$107+ 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 6/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Jun 15 — Jun 221
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 September or February, booked 50 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 May 16, 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 May 16, 2026.
This Expedia deal was found by Cheapflights users on 5/11. 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 6/38:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Tue 6/94:29 pm
BWI
- ONT
1 stop28h 23m
Frontier
Deal found 5/11![Frontier logo]()
$230
This CheapOair deal was found by Cheapflights users on 5/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/28:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Tue 6/94:29 pm
BWI
- ONT
1 stop28h 23m
Frontier
Deal found 5/11![Frontier logo]()
$240
This Expedia deal was found by Cheapflights users on 5/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/58:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Tue 6/94:29 pm
BWI
- ONT
1 stop28h 23m
Frontier
Deal found 5/12![Frontier logo]()
$250
This Expedia deal was found by Cheapflights users on 5/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/105:43 pm
ONT
- BWI
1 stop23h 53m
Frontier
Mon 7/205:32 pm
BWI
- ONT
1 stop27h 17m
Frontier
Deal found 5/12![Frontier logo]()
$270
This CheapOair deal was found by Cheapflights users on 5/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/48:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Mon 6/85:17 pm
BWI
- ONT
1 stop27h 19m
Frontier
Deal found 5/12![Frontier logo]()
$274
This CheapOair deal was found by Cheapflights users on 5/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/305:43 pm
ONT
- BWI
1 stop15h 51m
Frontier
Tue 8/44:29 pm
BWI
- ONT
1 stop28h 20m
Frontier
Deal found 5/12![Frontier logo]()
$280
This Booking.com deal was found by Cheapflights users on 5/12. 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.
Thu 8/135:43 pm
ONT
- BWI
1 stop23h 53m
Frontier
Thu 8/204:29 pm
BWI
- ONT
1 stop28h 23m
Frontier
Deal found 5/12![Frontier logo]()
$282
This CheapOair deal was found by Cheapflights users on 5/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/195:43 pm
ONT
- BWI
1 stop15h 51m
Frontier
Mon 6/225:32 pm
BWI
- ONT
1 stop27h 20m
Frontier
Deal found 5/11![Frontier logo]()
$290
This Orbitz deal was found by Cheapflights users on 5/12. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/105:43 pm
ONT
- BWI
1 stop23h 53m
Frontier
Sat 7/255:36 pm
BWI
- ONT
1 stop27h 13m
Frontier
Deal found 5/12![Frontier logo]()
$297
This CheapOair deal was found by Cheapflights users on 5/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/315:43 pm
ONT
- BWI
1 stop23h 53m
Frontier
Mon 8/35:32 pm
BWI
- ONT
1 stop27h 17m
Frontier
Deal found 5/12![Frontier logo]()
$300
This Super.com deal was found by Cheapflights users on 5/12. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/185:43 pm
ONT
- BWI
1 stop23h 54m
Frontier
Mon 6/225:32 pm
BWI
- ONT
1 stop27h 20m
Frontier
Deal found 5/12![Frontier logo]()
$301
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 May 16, 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 May 16, 2026.
This Southwest deal was found by Cheapflights users on 5/14. 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.
Tue 7/149:40 pm
ONT
- BWI
Nonstop4h 50m
Southwest
Wed 7/299:50 am
BWI
- ONT
Nonstop5h 15m
Southwest
Deal found 5/14![Southwest logo]()
$395
This Delta deal was found by Cheapflights users on 5/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/307:05 am
ONT
- BWI
1 stop7h 19m
Delta
Sat 6/67:00 am
BWI
- ONT
1 stop8h 19m
Delta
Deal found 5/12![Delta logo]()
$479
This Alaska Airlines deal was found by Cheapflights users on 5/14. 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.
Tue 9/87:10 am
ONT
- BWI
1 stop29h 24m
Alaska Airlines
Tue 9/157:50 am
BWI
- ONT
1 stop9h 28m
Alaska Airlines
Deal found 5/14![Alaska Airlines logo]()
$500
This Southwest deal was found by Cheapflights users on 5/15. 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.
Thu 9/2411:00 am
ONT
- BWI
1 stop8h 40m
Southwest
Mon 9/285:20 pm
BWI
- ONT
1 stop7h 25m
Southwest
Deal found 5/15![Southwest logo]()
$401
This Southwest deal was found by Cheapflights users on 5/11. 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.
Wed 6/39:55 pm
ONT
- BWI
Nonstop4h 45m
Southwest
Tue 6/309:50 am
BWI
- ONT
Nonstop5h 15m
Southwest
Deal found 5/11![Southwest logo]()
$407
This Southwest deal was found by Cheapflights users on 5/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/311:55 pm
ONT
- BWI
2 stops9h 25m
Southwest
Tue 6/96:50 am
BWI
- ONT
2 stops9h 05m
Southwest
Deal found 5/13![Southwest logo]()
$411
This Delta deal was found by Cheapflights users on 5/14. 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.
