$84+ 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 7/7. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Jul 17 — Jul 241
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 June 17, 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 June 17, 2026.
This Travelocity deal was found by Cheapflights users on 6/16. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/119:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Wed 7/224:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/16![Frontier logo]()
$242
This Booking.com deal was found by Cheapflights users on 6/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/69:36 am
ONT
- BWI
1 stop8h 03m
Frontier
Fri 8/144:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/17![Frontier logo]()
$243
This Booking.com deal was found by Cheapflights users on 6/16. 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.
Fri 7/109:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Mon 7/134:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/16![Frontier logo]()
$244
This Expedia deal was found by Cheapflights users on 6/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/159:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Wed 7/224:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/17![Frontier logo]()
$246
This Travelocity deal was found by Cheapflights users on 6/16. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/229:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Mon 7/274:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/16![Frontier logo]()
$249
This Travelocity deal was found by Cheapflights users on 6/16. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/119:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Tue 7/144:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/16![Frontier logo]()
$252
This Booking.com deal was found by Cheapflights users on 6/16. 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 7/169:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Tue 7/214:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/16![Frontier logo]()
$253
This Booking.com deal was found by Cheapflights users on 6/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/195:43 pm
ONT
- BWI
1 stop23h 54m
Frontier
Tue 8/254:29 pm
BWI
- ONT
1 stop28h 23m
Frontier
Deal found 6/17![Frontier logo]()
$258
This CheapOair deal was found by Cheapflights users on 6/17. 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 7/299:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Sat 8/154:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/17![Frontier logo]()
$259
This CheapOair deal was found by Cheapflights users on 6/17. 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.
Sat 7/119:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Sat 7/184:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/17![Frontier logo]()
$262
This Trip.com deal was found by Cheapflights users on 6/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1610:49 am
ONT
- DCA
1 stop8h 10m
Frontier
Sun 7/267:00 am
DCA
- ONT
1 stop30h 04m
Frontier
Deal found 6/16![Frontier logo]()
$266
This Trip.com deal was found by Cheapflights users on 6/12. 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.
Sat 7/118:17 am
ONT
- IAD
1 stop9h 55m
Frontier
Sat 7/189:57 pm
IAD
- ONT
1 stop13h 40m
Frontier
Deal found 6/12![Frontier logo]()
$268
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 June 17, 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 June 17, 2026.
This United Airlines deal was found by Cheapflights users on 6/12. 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.
Thu 9/177:13 pm
ONT
- IAD
1 stop8h 47m
United Airlines
Mon 9/215:48 pm
IAD
- ONT
1 stop8h 11m
United Airlines
Deal found 6/12![United Airlines logo]()
$351
This Delta deal was found by Cheapflights users on 6/15. 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.
Mon 8/1710:00 pm
ONT
- PHL
1 stop8h 38m
Delta
Thu 8/273:58 pm
PHL
- ONT
1 stop8h 54m
Delta
Deal found 6/15![Delta logo]()
$359
This Southwest deal was found by Cheapflights users on 6/14. 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 9/2412:25 pm
ONT
- BWI
1 stop8h 00m
Southwest
Thu 10/110:05 am
BWI
- ONT
1 stop8h 15m
Southwest
Deal found 6/14![Southwest logo]()
$371
This Alaska Airlines deal was found by Cheapflights users on 6/16. 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.
Tue 11/104:09 pm
ONT
- PHL
1 stop10h 24m
Alaska Airlines
Mon 11/167:00 am
PHL
- ONT
1 stop11h 15m
Alaska Airlines
Deal found 6/16![Alaska Airlines logo]()
$380
This American Airlines deal was found by Cheapflights users on 6/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/227:05 am
ONT
- SBY
2 stops12h 53m
American Airlines
Sat 8/296:41 am
SBY
- ONT
2 stops10h 12m
American Airlines
Deal found 6/14![American Airlines logo]()
$653
This United Airlines deal was found by Cheapflights users on 6/13. 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.
