$83+ Cheap flights from Ontario (ONT) to Maryland
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 4/21. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Apr 15 — Apr 221
Round-trip
1 adult, Economy
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Cheapest flights from Ontario to MarylandExplore the most affordable flight options available from Ontario to Maryland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 16, 2026.
Explore the most affordable flight options available from Ontario to Maryland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 16, 2026.
This Trip.com deal was found by Cheapflights users on 3/11. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Tue 5/128:35 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 3/11![Frontier logo]()
$191
This Trip.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1412:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Sun 4/193:27 pm
PHL
- ONT
1 stop11h 29m
Frontier
Deal found 3/12![Frontier logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Fri 5/18:41 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 3/13![Frontier logo]()
$200
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2112:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Sat 5/28:41 pm
PHL
- ONT
1 stop13h 45m
Frontier
Deal found 3/13![Frontier logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/2412:59 am
ONT
- DCA
1 stop9h 01m
Frontier
Sat 5/96:00 pm
DCA
- ONT
1 stop8h 49m
Frontier
Deal found 3/12![Frontier logo]()
$206
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Sun 5/38:36 pm
PHL
- ONT
1 stop13h 55m
Frontier
Deal found 3/13![Frontier logo]()
$207
This Trip.com deal was found by Cheapflights users on 3/11. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Fri 5/88:35 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 3/11![Frontier logo]()
$208
This Vliegwinkel deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/112:59 am
ONT
- DCA
1 stop9h 01m
Frontier
Sat 5/96:00 pm
DCA
- ONT
1 stop8h 49m
Frontier
Deal found 3/12![Frontier logo]()
$208
This Trip.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Tue 4/218:36 pm
PHL
- ONT
1 stop30h 19m
Frontier
Deal found 3/12![Frontier logo]()
$209
This Frontier deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:44 pm
ONT
- PHL
1 stop8h 06m
Frontier
Wed 5/610:40 am
PHL
- ONT
1 stop8h 04m
Frontier
Deal found 3/15![Frontier logo]()
$210
This Frontier deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/85:18 pm
ONT
- BWI
1 stop13h 16m
Frontier
Tue 4/143:06 pm
BWI
- ONT
1 stop8h 33m
Frontier
Deal found 3/16![Frontier logo]()
$210
This Expedia deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:59 am
ONT
- DCA
1 stop9h 01m
Frontier
Tue 4/281:59 pm
DCA
- ONT
1 stop12h 56m
Frontier
Deal found 3/16![Frontier logo]()
$210
Best flights from Ontario to MarylandDiscover carefully curated flight deals from Ontario to Maryland that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 16, 2026.
Discover carefully curated flight deals from Ontario to Maryland that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 16, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/223:26 pm
ONT
- BWI
1 stop11h 18m
Alaska Airlines
Wed 5/67:04 am
BWI
- ONT
1 stop10h 26m
Alaska Airlines
Deal found 3/16![Alaska Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1611:53 am
ONT
- IAD
1 stop9h 02m
Delta
Mon 4/206:00 am
IAD
- ONT
1 stop8h 36m
Delta
Deal found 3/15![Delta logo]()
$373
This Southwest deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/139:55 pm
ONT
- BWI
Nonstop4h 45m
Southwest
Sat 5/167:20 pm
BWI
- ONT
Nonstop5h 40m
Southwest
Deal found 3/16![Southwest logo]()
$381
This Expedia deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/410:50 am
ONT
- PHL
1 stop15h 47m
Frontier
Sun 6/78:35 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 3/16![Frontier logo]()
$390
This United Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/151:27 pm
ONT
- IAD
1 stop8h 58m
United Airlines
Sat 4/185:26 pm
IAD
- ONT
1 stop8h 05m
United Airlines
Deal found 3/12![United Airlines logo]()
$437
This Alaska Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/296:00 am
ONT
- PHL
1 stop21h 02m
Alaska Airlines
Sat 5/26:58 pm
PHL
- ONT
1 stop17h 47m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$405
This Southwest deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/286:25 am
ONT
- BWI
2 stops9h 10m
Southwest
Mon 6/14:20 pm
BWI
- ONT
2 stops9h 20m
Southwest
Deal found 3/13![Southwest logo]()
$411
This United Airlines deal was found by Cheapflights users on 3/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:49 pm
ONT
- PHL
1 stop10h 26m
United Airlines
Sat 4/258:00 am
PHL
- ONT
2 stops12h 47m
United Airlines
Deal found 3/11![United Airlines logo]()
$442
This Delta deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1710:15 pm
ONT
- DCA
1 stop7h 54m
Delta
Sat 4/2512:00 pm
DCA
- ONT
2 stops12h 00m
Delta
Deal found 3/14![Delta logo]()
$442
This Frontier deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/37:40 pm
ONT
- BWI
1 stop12h 23m
Frontier
Sat 4/184:34 pm
BWI
- ONT
1 stop9h 03m
Frontier
Deal found 3/16![Frontier logo]()
$455
This United Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/296:49 pm
ONT
- PHL
1 stop10h 26m
United Airlines
Sat 5/210:00 am
PHL
- ONT
2 stops13h 36m
United Airlines
Deal found 3/12![United Airlines logo]()
$442
This Alaska Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/26:00 am
ONT
- BWI
1 stop9h 16m
Alaska Airlines
Tue 5/57:04 am
BWI
- ONT
1 stop10h 28m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$443
This Southwest deal was found by Cheapflights users on 3/14. 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.
