$128+ 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 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Sep 29 — Oct 61
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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 24 days in advance, depart on a Wednesday or Monday and return on a Thursday
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 August 30, 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 August 30, 2026.
This Frontier deal was found by Cheapflights users on 8/27. 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.
Thu 10/298:03 pm -
1 stop11h 49m
Tue 11/311:07 am -
1 stop8h 31m
Deal found 8/27![Frontier logo]()
$252
This Flightnetwork deal was found by Cheapflights users on 8/27. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:45 pm -
1 stop22h 45m
Wed 9/2312:45 pm -
1 stop8h 31m
Deal found 8/27![Frontier logo]()
$258
This CheapOair deal was found by Cheapflights users on 8/26. 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 9/307:11 pm -
1 stop13h 29m
Sat 10/35:42 pm -
1 stop27h 06m
Deal found 8/26![Frontier logo]()
$262
This Frontier deal was found by Cheapflights users on 8/28. 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 10/27:46 pm -
1 stop12h 54m
Mon 10/51:29 pm -
1 stop8h 10m
Deal found 8/28![Frontier logo]()
$267
This Kiwi.com deal was found by Cheapflights users on 8/26. 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 9/237:11 pm -
1 stop13h 29m
Wed 9/3010:22 am -
2 stops16h 25m
Deal found 8/26![Frontier logo]()
$272
This CheapOair deal was found by Cheapflights users on 8/26. 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 9/187:46 pm -
1 stop12h 54m
Sat 9/195:42 pm -
1 stop27h 06m
Deal found 8/26![Frontier logo]()
$277
This Kiwi.com deal was found by Cheapflights users on 8/26. 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.
Thu 10/158:03 pm -
1 stop11h 55m
Mon 10/199:12 pm -
2 stops29h 38m
Deal found 8/26![Frontier logo]()
$281
This Frontier deal was found by Cheapflights users on 8/27. 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 9/257:46 pm -
1 stop12h 54m
Sun 9/271:29 pm -
1 stop8h 10m
Deal found 8/27![Frontier logo]()
$282
This Frontier deal was found by Cheapflights users on 8/28. 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 9/187:46 pm -
1 stop12h 54m
Fri 9/251:29 pm -
1 stop8h 10m
Deal found 8/28![Frontier logo]()
$283
This Kiwi.com deal was found by Cheapflights users on 8/26. 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 9/167:11 pm -
1 stop13h 29m
Tue 9/2212:45 pm -
2 stops24h 45m
Deal found 8/26![Frontier logo]()
$284
This Frontier deal was found by Cheapflights users on 8/27. 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 10/308:03 pm -
1 stop11h 49m
Tue 11/311:07 am -
1 stop8h 31m
Deal found 8/27![Frontier logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 8/26. 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.
Thu 9/177:46 pm -
1 stop13h 14m
Mon 9/216:22 pm -
2 stops43h 08m
Deal found 8/26![Frontier logo]()
$289
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 August 30, 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 August 30, 2026.
This Alaska Airlines deal was found by Cheapflights users on 8/25. 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 9/223:14 pm -
1 stop12h 16m
Tue 9/297:50 am -
1 stop9h 26m
Deal found 8/25![Alaska Airlines logo]()
$385
This Southwest deal was found by Cheapflights users on 8/28. 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 11/186:25 pm -
1 stop8h 20m
Mon 11/239:20 am -
1 stop10h 20m
Deal found 8/28![Southwest logo]()
$385
This Delta deal was found by Cheapflights users on 8/25. 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 9/57:05 am -
1 stop7h 46m
Sat 9/262:03 pm -
1 stop7h 38m
Deal found 8/25![Delta logo]()
$393
This United Airlines deal was found by Cheapflights users on 8/27. 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.
Tue 10/207:00 am -
1 stop8h 13m
Sat 10/245:29 pm -
1 stop8h 22m
Deal found 8/27![United Airlines logo]()
$495
This Southwest deal was found by Cheapflights users on 8/25. 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 9/168:35 am -
2 stops8h 50m
Tue 9/228:10 am -
2 stops13h 25m
Deal found 8/25![Southwest logo]()
$400
This Delta deal was found by Cheapflights users on 8/27. 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 10/207:07 am -
1 stop7h 20m
Fri 10/234:45 pm -
1 stop8h 09m
Deal found 8/27![Delta logo]()
$447
This United Airlines deal was found by Cheapflights users on 8/26. 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.