Fri 9/187:00 am
ONT
- IAD
1 stop7h 37m
United Airlines
Mon 9/215:48 pm
IAD
- ONT
1 stop8h 11m
United Airlines
Deal found 6/13![United Airlines logo]()
$364
This Alaska Airlines deal was found by Cheapflights users on 6/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/303:14 pm
ONT
- PHL
1 stop11h 26m
Alaska Airlines
Wed 10/74:06 pm
PHL
- ONT
1 stop10h 47m
Alaska Airlines
Deal found 6/15![Alaska Airlines logo]()
$380
This Southwest deal was found by Cheapflights users on 6/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/44:45 pm
ONT
- BWI
2 stops10h 50m
Southwest
Tue 8/116:30 am
BWI
- ONT
2 stops9h 00m
Southwest
Deal found 6/14![Southwest logo]()
$381
This Delta deal was found by Cheapflights users on 6/16. 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 7/1310:00 pm
ONT
- DCA
1 stop8h 16m
Delta
Wed 7/2912:27 pm
DCA
- ONT
1 stop9h 03m
Delta
Deal found 6/16![Delta logo]()
$390
This Southwest deal was found by Cheapflights users on 6/14. 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.
Mon 8/178:30 am
ONT
- PHL
2 stops9h 35m
Southwest
Thu 8/274:05 pm
PHL
- ONT
2 stops8h 40m
Southwest
Deal found 6/14![Southwest logo]()
$391
This Delta deal was found by Cheapflights users on 6/14. 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.
Sun 10/1811:55 am
ONT
- IAD
1 stop8h 56m
Delta
Sat 10/247:15 am
IAD
- ONT
1 stop8h 15m
Delta
Deal found 6/14![Delta logo]()
$395
This Southwest deal was found by Cheapflights users on 6/17. 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.
Wed 8/59:40 am
ONT
- PHL
2 stops9h 10m
Southwest
Sun 8/95:00 am
PHL
- ONT
2 stops9h 35m
Southwest
Deal found 6/17![Southwest logo]()
$395
This United Airlines deal was found by Cheapflights users on 6/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/75:45 am
ONT
- DCA
1 stop9h 46m
United Airlines
Tue 8/43:30 pm
DCA
- ONT
1 stop10h 21m
United Airlines
Deal found 6/16![United Airlines logo]()
$441
This Delta deal was found by Cheapflights users on 6/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1010:00 pm
ONT
- BWI
1 stop9h 57m
Delta
Tue 8/187:39 am
BWI
- ONT
1 stop7h 37m
Delta
Deal found 6/17![Delta logo]()
$411
This Alaska Airlines deal was found by Cheapflights users on 6/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/32:14 pm
ONT
- PHL
1 stop12h 26m
Alaska Airlines
Wed 10/74:06 pm
PHL
- ONT
1 stop10h 47m
Alaska Airlines
Deal found 6/15![Alaska Airlines logo]()
$457
This United Airlines deal was found by Cheapflights users on 6/12. 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.
Tue 8/257:00 am
ONT
- IAD
1 stop7h 37m
United Airlines
Wed 8/262:43 pm
IAD
- ONT
1 stop9h 10m
United Airlines
Deal found 6/12![United Airlines logo]()
$441
This Southwest deal was found by Cheapflights users on 6/17. 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.
Wed 9/96:50 am
ONT
- BWI
1 stop8h 30m
Southwest
Mon 9/1410:05 am
BWI
- ONT
1 stop6h 55m
Southwest
Deal found 6/17![Southwest logo]()
$404
This Alaska Airlines deal was found by Cheapflights users on 6/16. 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.