Wed 5/2010:40 am
ONT
- PHL
1 stop10h 15m
Southwest
Fri 5/222:15 pm
PHL
- ONT
2 stops10h 00m
Southwest
Deal found 3/14![Southwest logo]()
$448
This Delta deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/910:25 pm
ONT
- BWI
1 stop8h 14m
Delta
Wed 4/157:00 am
BWI
- ONT
1 stop7h 36m
Delta
Deal found 3/14![Delta logo]()
$477
This Southwest deal was found by Cheapflights users on 3/14. 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.
Sat 4/1111:55 pm
ONT
- BWI
2 stops8h 45m
Southwest
Tue 4/142:25 pm
BWI
- ONT
2 stops10h 25m
Southwest
Deal found 3/14![Southwest logo]()
$454
This Alaska Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/194:03 pm
ONT
- BWI
1 stop11h 25m
Alaska Airlines
Thu 5/284:17 pm
BWI
- ONT
1 stop10h 39m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$478
This Delta deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/166:00 am
ONT
- DCA
2 stops13h 02m
Delta
Mon 4/2012:25 pm
DCA
- ONT
2 stops14h 19m
Delta
Deal found 3/14![Delta logo]()
$479
This United Airlines deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1411:05 am
ONT
- DCA
1 stop8h 23m
United Airlines
Sat 4/1812:40 pm
DCA
- ONT
2 stops13h 05m
United Airlines
Deal found 3/15![United Airlines logo]()
$482
This Southwest deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/285:15 am
ONT
- DCA
2 stops8h 20m
Southwest
Sun 5/317:15 pm
DCA
- ONT
1 stop7h 55m
Southwest
Deal found 3/14![Southwest logo]()
$454
This Delta deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/135:05 pm
ONT
- PHL
1 stop9h 38m
Delta
Mon 7/206:40 pm
PHL
- ONT
1 stop8h 04m
Delta
Deal found 3/16![Delta logo]()
$497
This United Airlines deal was found by Cheapflights users on 3/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/157:00 am
ONT
- BWI
1 stop7h 33m
United Airlines
Sat 4/186:00 am
BWI
- ONT
2 stops14h 47m
United Airlines
Deal found 3/11![United Airlines logo]()
$497
This Alaska Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/96:00 am
ONT
- IAD
1 stop9h 11m
Alaska Airlines
Mon 4/136:22 pm
IAD
- ONT
2 stops24h 20m
Alaska Airlines
Deal found 3/12![Alaska Airlines logo]()
$518
This Southwest deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/236:25 am
ONT
- PHL
2 stops9h 00m
Southwest
Mon 4/275:40 am
PHL
- ONT
2 stops9h 30m
Southwest
Deal found 3/13![Southwest logo]()
$477
This Delta deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/45:05 pm
ONT
- PHL
1 stop9h 38m
Delta
Mon 9/72:27 pm
PHL
- ONT
1 stop10h 29m
Delta
Deal found 3/16![Delta logo]()
$497
This Alaska Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/206:00 am
ONT
- IAD
1 stop9h 11m
Alaska Airlines
Wed 4/227:10 am
IAD
- ONT
1 stop10h 22m
Alaska Airlines
Deal found 3/13![Alaska Airlines logo]()
$518
This United Airlines deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/201:27 pm
ONT
- IAD
1 stop8h 58m
United Airlines
Thu 4/236:30 am
IAD
- ONT
1 stop8h 50m
United Airlines
Deal found 3/12![United Airlines logo]()
$521
This Southwest deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/2811:55 am
ONT
- DCA
1 stop9h 00m
Southwest
Thu 7/27:30 am
DCA
- ONT
1 stop9h 30m
Southwest
Deal found 3/15![Southwest logo]()
$523
This United Airlines deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/121:18 pm
ONT
- IAD
1 stop7h 14m
United Airlines
Tue 6/162:53 pm
IAD
- ONT
1 stop10h 02m
United Airlines
Deal found 3/15![United Airlines logo]()
$523
This Alaska Airlines deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1210:39 am
ONT
- IAD
1 stop10h 30m
Alaska Airlines
Sun 5/176:00 am
IAD
- ONT
1 stop32h 10m
Alaska Airlines
Deal found 3/14![Alaska Airlines logo]()
$574
This United Airlines deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/56:59 pm
ONT
- BWI
2 stops12h 03m
United Airlines
Thu 5/76:05 am
BWI
- ONT
1 stop9h 17m
United Airlines
Deal found 3/13![United Airlines logo]()
$526
Last-minute flights from Ontario to MarylandDiscover last-minute flight deals from Ontario to Maryland. Data last updated March 16, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Maryland. Data last updated March 16, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/85:18 pm
ONT
- BWI
1 stop13h 16m
Frontier
Tue 4/143:06 pm
BWI
- ONT
1 stop8h 33m
Frontier
Deal found 3/16![Frontier logo]()
$210
This Trip.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Tue 4/218:36 pm
PHL
- ONT
1 stop30h 19m
Frontier
Deal found 3/12![Frontier logo]()
$209
This Trip.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1412:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Sun 4/193:27 pm
PHL
- ONT
1 stop11h 29m
Frontier
