$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 8/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Jun 19 — Jun 261
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 20, 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 20, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/19. 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 8/106:47 pm
ONT
- BWI
1 stop15h 53m
Frontier
Mon 8/249:32 pm
BWI
- ONT
2 stops29h 17m
Frontier
Deal found 5/19![Frontier logo]()
$314
This CheapOair deal was found by Cheapflights users on 5/18. 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 8/55:43 pm
ONT
- BWI
1 stop23h 53m
Frontier
Tue 8/114:29 pm
BWI
- ONT
1 stop28h 20m
Frontier
Deal found 5/18![Frontier logo]()
$320
This Kiwi.com deal was found by Cheapflights users on 5/19. 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 8/126:47 pm
ONT
- BWI
1 stop15h 53m
Frontier
Mon 8/249:32 pm
BWI
- ONT
2 stops29h 17m
Frontier
Deal found 5/19![Frontier logo]()
$325
This Expedia deal was found by Cheapflights users on 5/18. 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 8/55:43 pm
ONT
- BWI
1 stop23h 53m
Frontier
Sun 8/94:29 pm
BWI
- ONT
1 stop28h 20m
Frontier
Deal found 5/18![Frontier logo]()
$330
This CheapOair deal was found by Cheapflights users on 5/18. 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 8/55:43 pm
ONT
- BWI
1 stop23h 53m
Frontier
Mon 8/105:32 pm
BWI
- ONT
1 stop27h 17m
Frontier
Deal found 5/18![Frontier logo]()
$340
This Kiwi.com deal was found by Cheapflights users on 5/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/35:43 pm
ONT
- BWI
2 stops34h 53m
Frontier
Tue 8/114:29 pm
BWI
- ONT
1 stop28h 20m
Frontier
Deal found 5/17![Frontier logo]()
$345
This Orbitz deal was found by Cheapflights users on 5/19. 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.
Thu 8/135:43 pm
ONT
- BWI
1 stop23h 53m
Frontier
Thu 8/204:29 pm
BWI
- ONT
1 stop28h 23m
Frontier
Deal found 5/19![Frontier logo]()
$350
This CheapOair deal was found by Cheapflights users on 5/19. 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 7/75:43 pm
ONT
- BWI
1 stop23h 53m
Frontier
Tue 7/214:29 pm
BWI
- ONT
1 stop28h 20m
Frontier
Deal found 5/19![Frontier logo]()
$360
This Booking.com deal was found by Cheapflights users on 5/16. 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 8/135:43 pm
ONT
- BWI
1 stop23h 53m
Frontier
Wed 8/195:19 pm
BWI
- ONT
1 stop27h 33m
Frontier
Deal found 5/16![Frontier logo]()
$363
This Kiwi.com deal was found by Cheapflights users on 5/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/76:47 pm
ONT
- BWI
1 stop15h 53m
Frontier
Sat 8/152:25 pm
BWI
- ONT
2 stops12h 25m
Frontier
Deal found 5/16![Frontier logo]()
$367
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/25:43 pm
ONT
- BWI
1 stop23h 54m
Frontier
Mon 7/65:32 pm
BWI
- ONT
1 stop27h 17m
Frontier
Deal found 5/15![Frontier logo]()
$370
This Kiwi.com deal was found by Cheapflights users on 5/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/46:47 pm
ONT
- BWI
1 stop15h 53m
Frontier
Sat 8/152:25 pm
BWI
- ONT
2 stops12h 25m
Frontier
Deal found 5/16![Frontier logo]()
$372
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 20, 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 20, 2026.
This Southwest deal was found by Cheapflights users on 5/19. 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 7/611:55 pm
ONT
- BWI
1 stop8h 15m
Southwest
Tue 7/149:50 am
BWI
- ONT
Nonstop5h 15m
Southwest
Deal found 5/19![Southwest logo]()
$471
This Delta deal was found by Cheapflights users on 5/19. 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 7/910:00 pm
ONT
- BWI
1 stop8h 24m
Delta
Wed 7/155:40 am
BWI
- ONT
1 stop7h 58m
Delta
Deal found 5/19![Delta logo]()
$493
This Southwest deal was found by Cheapflights users on 5/17. 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.