Fri 11/134:09 pm
ONT
- BWI
1 stop10h 31m
Alaska Airlines
Mon 11/167:00 am
BWI
- ONT
1 stop11h 15m
Alaska Airlines
Deal found 6/16![Alaska Airlines logo]()
$464
This Delta deal was found by Cheapflights users on 6/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/47:05 am
ONT
- IAD
1 stop9h 53m
Delta
Thu 7/96:00 am
IAD
- ONT
1 stop7h 38m
Delta
Deal found 6/17![Delta logo]()
$435
This Southwest deal was found by Cheapflights users on 6/17. 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.
Thu 8/65:40 am
ONT
- BWI
2 stops8h 35m
Southwest
Wed 8/2612:15 pm
BWI
- ONT
1 stop9h 40m
Southwest
Deal found 6/17![Southwest logo]()
$409
This United Airlines deal was found by Cheapflights users on 6/13. 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.
Fri 8/216:00 am
ONT
- IAD
1 stop9h 59m
United Airlines
Mon 8/243:40 pm
IAD
- ONT
1 stop9h 55m
United Airlines
Deal found 6/13![United Airlines logo]()
$461
This Alaska Airlines deal was found by Cheapflights users on 6/14. 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.
Thu 10/156:02 am
ONT
- PHL
1 stop20h 38m
Alaska Airlines
Tue 10/274:06 pm
PHL
- ONT
1 stop10h 47m
Alaska Airlines
Deal found 6/14![Alaska Airlines logo]()
$467
This Delta deal was found by Cheapflights users on 6/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/201:06 pm
ONT
- IAD
1 stop7h 33m
Delta
Mon 8/247:00 am
IAD
- ONT
1 stop8h 16m
Delta
Deal found 6/17![Delta logo]()
$465
This United Airlines deal was found by Cheapflights users on 6/13. 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 7/281:50 pm
ONT
- PHL
2 stops12h 41m
United Airlines
Mon 8/106:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 6/13![United Airlines logo]()
$470
This American Airlines deal was found by Cheapflights users on 6/14. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/216:15 am
ONT
- SBY
2 stops12h 02m
American Airlines
Sat 8/299:45 am
SBY
- ONT
2 stops12h 13m
American Airlines
Deal found 6/14![American Airlines logo]()
$691
This Southwest deal was found by Cheapflights users on 6/15. 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.
Mon 8/105:15 am
ONT
- BWI
2 stops11h 20m
Southwest
Thu 8/137:10 am
BWI
- ONT
2 stops10h 55m
Southwest
Deal found 6/15![Southwest logo]()
$447
This United Airlines deal was found by Cheapflights users on 6/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/141:50 pm
ONT
- PHL
2 stops12h 41m
United Airlines
Tue 7/216:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 6/14![United Airlines logo]()
$470
This American Airlines deal was found by Cheapflights users on 6/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/2310:10 pm
ONT
- SBY
1 stop9h 48m
American Airlines
Mon 7/274:33 pm
SBY
- ONT
1 stop9h 01m
American Airlines
Deal found 6/16![American Airlines logo]()
$702
This Delta deal was found by Cheapflights users on 6/14. 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 9/412:00 pm
ONT
- IAD
1 stop9h 34m
Delta
Mon 9/76:00 am
IAD
- ONT
1 stop7h 42m
Delta
Deal found 6/14![Delta logo]()
$493
This Southwest deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/135:15 am
ONT
- DCA
2 stops7h 30m
Southwest
Tue 7/216:35 pm
DCA
- ONT
1 stop7h 00m
Southwest
Deal found 6/12![Southwest logo]()
$456
Last-minute flights from Ontario to MarylandDiscover last-minute flight deals from Ontario to Maryland. Data last updated June 17, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Maryland. Data last updated June 17, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 6/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/83:40 pm
ONT
- IAD
1 stop13h 40m
Frontier
Tue 7/149:50 am
IAD
- ONT
2 stops17h 00m
Frontier
Deal found 6/15![Frontier logo]()
$278
This Booking.com deal was found by Cheapflights users on 6/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/109:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Tue 7/144:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/17![Frontier logo]()
$244
This Super.com deal was found by Cheapflights users on 6/17. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/109:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Mon 7/134:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/17![Frontier logo]()
$254
This Travelocity deal was found by Cheapflights users on 6/16. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/119:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Wed 7/224:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/16![Frontier logo]()
$242
This Travelocity deal was found by Cheapflights users on 6/16. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/119:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Tue 7/144:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/16![Frontier logo]()
$252
This CheapOair deal was found by Cheapflights users on 6/17. 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.