Deal found 3/12![Frontier logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 3/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1712:59 am
ONT
- PHL
1 stop25h 36m
Frontier
Sat 4/258:41 pm
PHL
- ONT
1 stop13h 45m
Frontier
Deal found 3/14![Frontier logo]()
$211
This Trip.com deal was found by Cheapflights users on 3/11. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Tue 5/128:35 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 3/11![Frontier logo]()
$191
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Fri 5/18:41 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 3/13![Frontier logo]()
$200
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Sun 5/38:36 pm
PHL
- ONT
1 stop13h 55m
Frontier
Deal found 3/13![Frontier logo]()
$207
This Trip.com deal was found by Cheapflights users on 3/11. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Fri 5/88:35 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 3/11![Frontier logo]()
$208
This Expedia deal was found by Cheapflights users on 3/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2012:59 am
ONT
- DCA
1 stop9h 01m
Frontier
Tue 4/281:59 pm
DCA
- ONT
1 stop12h 56m
Frontier
Deal found 3/16![Frontier logo]()
$210
This Kiwi.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2112:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Sat 5/28:41 pm
PHL
- ONT
1 stop13h 45m
Frontier
Deal found 3/13![Frontier logo]()
$204
This Frontier deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:44 pm
ONT
- PHL
1 stop8h 06m
Frontier
Wed 5/610:40 am
PHL
- ONT
1 stop8h 04m
Frontier
Deal found 3/15![Frontier logo]()
$210
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/2412:59 am
ONT
- DCA
1 stop9h 01m
Frontier
Sat 5/96:00 pm
DCA
- ONT
1 stop8h 49m
Frontier
Deal found 3/12![Frontier logo]()
$206
One-way flights from Ontario to MarylandSearch for one-way flight options from Ontario to Maryland. Find affordable one-way fares based on user searches. Data last updated March 16, 2026.
Search for one-way flight options from Ontario to Maryland. Find affordable one-way fares based on user searches. Data last updated March 16, 2026.
This Trip.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2112:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Deal found 3/12![Frontier logo]()
$83
This Trip.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1412:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Deal found 3/13![Frontier logo]()
$94
This Trip.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:59 am
ONT
- DCA
1 stop18h 00m
Frontier
Deal found 3/12![Frontier logo]()
$94
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2712:59 am
ONT
- PHL
1 stop25h 35m
Frontier
Deal found 3/12![Frontier logo]()
$95
This Trip.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/510:50 am
ONT
- PHL
1 stop15h 47m
Frontier
Deal found 3/13![Frontier logo]()
$98
This Kiwi.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/2412:59 am
ONT
- DCA
1 stop9h 01m
Frontier
Deal found 3/12![Frontier logo]()
$101
This Trip.com deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1412:59 am
ONT
- DCA
1 stop13h 00m
Frontier
Deal found 3/13![Frontier logo]()
$104
This Trip.com deal was found by Cheapflights users on 3/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1912:59 am
ONT
- DCA
1 stop9h 01m
Frontier
Deal found 3/12![Frontier logo]()
$108
This Super.com deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/45:33 pm
ONT
- PHL
1 stop9h 01m
Frontier
Deal found 3/15![Frontier logo]()
$109
This Frontier deal was found by Cheapflights users on 3/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/18:26 am
ONT
- BWI
1 stop8h 43m
Frontier
Deal found 3/15![Frontier logo]()
$110
This Frontier deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/305:43 pm
ONT
- PHL
1 stop8h 51m
Frontier
Deal found 3/13![Frontier logo]()
$110
This Frontier deal was found by Cheapflights users on 3/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1712:59 am
ONT
- DCA
1 stop9h 01m
Frontier
Deal found 3/13![Frontier logo]()
$110
Find flight deals from Ontario to Maryland
Keep the following information in mind while searching for Ontario to Maryland flight deals. Data was last updated March 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $191 (Trip.com) |
One-way from | $83 (Trip.com) |
Popular in | December |
Cheapest in | August |
Average price | $452 |
Good round-trip deal | $375 or less |
Good one-way deal | $191 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Maryland that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 16, 2026.
