baltimore with a hotel stay or car rental

Car rentals in Baltimore
Hotels in Baltimore
Vacations in Baltimore