Sat 7/119:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Sat 7/184:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/17![Frontier logo]()
$262
This Expedia deal was found by Cheapflights users on 6/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/159:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Wed 7/224:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/17![Frontier logo]()
$246
This Booking.com deal was found by Cheapflights users on 6/16. 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 7/169:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Tue 7/214:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/16![Frontier logo]()
$253
This Trip.com deal was found by Cheapflights users on 6/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/1610:49 am
ONT
- DCA
1 stop8h 10m
Frontier
Sun 7/267:00 am
DCA
- ONT
1 stop30h 04m
Frontier
Deal found 6/16![Frontier logo]()
$266
This Kiwi.com deal was found by Cheapflights users on 6/16. 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 7/211:38 pm
ONT
- IAD
1 stop15h 42m
Frontier
Tue 7/289:50 am
IAD
- ONT
2 stops17h 00m
Frontier
Deal found 6/16![Frontier logo]()
$284
This Travelocity deal was found by Cheapflights users on 6/16. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/229:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Mon 7/274:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/16![Frontier logo]()
$249
This CheapOair deal was found by Cheapflights users on 6/17. 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 7/299:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Sat 8/154:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 6/17![Frontier logo]()
$259
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 June 17, 2026.
Search for one-way flight options from Ontario to Maryland. Find affordable one-way fares based on user searches. Data last updated June 17, 2026.
This Trip.com deal was found by Cheapflights users on 6/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/73:40 pm
ONT
- IAD
1 stop13h 40m
Frontier
Deal found 6/15![Frontier logo]()
$84
This Trip.com deal was found by Cheapflights users on 6/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/293:40 pm
ONT
- IAD
1 stop13h 40m
Frontier
Deal found 6/15![Frontier logo]()
$85
This Trip.com deal was found by Cheapflights users on 6/12. 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.
Wed 8/125:08 pm
ONT
- IAD
1 stop12h 12m
Frontier
Deal found 6/12![Frontier logo]()
$97
This Trip.com deal was found by Cheapflights users on 6/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/141:38 pm
ONT
- IAD
1 stop15h 42m
Frontier
Deal found 6/16![Frontier logo]()
$107
This Trip.com deal was found by Cheapflights users on 6/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/253:34 pm
ONT
- IAD
1 stop13h 16m
Frontier
Deal found 6/15![Frontier logo]()
$112
This Trip.com deal was found by Cheapflights users on 6/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/283:40 pm
ONT
- IAD
1 stop13h 40m
Frontier
Deal found 6/16![Frontier logo]()
$114
This Trip.com deal was found by Cheapflights users on 6/13. 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.
Wed 7/81:38 pm
ONT
- IAD
1 stop15h 42m
Frontier
Deal found 6/13![Frontier logo]()
$116
This Super.com deal was found by Cheapflights users on 6/17. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/78:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 6/17![Frontier logo]()
$118
This Trip.com deal was found by Cheapflights users on 6/13. 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 8/43:40 pm
ONT
- IAD
1 stop13h 40m
Frontier
Deal found 6/13![Frontier logo]()
$118
This Super.com deal was found by Cheapflights users on 6/17. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/109:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Deal found 6/17![Frontier logo]()
$119
This Super.com deal was found by Cheapflights users on 6/17. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:00 am
ONT
- DCA
1 stop7h 57m
Frontier
Deal found 6/17![Frontier logo]()
$119
This Frontier deal was found by Cheapflights users on 6/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/318:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 6/17![Frontier logo]()
$120
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 June 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $242 (Travelocity) |
One-way from | $84 (Trip.com) |
Popular in | March |
Cheapest in | August |
Average price | $425 |
Good round-trip deal | $503 or less |
Good one-way deal | $188 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 June 17, 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
OntarioWashington, D.C.
