$110+ Cheap flights from Ontario to Baltimore (ONT - BWI)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Apr 16 — Apr 231
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Baltimore with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Ontario to Baltimore/Washington are usually found in February or January, booked 70 days in advance, depart on a Tuesday or Thursday and return on a Tuesday
Cheap flight deals from Ontario to Baltimore
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to BaltimoreExplore the most affordable flight options available from Ontario to Baltimore. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 17, 2026.
Explore the most affordable flight options available from Ontario to Baltimore. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 17, 2026.
This Frontier deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/85:18 pm
ONT
- BWI
1 stop13h 16m
Frontier
Wed 4/153:06 pm
BWI
- ONT
1 stop8h 33m
Frontier
Deal found 3/15![Frontier logo]()
$210
This Expedia deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/138:06 pm
ONT
- BWI
1 stop21h 17m
Frontier
Sat 5/165:34 pm
BWI
- ONT
1 stop17h 01m
Frontier
Deal found 3/15![Frontier logo]()
$215
This Frontier deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/107:40 pm
ONT
- BWI
1 stop12h 23m
Frontier
Wed 4/153:06 pm
BWI
- ONT
1 stop8h 33m
Frontier
Deal found 3/12![Frontier logo]()
$220
This Booking.com deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/148:06 pm
ONT
- BWI
1 stop21h 17m
Frontier
Tue 5/194:31 pm
BWI
- ONT
1 stop18h 04m
Frontier
Deal found 3/16![Frontier logo]()
$228
This Booking.com deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/78:06 pm
ONT
- BWI
1 stop21h 17m
Frontier
Mon 5/115:17 pm
BWI
- ONT
1 stop17h 18m
Frontier
Deal found 3/16![Frontier logo]()
$233
This Booking.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/85:18 pm
ONT
- BWI
1 stop13h 16m
Frontier
Sat 4/1111:49 am
BWI
- ONT
1 stop9h 56m
Frontier
Deal found 3/15![Frontier logo]()
$237
This Booking.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/18:26 am
ONT
- BWI
1 stop8h 43m
Frontier
Mon 5/412:15 pm
BWI
- ONT
1 stop22h 20m
Frontier
Deal found 3/15![Frontier logo]()
$242
This Booking.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/18:26 am
ONT
- BWI
1 stop8h 43m
Frontier
Sun 5/37:52 pm
BWI
- ONT
1 stop23h 46m
Frontier
Deal found 3/13![Frontier logo]()
$249
This Booking.com deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/78:06 pm
ONT
- BWI
1 stop21h 17m
Frontier
Tue 5/124:31 pm
BWI
- ONT
1 stop18h 04m
Frontier
Deal found 3/16![Frontier logo]()
$252
This Booking.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/38:21 am
ONT
- BWI
1 stop23h 59m
Frontier
Fri 5/85:17 pm
BWI
- ONT
1 stop18h 03m
Frontier
Deal found 3/13![Frontier logo]()
$254
This Frontier deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/47:40 pm
ONT
- BWI
1 stop10h 59m
Frontier
Thu 4/910:29 am
BWI
- ONT
1 stop11h 16m
Frontier
Deal found 3/14![Frontier logo]()
$255
Best flights from Ontario to BaltimoreDiscover carefully curated flight deals from Ontario to Baltimore that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 17, 2026.
Discover carefully curated flight deals from Ontario to Baltimore that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 17, 2026.
This Southwest deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/149:55 pm
ONT
- BWI
Nonstop4h 45m
Southwest
Tue 4/211:45 pm
BWI
- ONT
Nonstop5h 35m
Southwest
Deal found 3/15![Southwest logo]()
$381
This United Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/36:05 am
ONT
- BWI
1 stop7h 19m
United Airlines
Thu 4/93:42 pm
BWI
- ONT
1 stop9h 49m
United Airlines
Deal found 3/12![United Airlines logo]()
$434
This Alaska Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/303:26 pm
ONT
- BWI
1 stop11h 18m
Alaska Airlines
Sun 5/37:04 am
BWI
- ONT
1 stop10h 28m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$443
This Delta deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/910:25 pm
ONT
- BWI
1 stop8h 14m
Delta
Wed 4/157:00 am
BWI
- ONT
1 stop7h 36m
Delta
Deal found 3/14![Delta logo]()