Fri 10/2311:55 pm
ONT
- BWI
1 stop9h 00m
Southwest
Mon 10/261:05 pm
BWI
- ONT
2 stops9h 45m
Southwest
Deal found 5/17![Southwest logo]()
$479
This Delta deal was found by Cheapflights users on 5/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/1311:50 am
ONT
- BWI
1 stop9h 50m
Delta
Tue 6/235:40 am
BWI
- ONT
1 stop8h 00m
Delta
Deal found 5/16![Delta logo]()
$513
This Delta deal was found by Cheapflights users on 5/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/27:05 am
ONT
- BWI
1 stop7h 19m
Delta
Wed 6/36:00 am
BWI
- ONT
1 stop7h 57m
Delta
Deal found 5/16![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 6/113:40 pm
ONT
- BWI
2 stops10h 35m
Southwest
Mon 6/154:40 pm
BWI
- ONT
1 stop8h 55m
Southwest
Deal found 5/15![Southwest logo]()
$552
This Delta deal was found by Cheapflights users on 5/19. 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 5/3012:07 pm
ONT
- BWI
1 stop9h 50m
Delta
Wed 6/311:50 am
BWI
- ONT
1 stop9h 46m
Delta
Deal found 5/19![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.
Sat 5/3011:55 pm
ONT
- BWI
2 stops8h 45m
Southwest
Wed 6/311:40 am
BWI
- ONT
2 stops10h 15m
Southwest
Deal found 5/15![Southwest logo]()
$557
This Delta deal was found by Cheapflights users on 5/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/1311:50 am
ONT
- BWI
1 stop9h 50m
Delta
Mon 6/297:05 am
BWI
- ONT
1 stop8h 05m
Delta
Deal found 5/16![Delta logo]()
$563
This Southwest deal was found by Cheapflights users on 5/17. 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.
Tue 6/165:15 am
ONT
- BWI
2 stops9h 40m
Southwest
Sat 7/113:00 pm
BWI
- ONT
2 stops10h 40m
Southwest
Deal found 5/17![Southwest logo]()
$583
This Delta deal was found by Cheapflights users on 5/19. 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 7/910:00 pm
ONT
- BWI
1 stop8h 24m
Delta
Sat 7/116:00 am
BWI
- ONT
1 stop7h 38m
Delta
Deal found 5/19![Delta logo]()
$579
This Delta deal was found by Cheapflights users on 5/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/117:05 am
ONT
- BWI
1 stop8h 15m
Delta
Mon 6/295:40 am
BWI
- ONT
1 stop8h 00m
Delta
Deal found 5/16![Delta logo]()
$579
Last-minute flights from Ontario to BaltimoreDiscover last-minute flight deals from Ontario to Baltimore. Data last updated May 20, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Baltimore. Data last updated May 20, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 5/16. 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 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
Sat 6/65:34 pm
BWI
- ONT
1 stop16h 34m
Frontier
Deal found 5/16![Frontier logo]()
$400
This CheapOair 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 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
Wed 8/265:19 pm
BWI
- ONT
1 stop27h 33m
Frontier
Deal found 5/15![Frontier logo]()
$340
This CheapOair deal was found by Cheapflights users on 5/19. 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
Wed 6/105:32 pm
BWI
- ONT
1 stop27h 20m
Frontier
Deal found 5/19![Frontier logo]()
$380
This Gotogate deal was found by Cheapflights users on 5/19. 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 Gotogate 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
Mon 6/85:17 pm
BWI
- ONT
1 stop27h 19m
Frontier
Deal found 5/19![Frontier logo]()
$419
This CheapOair deal was found by Cheapflights users on 5/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/96:43 pm
ONT
- BWI
1 stop14h 51m
Frontier
Wed 9/25:19 pm
BWI
- ONT
1 stop27h 33m
Frontier
Deal found 5/16![Frontier logo]()
$390
This Southwest deal was found by Cheapflights users on 5/19. 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 6/1011:55 pm
ONT
- BWI
1 stop8h 50m
Southwest
Tue 6/163:45 pm
BWI
- ONT
1 stop7h 35m
Southwest
Deal found 5/19![Southwest logo]()
$405
This CheapOair deal was found by Cheapflights users on 5/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/175:43 pm
ONT
- BWI
1 stop24h 05m
Frontier
Mon 6/225:32 pm
BWI
- ONT
1 stop27h 20m
Frontier
Deal found 5/17![Frontier logo]()
$420
This CheapOair 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 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 7/74:29 pm
BWI
- ONT
1 stop28h 20m
Frontier
Deal found 5/15![Frontier logo]()
$425
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 20, 2026.