Use the filters below to find and compare flights from Ontario to Maryland that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Wed 4/22
3:26 pm-5:44 am
1 stop11h 18m
Baltimore/Washington
Wed 5/6
7:04 am-2:30 pm
1 stop10h 26m
$337
OntarioWashington, D.C.
ONT - IAD
ONTIAD
Ontario
Thu 4/16
11:53 am-11:55 pm
1 stop9h 02m
Washington, D.C. Dulles Intl
Mon 4/20
6:00 am-11:36 am
1 stop8h 36m
$373
Quickest round-trip
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Wed 5/13
9:55 pm-5:40 am
Nonstop4h 45m
Baltimore/Washington
Sat 5/16
7:20 pm-10:00 pm
Nonstop5h 40m
$381
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Thu 6/4
10:50 am-5:37 am
1 stop15h 47m
Philadelphia
Sun 6/7
8:35 pm-11:49 pm
1 stop30h 14m
$390
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Wed 4/29
6:00 am-6:02 am
1 stop21h 02m
Philadelphia
Sat 5/2
6:58 pm-9:45 am
1 stop17h 47m
$405
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Thu 5/28
6:25 am-6:35 pm
2 stops9h 10m
Baltimore/Washington
Mon 6/1
4:20 pm-10:40 pm
2 stops9h 20m
$411
OntarioWashington, D.C.
ONT - IAD
ONTIAD
Ontario
Wed 4/15
1:27 pm-1:25 am
1 stop8h 58m
Washington, D.C. Dulles Intl
Sat 4/18
5:26 pm-10:31 pm
1 stop8h 05m
$437
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Wed 4/22
6:49 pm-8:15 am
1 stop10h 26m
Philadelphia
Sat 4/25
8:00 am-5:47 pm
2 stops12h 47m
$442
OntarioWashington, D.C.
ONT - DCA
ONTDCA
Ontario
Fri 4/17
10:15 pm-9:09 am
1 stop7h 54m
Washington, D.C. Reagan-National
Sat 4/25
12:00 pm-9:00 pm
2 stops12h 00m
$442
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Wed 4/29
6:49 pm-8:15 am
1 stop10h 26m
Philadelphia
Sat 5/2
10:00 am-8:36 pm
2 stops13h 36m
$442
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to Maryland
Have a flexible travel schedule? Discover the best time to fly to Maryland from Ontario with our price prediction graph.
ONT-PHL
ONT-BWI
ONT-DCA
ONT-IAD
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 Maryland
ONT-USMD
ONT-PHL
ONT-BWI
ONT-DCA
ONT-IAD
What is the cheapest month to book a flight from Ontario to Maryland?
Currently, August is the cheapest month in which you can book a flight from Ontario to Maryland (average of $93). Flying from Ontario to Maryland in March is currently the most expensive (average of $198). 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 MD?
Find hourly flight availability from Ontario to Maryland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 16, 2026.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Maryland as you normally would.
Weekly flight availability from Ontario to Maryland
Explore weekly flight availability from Ontario to Maryland. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated March 16, 2026.
The most flights from ONT to USMD are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).
Reviews of airlines servicing Maryland
Get insights into the airlines that provide service to Maryland. 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 Maryland. Reviews last updated March 16, 2026.
Read reviews from past customers who have flown Southwest,Delta, andUnited Airlines from Ontario to Maryland. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
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 Maryland. 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 Maryland
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Maryland by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Maryland by cabin class
Find flights from Ontario to Maryland, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Maryland flights
Browse other Ontario and Maryland flight options. Last updated on March 16, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to Maryland flights
Consider these flights traveling from Ontario to Maryland.
Top 6 airlines flying from Ontario to Maryland
Discover the top 6 airlines that operate flights from Ontario to Maryland. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$72 | Average$234 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$136 | Average$252 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$183 | Average$427 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$256 | Average$388 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$311 | Average$544 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$339 | Average$475 | FlexibilityNo cancel fee | On-time63% |