$477
This Southwest deal was found by Cheapflights users on 3/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1311:55 pm
ONT
- BWI
2 stops8h 55m
Southwest
Wed 4/156:30 am
BWI
- ONT
1 stop10h 00m
Southwest
Deal found 3/17![Southwest logo]()
$393
This United Airlines deal was found by Cheapflights users on 3/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/126:49 pm
ONT
- BWI
1 stop8h 11m
United Airlines
Wed 4/1511:08 am
BWI
- ONT
2 stops14h 37m
United Airlines
Deal found 3/17![United Airlines logo]()
$436
This Alaska Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/26:00 am
ONT
- BWI
1 stop9h 16m
Alaska Airlines
Tue 5/57:04 am
BWI
- ONT
1 stop10h 28m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$443
This Southwest deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/32:50 pm
ONT
- BWI
1 stop7h 05m
Southwest
Thu 4/912:45 pm
BWI
- ONT
Nonstop5h 30m
Southwest
Deal found 3/12![Southwest logo]()
$424
This Southwest deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/289:55 pm
ONT
- BWI
Nonstop4h 45m
Southwest
Sun 5/317:30 pm
BWI
- ONT
1 stop7h 40m
Southwest
Deal found 3/14![Southwest logo]()
$424
This Alaska Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/266:00 am
ONT
- BWI
1 stop20h 44m
Alaska Airlines
Wed 4/297:04 am
BWI
- ONT
1 stop10h 28m
Alaska Airlines
Deal found 3/14![Alaska Airlines logo]()
$530
Last-minute flights from Ontario to BaltimoreDiscover last-minute flight deals from Ontario to Baltimore. Data last updated March 17, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Baltimore. Data last updated March 17, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/47:40 pm
ONT
- BWI
1 stop10h 59m
Frontier
Thu 4/910:29 am
BWI
- ONT
1 stop11h 16m
Frontier
Deal found 3/14![Frontier logo]()
$255
This Frontier deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/47:40 pm
ONT
- BWI
1 stop10h 59m
Frontier
Tue 4/143:06 pm
BWI
- ONT
1 stop8h 33m
Frontier
Deal found 3/14![Frontier logo]()
$265
This Frontier deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/47:40 pm
ONT
- BWI
1 stop10h 59m
Frontier
Tue 4/213:06 pm
BWI
- ONT
1 stop8h 33m
Frontier
Deal found 3/16![Frontier logo]()
$280
This Frontier deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/47:40 pm
ONT
- BWI
1 stop10h 59m
Frontier
Sat 4/1111:49 am
BWI
- ONT
1 stop9h 56m
Frontier
Deal found 3/14![Frontier logo]()
$290
This Frontier deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/47:40 pm
ONT
- BWI
1 stop10h 59m
Frontier
Sat 4/184:34 pm
BWI
- ONT
1 stop9h 03m
Frontier
Deal found 3/15![Frontier logo]()
$300
This Frontier deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/85:18 pm
ONT
- BWI
1 stop13h 16m
Frontier
Tue 4/143:06 pm
BWI
- ONT
1 stop8h 33m
Frontier
Deal found 3/16![Frontier logo]()
$210
This Booking.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/85:18 pm
ONT
- BWI
1 stop13h 16m
Frontier
Sat 4/1111:49 am
BWI
- ONT
1 stop9h 56m
Frontier
Deal found 3/15![Frontier logo]()
$237
This Frontier deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/107:40 pm
ONT
- BWI
1 stop12h 23m
Frontier
Wed 4/153:06 pm
BWI
- ONT
1 stop8h 33m
Frontier
Deal found 3/12![Frontier logo]()
$220
This Frontier deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/117:40 pm
ONT
- BWI
1 stop10h 59m
Frontier
Wed 4/153:06 pm
BWI
- ONT
1 stop8h 33m
Frontier
Deal found 3/12![Frontier logo]()
$285
This Frontier deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/178:26 am
ONT
- BWI
1 stop8h 49m
Frontier
Sat 4/254:34 pm
BWI
- ONT
1 stop9h 03m
Frontier
Deal found 3/14![Frontier logo]()
$286
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2812:59 am
ONT
- BWI
2 stops20h 45m
Multiple Airlines
Mon 5/411:05 am
BWI
- ONT
1 stop8h 33m
Multiple Airlines
Deal found 3/12![Multiple Airlines logo]()
$291
One-way flights from Ontario to BaltimoreSearch for one-way flight options from Ontario to Baltimore. Find affordable one-way fares based on user searches. Data last updated March 17, 2026.
Search for one-way flight options from Ontario to Baltimore. Find affordable one-way fares based on user searches. Data last updated March 17, 2026.