Sat 5/3010:00 pm
ONT
- BWI
1 stop8h 23m
Delta
Tue 6/211:50 am
BWI
- ONT
1 stop9h 46m
Delta
Deal found 5/14![Delta logo]()
$547
This Southwest deal was found by Cheapflights users on 5/15. 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.
Thu 8/275:15 am
ONT
- BWI
2 stops11h 20m
Southwest
Sun 8/307:55 am
BWI
- ONT
1 stop6h 50m
Southwest
Deal found 5/15![Southwest logo]()
$475
This Southwest deal was found by Cheapflights users on 5/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/94:45 pm
ONT
- BWI
2 stops10h 50m
Southwest
Sun 9/1311:10 am
BWI
- ONT
2 stops9h 05m
Southwest
Deal found 5/13![Southwest logo]()
$484
This Southwest deal was found by Cheapflights users on 5/12. 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 6/59:40 pm
ONT
- BWI
Nonstop4h 50m
Southwest
Tue 6/99:50 am
BWI
- ONT
Nonstop5h 15m
Southwest
Deal found 5/12![Southwest logo]()
$487
Last-minute flights from Ontario to BaltimoreDiscover last-minute flight deals from Ontario to Baltimore. Data last updated May 16, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Baltimore. Data last updated May 16, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 5/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/28:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Tue 6/94:29 pm
BWI
- ONT
1 stop28h 23m
Frontier
Deal found 5/11![Frontier logo]()
$240
This CheapOair deal was found by Cheapflights users on 5/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/28:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Wed 6/105:32 pm
BWI
- ONT
1 stop27h 20m
Frontier
Deal found 5/12![Frontier logo]()
$315
This Expedia deal was found by Cheapflights users on 5/11. 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 6/38:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Tue 6/94:29 pm
BWI
- ONT
1 stop28h 23m
Frontier
Deal found 5/11![Frontier logo]()
$230
This Expedia deal was found by Cheapflights users on 5/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/48:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Tue 6/94:29 pm
BWI
- ONT
1 stop28h 23m
Frontier
Deal found 5/12![Frontier logo]()
$270
This CheapOair deal was found by Cheapflights users on 5/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/48:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Mon 6/85:17 pm
BWI
- ONT
1 stop27h 19m
Frontier
Deal found 5/12![Frontier logo]()
$274
This Expedia deal was found by Cheapflights users on 5/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/58:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Tue 6/94:29 pm
BWI
- ONT
1 stop28h 23m
Frontier
Deal found 5/12![Frontier logo]()
$250
This CheapOair deal was found by Cheapflights users on 5/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/106:47 pm
ONT
- BWI
1 stop13h 49m
Frontier
Fri 6/125:32 pm
BWI
- ONT
1 stop27h 20m
Frontier
Deal found 5/12![Frontier logo]()
$325
This Super.com deal was found by Cheapflights users on 5/12. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/185:43 pm
ONT
- BWI
1 stop23h 54m
Frontier
Mon 6/225:32 pm
BWI
- ONT
1 stop27h 20m
Frontier
Deal found 5/12![Frontier logo]()
$301
This CheapOair deal was found by Cheapflights users on 5/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/195:43 pm
ONT
- BWI
1 stop15h 51m
Frontier
Mon 6/225:32 pm
BWI
- ONT
1 stop27h 20m
Frontier
Deal found 5/11![Frontier logo]()
$290
This CheapOair deal was found by Cheapflights users on 5/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/305:43 pm
ONT
- BWI
1 stop15h 51m
Frontier
Tue 8/44:29 pm
BWI
- ONT
1 stop28h 20m
Frontier
Deal found 5/12![Frontier logo]()
$280
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 May 16, 2026.
Search for one-way flight options from Ontario to Baltimore. Find affordable one-way fares based on user searches. Data last updated May 16, 2026.
This iWofly deal was found by Cheapflights users on 5/12. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/28:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Deal found 5/12![Frontier logo]()
$107
This Frontier deal was found by Cheapflights users on 5/12. 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.
Wed 6/106:47 pm
ONT
- BWI
1 stop13h 49m
Frontier
Deal found 5/12![Frontier logo]()
$111
This CheapOair deal was found by Cheapflights users on 5/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/38:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Deal found 5/12![Frontier logo]()
$116
This Kiwi.com deal was found by Cheapflights users on 5/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1210:49 am
ONT
- BWI
2 stops25h 45m
Frontier
Deal found 5/14![Frontier logo]()
$118
This Kiwi.com deal was found by Cheapflights users on 5/13. 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.