Tue 11/171:29 pm -
1 stop6h 39m
Thu 11/268:23 am -
1 stop7h 10m
Deal found 8/26![United Airlines logo]()
$495
This Alaska Airlines deal was found by Cheapflights users on 8/29. 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 9/1510:47 am -
1 stop25h 53m
Sat 9/264:43 pm -
1 stop20h 08m
Deal found 8/29![Alaska Airlines logo]()
$496
This Delta deal was found by Cheapflights users on 8/29. 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 9/57:05 am -
1 stop7h 46m
Mon 9/76:00 am -
1 stop7h 42m
Deal found 8/29![Delta logo]()
$477
This Southwest deal was found by Cheapflights users on 8/30. 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 11/201:20 pm -
1 stop6h 35m
Sat 12/512:35 pm -
1 stop9h 10m
Deal found 8/30![Southwest logo]()
$492
This Delta deal was found by Cheapflights users on 8/29. 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 9/157:05 am -
1 stop7h 21m
Thu 9/2412:02 pm -
1 stop9h 05m
Deal found 8/29![Delta logo]()
$496
This Southwest deal was found by Cheapflights users on 8/30. 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 11/208:35 am -
2 stops7h 20m
Thu 12/33:45 pm -
2 stops8h 55m
Deal found 8/30![Southwest logo]()
$498
Last-minute flights from Ontario to BaltimoreDiscover last-minute flight deals from Ontario to Baltimore. Data last updated August 30, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Baltimore. Data last updated August 30, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/26. 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 9/167:11 pm -
1 stop13h 29m
Tue 9/2212:45 pm -
2 stops24h 45m
Deal found 8/26![Frontier logo]()
$284
This Kiwi.com deal was found by Cheapflights users on 8/26. 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 9/167:11 pm -
1 stop13h 29m
Mon 9/216:22 pm -
2 stops32h 25m
Deal found 8/26![Frontier logo]()
$290
This Flightnetwork deal was found by Cheapflights users on 8/27. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:45 pm -
1 stop22h 45m
Wed 9/2312:45 pm -
1 stop8h 31m
Deal found 8/27![Frontier logo]()
$258
This Kiwi.com deal was found by Cheapflights users on 8/26. 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.
Thu 9/177:46 pm -
1 stop13h 14m
Mon 9/216:22 pm -
2 stops43h 08m
Deal found 8/26![Frontier logo]()
$289
This CheapOair deal was found by Cheapflights users on 8/26. 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 9/187:46 pm -
1 stop12h 54m
Sat 9/195:42 pm -
1 stop27h 06m
Deal found 8/26![Frontier logo]()
$277
This Frontier deal was found by Cheapflights users on 8/28. 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 9/187:46 pm -
1 stop12h 54m
Fri 9/251:29 pm -
1 stop8h 10m
Deal found 8/28![Frontier logo]()
$283
This Frontier deal was found by Cheapflights users on 8/28. 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 9/237:11 pm -
1 stop13h 29m
Sun 9/271:29 pm -
1 stop8h 10m
Deal found 8/28![Frontier logo]()
$267
This Kiwi.com deal was found by Cheapflights users on 8/26. 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 9/237:11 pm -
1 stop13h 29m
Wed 9/3010:22 am -
2 stops16h 25m
Deal found 8/26![Frontier logo]()
$272
This Frontier deal was found by Cheapflights users on 8/27. 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 9/257:46 pm -
1 stop12h 54m
Sun 9/271:29 pm -
1 stop8h 10m
Deal found 8/27![Frontier logo]()
$282
This Frontier deal was found by Cheapflights users on 8/27. 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.
Mon 9/287:46 pm -
1 stop12h 54m
Wed 9/3012:45 pm -
1 stop8h 31m
Deal found 8/27![Frontier logo]()
$252
This CheapOair deal was found by Cheapflights users on 8/26. 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 9/307:11 pm -
1 stop13h 29m
Sat 10/35:42 pm -
1 stop27h 06m
Deal found 8/26![Frontier logo]()
$262
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 August 30, 2026.
Search for one-way flight options from Ontario to Baltimore. Find affordable one-way fares based on user searches. Data last updated August 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/27. 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 10/276:25 am -
2 stops24h 25m
Deal found 8/27![Frontier logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 8/27. 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 9/2911:45 am -
2 stops26h 01m
Deal found 8/27![Frontier logo]()
$129
This Super.com deal was found by Cheapflights users on 8/27. 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 10/17:46 pm -
1 stop13h 14m
Deal found 8/27![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 8/27. 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 9/306:15 am -
2 stops12h 15m
Deal found 8/27![Frontier logo]()
$131
This Frontier deal was found by Cheapflights users on 8/27. 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.
Thu 10/298:03 pm -
1 stop11h 49m
Deal found 8/27![Frontier logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 8/25. 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 9/2311:45 am -
2 stops18h 40m
Deal found 8/25![Frontier logo]()
$135
This Kiwi.com deal was found by Cheapflights users on 8/25. 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 9/2211:45 am -
2 stops20h 55m
Deal found 8/25![Frontier logo]()
$139
This Super.com deal was found by Cheapflights users on 8/25. 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.
Fri 9/257:46 pm -
1 stop12h 54m
Deal found 8/25![Frontier logo]()
$144
This Super.com deal was found by Cheapflights users on 8/26. 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.