This Frontier deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/18:26 am
ONT
- BWI
1 stop8h 43m
Frontier
Deal found 3/15![Frontier logo]()
$110
This Frontier deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/85:18 pm
ONT
- BWI
1 stop13h 16m
Frontier
Deal found 3/15![Frontier logo]()
$111
This Super.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/148:06 pm
ONT
- BWI
1 stop21h 17m
Frontier
Deal found 3/13![Frontier logo]()
$114
This Booking.com deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/108:06 pm
ONT
- BWI
1 stop21h 17m
Frontier
Deal found 3/16![Frontier logo]()
$115
This Frontier deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/107:40 pm
ONT
- BWI
1 stop12h 23m
Frontier
Deal found 3/13![Frontier logo]()
$116
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:59 am
ONT
- BWI
2 stops20h 45m
Frontier
Deal found 3/13![Frontier logo]()
$125
This Super.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/38:21 am
ONT
- BWI
1 stop23h 59m
Frontier
Deal found 3/15![Frontier logo]()
$129
This Booking.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/248:26 am
ONT
- BWI
1 stop8h 43m
Frontier
Deal found 3/12![Frontier logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1412:59 am
ONT
- BWI
2 stops20h 45m
Frontier
Deal found 3/13![Frontier logo]()
$134
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1111:36 am
ONT
- BWI
2 stops32h 21m
Frontier
Deal found 3/12![Frontier logo]()
$135
Find flight deals from Ontario to Baltimore
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Baltimore (BWI). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated March 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $210 (Frontier) |
One-way from | $110 (Frontier) |
Popular in | June |
Cheapest in | February |
Average price | $470 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Baltimore that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 17, 2026.
Use the filters below to find and compare flights from Ontario to Baltimore that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Tue 4/14
9:55 pm-5:40 am
Nonstop4h 45m
Baltimore/Washington
Tue 4/21
1:45 pm-4:20 pm
Nonstop5h 35m
$381
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Mon 4/13
11:55 pm-11:50 am
2 stops8h 55m
Baltimore/Washington
Wed 4/15
6:30 am-1:30 pm
1 stop10h 00m
$393
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Fri 4/3
2:50 pm-12:55 am
1 stop7h 05m
Baltimore/Washington
Thu 4/9
12:45 pm-3:15 pm
Nonstop5h 30m
$424
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Thu 5/28
9:55 pm-5:40 am
Nonstop4h 45m
Baltimore/Washington
Sun 5/31
7:30 pm-12:10 am
1 stop7h 40m
$424
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Fri 4/3
6:05 am-4:24 pm
1 stop7h 19m
Baltimore/Washington
Thu 4/9
3:42 pm-10:31 pm
1 stop9h 49m
$434
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Sun 4/12
6:49 pm-6:00 am
1 stop8h 11m
Baltimore/Washington
Wed 4/15
11:08 am-10:45 pm
2 stops14h 37m
$436
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Thu 4/30
3:26 pm-5:44 am
1 stop11h 18m
Baltimore/Washington
Sun 5/3
7:04 am-2:32 pm
1 stop10h 28m
$443
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Sat 5/2
6:00 am-6:16 pm
1 stop9h 16m
Baltimore/Washington
Tue 5/5
7:04 am-2:32 pm
1 stop10h 28m
$443
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Thu 4/9
10:25 pm-9:39 am
1 stop8h 14m
Baltimore/Washington
Wed 4/15
7:00 am-11:36 am
1 stop7h 36m
$477
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Sun 4/26
6:00 am-5:44 am
1 stop20h 44m
Baltimore/Washington
Wed 4/29
7:04 am-2:32 pm
1 stop10h 28m
$530
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from Ontario to Baltimore
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Baltimore in March.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-Baltimore flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Baltimore flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Baltimore flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Baltimore flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Baltimore flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Ontario to Baltimore
Have a flexible travel schedule? Discover the best time to fly to Baltimore from Ontario with our price prediction graph.
ONT-BWI
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Ontario to Baltimore
Prices
Airlines
How far ahead should I book a flight from Ontario to Baltimore?
Use this chart to determine the optimal time to book a round-trip flight from Ontario to Baltimore. Price data was last updated on March 13, 2026.
The best time to book flights from Ontario to Baltimore is 70 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from Ontario to Baltimore?
Currently, August is the cheapest month in which you can book a flight from Ontario to Baltimore (average of $93). Flying from Ontario to Baltimore in March is currently the most expensive (average of $195). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ONT to BWI?
Find hourly flight availability from Ontario to Baltimore. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 17, 2026.
When flying from Ontario to Baltimore, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Reviews of airlines servicing Baltimore
Get insights into the airlines that provide service to Baltimore. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Baltimore. Reviews last updated March 17, 2026.
Read reviews from past customers who have flown Southwest,Delta, andUnited Airlines from Ontario to Baltimore. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Overall
8.0
Entertainment
7.5
Boarding
8.1
Crew
8.6
Comfort
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Related info for your journey
Find useful and relevant information for your journey from Ontario to Baltimore. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Ontario to Baltimore
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Complete your trip
Complete your trip to Baltimore by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Baltimore by cabin class
Find flights from Ontario to Baltimore, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Baltimore flights
Browse other Ontario and Baltimore flight options. Last updated on March 17, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on March 17, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 6 airlines flying from Ontario to Baltimore
Discover the top 6 airlines that operate flights from Ontario to Baltimore. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$72 | Average$234 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$136 | Average$252 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$183 | Average$427 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$256 | Average$388 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$311 | Average$544 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$339 | Average$475 | FlexibilityNo cancel fee | On-time63% |