Wed 8/56:00 am
ONT
- BWI
2 stops30h 34m
Frontier
Deal found 5/13![Frontier logo]()
$120
This Expedia deal was found by Cheapflights users on 5/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/48:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Deal found 5/12![Frontier logo]()
$125
This Kiwi.com deal was found by Cheapflights users on 5/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/143:40 pm
ONT
- BWI
2 stops23h 53m
Frontier
Deal found 5/15![Frontier logo]()
$126
This CheapOair deal was found by Cheapflights users on 5/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/185:43 pm
ONT
- BWI
1 stop23h 54m
Frontier
Deal found 5/11![Frontier logo]()
$131
This Mytrip deal was found by Cheapflights users on 5/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/75:43 pm
ONT
- BWI
1 stop23h 53m
Frontier
Deal found 5/12![Frontier logo]()
$135
This CheapOair deal was found by Cheapflights users on 5/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/235:43 pm
ONT
- BWI
1 stop15h 51m
Frontier
Deal found 5/12![Frontier logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 5/11. 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 6/86:00 am
ONT
- BWI
2 stops30h 25m
Frontier
Deal found 5/11![Frontier logo]()
$139
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 May 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $230 (Expedia) |
One-way from | $107 (iWofly) |
Popular in | June |
Cheapest in | September |
Average price | $429 |
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 May 16, 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
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Tue 7/14
9:40 pm-5:30 am
Nonstop4h 50m
Baltimore/Washington
Wed 7/29
9:50 am-12:05 pm
Nonstop5h 15m
$395
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Thu 9/24
11:00 am-10:40 pm
1 stop8h 40m
Baltimore/Washington
Mon 9/28
5:20 pm-9:45 pm
1 stop7h 25m
$401
Quickest round-trip
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Wed 6/3
9:55 pm-5:40 am
Nonstop4h 45m
Baltimore/Washington
Tue 6/30
9:50 am-12:05 pm
Nonstop5h 15m
$407
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Wed 6/3
11:55 pm-12:20 pm
2 stops9h 25m
Baltimore/Washington
Tue 6/9
6:50 am-12:55 pm
2 stops9h 05m
$411
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Thu 8/27
5:15 am-7:35 pm
2 stops11h 20m
Baltimore/Washington
Sun 8/30
7:55 am-11:45 am
1 stop6h 50m
$475
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Sat 5/30
7:05 am-5:24 pm
1 stop7h 19m
Baltimore/Washington
Sat 6/6
7:00 am-12:19 pm
1 stop8h 19m
$479
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Wed 9/9
4:45 pm-6:35 am
2 stops10h 50m
Baltimore/Washington
Sun 9/13
11:10 am-5:15 pm
2 stops9h 05m
$484
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Fri 6/5
9:40 pm-5:30 am
Nonstop4h 50m
Baltimore/Washington
Tue 6/9
9:50 am-12:05 pm
Nonstop5h 15m
$487
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Tue 9/8
7:10 am-3:34 pm
1 stop29h 24m
Baltimore/Washington
Tue 9/15
7:50 am-2:18 pm
1 stop9h 28m
$500
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Sat 5/30
10:00 pm-9:23 am
1 stop8h 23m
Baltimore/Washington
Tue 6/2
11:50 am-6:36 pm
1 stop9h 46m
$547
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 May.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| 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
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How far ahead should I book a flight from Ontario to Baltimore?
The best time to book flights from Ontario to Baltimore is 49 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, September is the cheapest month in which you can book a flight from Ontario to Baltimore (average of $347). Flying from Ontario to Baltimore in June is currently the most expensive (average of $544). 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 May 16, 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.
What’s the top layover airport for flights from Ontario to Baltimore?
Share of 1-stop round-trip flights from Ontario to Baltimore chosen by Cheapflights users in the past 12 months, using the same layover each way.
Houston (IAH) – chosen by Cheapflights users on 67% of 1-stop itineraries from Ontario to Baltimore on Cheapflights.
What’s the cheapest layover airport for flights from Ontario to Baltimore?
Average round-trip fare for 1-stop flights from Ontario to Baltimore, chosen by Cheapflights users in the past 12 months, with the same layover each way.
Houston (IAH) is the most affordable 1-stop option, with an average round-trip price of $258.
What’s the fastest layover option from Ontario to Baltimore?
Shortest average travel time for 1-stop one-way flights from Ontario to Baltimore, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.
Flights via Dallas (DFW) have the shortest average one-way travel time for 1-stop routes: 8h 13m.
Which airport typically offers the quickest layover for flights from Ontario to Baltimore?
Average layover duration for 1-stop one-way flights from Ontario to Baltimore, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.
Flights via Dallas (DFW) offer the fastest connection on this route, with an average layover time of 2h 37m.
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 May 16, 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.
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Boarding
8.1
Food
7.0
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
8.0
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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Complete your trip
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Search flights from Ontario to Baltimore by cabin class
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Ontario and Baltimore flights
Browse other Ontario and Baltimore flight options. Last updated on May 16, 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 May 16, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 5 airlines flying from Ontario to Baltimore
Discover the top 5 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 May 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$128 | Average$356 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$136 | Average$290 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$256 | Average$393 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$339 | Average$483 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$351 | Average$544 | FlexibilityNo cancel fee | On-time71% |