Fri 9/186:45 pm -
1 stop22h 45m
Deal found 8/26![Frontier logo]()
$145
This Kiwi.com deal was found by Cheapflights users on 8/25. 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 10/1411:52 am -
2 stops23h 17m
Deal found 8/25![Frontier logo]()
$146
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 August 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $252 (Frontier) |
One-way from | $128 (Kiwi.com) |
Popular in | June |
Cheapest in | February |
Average price | $462 |
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 7,457,451 searches. Data last updated August 30, 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 Ontario - BWI Baltimore/Washington
ONTBWI
Ontario
Tue 9/22
3:14 pm-6:30 am
1 stop12h 16m
Baltimore/Washington
Tue 9/29
7:50 am-2:16 pm
1 stop9h 26m
$385
OntarioBaltimore
ONT Ontario - BWI Baltimore/Washington
ONTBWI
Ontario
Wed 11/18
6:25 pm-5:45 am
1 stop8h 20m
Baltimore/Washington
Mon 11/23
9:20 am-4:40 pm
1 stop10h 20m
$385
OntarioBaltimore
ONT Ontario - BWI Baltimore/Washington
ONTBWI
Ontario
Sat 9/5
7:05 am-5:51 pm
1 stop7h 46m
Baltimore/Washington
Sat 9/26
2:03 pm-6:41 pm
1 stop7h 38m
$393
OntarioBaltimore
ONT Ontario - BWI Baltimore/Washington
ONTBWI
Ontario
Wed 9/16
8:35 am-8:25 pm
2 stops8h 50m
Baltimore/Washington
Tue 9/22
8:10 am-6:35 pm
2 stops13h 25m
$400
OntarioBaltimore
ONT Ontario - BWI Baltimore/Washington
ONTBWI
Ontario
Tue 10/20
7:07 am-5:27 pm
1 stop7h 20m
Baltimore/Washington
Fri 10/23
4:45 pm-9:54 pm
1 stop8h 09m
$447
OntarioBaltimore
ONT Ontario - BWI Baltimore/Washington
ONTBWI
Ontario
Sat 9/5
7:05 am-5:51 pm
1 stop7h 46m
Baltimore/Washington
Mon 9/7
6:00 am-10:42 am
1 stop7h 42m
$477
OntarioBaltimore
ONT Ontario - BWI Baltimore/Washington
ONTBWI
Ontario
Fri 11/20
1:20 pm-10:55 pm
1 stop6h 35m
Baltimore/Washington
Sat 12/5
12:35 pm-6:45 pm
1 stop9h 10m
$492
OntarioBaltimore
ONT Ontario - BWI Baltimore/Washington
ONTBWI
Ontario
Tue 10/20
7:00 am-6:13 pm
1 stop8h 13m
Baltimore/Washington
Sat 10/24
5:29 pm-10:51 pm
1 stop8h 22m
$495
Quickest round-trip
OntarioBaltimore
ONT Ontario - BWI Baltimore/Washington
ONTBWI
Ontario
Tue 11/17
1:29 pm-11:08 pm
1 stop6h 39m
Baltimore/Washington
Thu 11/26
8:23 am-12:33 pm
1 stop7h 10m
$495
OntarioBaltimore
ONT Ontario - BWI Baltimore/Washington
ONTBWI
Ontario
Tue 9/15
10:47 am-3:40 pm
1 stop25h 53m
Baltimore/Washington
Sat 9/26
4:43 pm-9:51 am
1 stop20h 08m
$496
Showing 1-10 of 23 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 August.
| 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 |
- 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
More
How far ahead should I book a flight from Ontario to Baltimore?
The best time to book flights from Ontario to Baltimore is 23 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, February is the cheapest month in which you can book a flight from Ontario to Baltimore (average of $363). Flying from Ontario to Baltimore in June is currently the most expensive (average of $550). 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.
How much does it cost to fly round-trip from Ontario to Baltimore?
Airfare is below average for this route at the moment.
Ontario to Baltimore flights typically cost between $357 and $592 in October.The cheapest round-trip price found within the last 5 days was $252 on Frontier (Oct 29-Nov 2).
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 50% 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 Houston (HOU) offer the fastest connection on this route, with an average layover time of 1h 45m.
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 August 30, 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.
Food
7.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Food
7.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Food
7.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Food
7.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Food
7.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Food
7.0
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Overall
8.0
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Ontario
Popular flights
Alternative routes for Ontario to Baltimore
See prices for flight routes from nearby airports that may be better suited for you.
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 August 30, 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 August 30, 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 7,457,451 searches. Data last updated August 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$183 | Average$441 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$221 | Average$320 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$256 | Average$393 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$351 | Average$474 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$361 | Average$464 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$434 | Average$513 | FlexibilityNo cancel fee | On-time71% |