ONT - IAD
ONTIAD
Ontario
Thu 9/17
7:13 pm-7:00 am
1 stop8h 47m
Washington, D.C. Dulles Intl
Mon 9/21
5:48 pm-10:59 pm
1 stop8h 11m
$351
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 8/17
10:00 pm-9:38 am
1 stop8h 38m
Philadelphia
Thu 8/27
3:58 pm-9:52 pm
1 stop8h 54m
$359
OntarioWashington, D.C.
ONT - IAD
ONTIAD
Ontario
Fri 9/18
7:00 am-5:37 pm
1 stop7h 37m
Washington, D.C. Dulles Intl
Mon 9/21
5:48 pm-10:59 pm
1 stop8h 11m
$364
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Thu 9/24
12:25 pm-11:25 pm
1 stop8h 00m
Baltimore/Washington
Thu 10/1
10:05 am-3:20 pm
1 stop8h 15m
$371
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 11/10
4:09 pm-5:33 am
1 stop10h 24m
Philadelphia
Mon 11/16
7:00 am-3:15 pm
1 stop11h 15m
$380
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Wed 9/30
3:14 pm-5:40 am
1 stop11h 26m
Philadelphia
Wed 10/7
4:06 pm-11:53 pm
1 stop10h 47m
$380
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Tue 8/4
4:45 pm-6:35 am
2 stops10h 50m
Baltimore/Washington
Tue 8/11
6:30 am-12:30 pm
2 stops9h 00m
$381
OntarioWashington, D.C.
ONT - DCA
ONTDCA
Ontario
Mon 7/13
10:00 pm-9:16 am
1 stop8h 16m
Washington, D.C. Reagan-National
Wed 7/29
12:27 pm-6:30 pm
1 stop9h 03m
$390
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 8/17
8:30 am-9:05 pm
2 stops9h 35m
Philadelphia
Thu 8/27
4:05 pm-9:45 pm
2 stops8h 40m
$391
OntarioWashington, D.C.
ONT - IAD
ONTIAD
Ontario
Sun 10/18
11:55 am-11:51 pm
1 stop8h 56m
Washington, D.C. Dulles Intl
Sat 10/24
7:15 am-12:30 pm
1 stop8h 15m
$395
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-IAD
ONT-PHL
ONT-BWI
ONT-SBY
ONT-DCA
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-IAD
ONT-PHL
ONT-BWI
ONT-SBY
What is the cheapest month to book a flight from Ontario to Maryland?
Currently, September is the cheapest month in which you can book a flight from Ontario to Maryland (average of $98). Flying from Ontario to Maryland in November is currently the most expensive (average of $326). 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 June 17, 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 June 17, 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).
How much does it cost to fly round-trip from Ontario to Maryland?
How far ahead should I book a flight from Ontario to Maryland?
The best time to book flights from Ontario to Maryland is 44 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.
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 June 17, 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
Crew
8.6
Food
7.0
Overall
7.9
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Crew
8.6
Food
7.0
Overall
7.9
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Crew
8.6
Food
7.0
Overall
7.9
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Crew
8.6
Food
7.0
Overall
7.9
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Crew
8.6
Food
7.0
Overall
7.9
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Comfort
8.0
Crew
8.6
Food
7.0
Overall
7.9
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
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
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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 June 17, 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 5 airlines flying from Ontario to Maryland
Discover the top 5 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 June 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$183 | Average$441 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$202 | Average$290 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$256 | Average$393 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$339 | Average$488 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$434 | Average$544 | FlexibilityNo cancel fee | On-time71% |