Search for one-way flight options from Ontario to Baltimore. Find affordable one-way fares based on user searches. Data last updated May 20, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/20. 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 8/186:00 am
ONT
- BWI
2 stops31h 24m
Frontier
Deal found 5/20![Frontier logo]()
$107
This Kiwi.com deal was found by Cheapflights users on 5/16. 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 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 5/16![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 5/16. 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 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 5/16![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 5/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/296:00 am
ONT
- BWI
2 stops46h 45m
Frontier
Deal found 5/16![Frontier logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 5/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:00 am
ONT
- BWI
2 stops33h 07m
Frontier
Deal found 5/17![Frontier logo]()
$153
This Kiwi.com deal was found by Cheapflights users on 5/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:00 am
ONT
- BWI
2 stops33h 33m
Frontier
Deal found 5/16![Frontier logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 5/18. 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.
Sat 8/155:43 pm
ONT
- BWI
2 stops39h 32m
Frontier
Deal found 5/18![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 5/18. 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 8/1010:49 am
ONT
- BWI
2 stops41h 47m
Frontier
Deal found 5/18![Frontier logo]()
$161
This Mytrip deal was found by Cheapflights users on 5/17. 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 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 5/17![Frontier logo]()
$164
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 20, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $314 (Kiwi.com) |
One-way from | $107 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $435 |
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 20, 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
Mon 7/6
11:55 pm-11:10 am
1 stop8h 15m
Baltimore/Washington
Tue 7/14
9:50 am-12:05 pm
Nonstop5h 15m
$471
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Fri 10/23
11:55 pm-11:55 am
1 stop9h 00m
Baltimore/Washington
Mon 10/26
1:05 pm-7:50 pm
2 stops9h 45m
$479
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Thu 7/9
10:00 pm-9:24 am
1 stop8h 24m
Baltimore/Washington
Wed 7/15
5:40 am-10:38 am
1 stop7h 58m
$493
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Sat 6/13
11:50 am-12:40 am
1 stop9h 50m
Baltimore/Washington
Tue 6/23
5:40 am-10:40 am
1 stop8h 00m
$513
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Tue 6/2
7:05 am-5:24 pm
1 stop7h 19m
Baltimore/Washington
Wed 6/3
6:00 am-10:57 am
1 stop7h 57m
$547
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Sat 5/30
12:07 pm-12:57 am
1 stop9h 50m
Baltimore/Washington
Wed 6/3
11:50 am-6:36 pm
1 stop9h 46m
$547
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Thu 6/11
3:40 pm-5:15 am
2 stops10h 35m
Baltimore/Washington
Mon 6/15
4:40 pm-10:35 pm
1 stop8h 55m
$552
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Sat 5/30
11:55 pm-11:40 am
2 stops8h 45m
Baltimore/Washington
Wed 6/3
11:40 am-6:55 pm
2 stops10h 15m
$557
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Sat 6/13
11:50 am-12:40 am
1 stop9h 50m
Baltimore/Washington
Mon 6/29
7:05 am-12:10 pm
1 stop8h 05m
$563
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Thu 7/9
10:00 pm-9:24 am
1 stop8h 24m
Baltimore/Washington
Sat 7/11
6:00 am-10:38 am
1 stop7h 38m
$579
Showing 1-10 of 24 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 $545). 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 20, 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 20, 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.
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Boarding
8.1
Overall
7.9
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
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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 May 20, 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 20, 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 20, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$132 | Average$290 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$183 | Average$356 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$256 | Average$388 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$339 | Average$481 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$351 | Average$544 | FlexibilityNo cancel fee | On-time71% |