$97+ 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 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Aug 6 — Aug 131
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 July 7, 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 July 7, 2026.
This Frontier deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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.
Sat 8/159:36 am
ONT
- BWI
1 stop7h 58m
Frontier
Sat 8/221:24 pm
BWI
- ONT
1 stop8h 37m
Frontier
Deal found 7/7![Frontier logo]()
$242
This Booking.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 8/139:36 am
ONT
- BWI
1 stop7h 58m
Frontier
Wed 8/191:24 pm
BWI
- ONT
1 stop8h 37m
Frontier
Deal found 7/3![Frontier logo]()
$243
This Frontier deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 8/219:33 am
ONT
- BWI
1 stop8h 04m
Frontier
Wed 8/261:24 pm
BWI
- ONT
1 stop8h 37m
Frontier
Deal found 7/7![Frontier logo]()
$247
This Gotogate deal was found by Cheapflights users on 7/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/309:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Thu 8/64:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 7/5![Frontier logo]()
$248
This Booking.com deal was found by Cheapflights users on 7/5. Clicking the “Pick Dates” 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.
Sat 8/159:36 am
ONT
- BWI
1 stop7h 58m
Frontier
Thu 8/201:24 pm
BWI
- ONT
1 stop21h 08m
Frontier
Deal found 7/5![Frontier logo]()
$249
This Booking.com deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 stop7h 58m
Frontier
Tue 8/114:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 7/7![Frontier logo]()
$250
This Mytrip deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/319:33 am
ONT
- BWI
1 stop8h 04m
Frontier
Sat 9/125:22 pm
BWI
- ONT
1 stop24h 15m
Frontier
Deal found 7/3![Frontier logo]()
$251
This CheapOair deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/59:36 am
ONT
- BWI
1 stop7h 58m
Frontier
Tue 8/114:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 7/7![Frontier logo]()
$252
This Booking.com deal was found by Cheapflights users on 7/4. Clicking the “Pick Dates” 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.
Mon 8/109:36 am
ONT
- BWI
1 stop7h 58m
Frontier
Sun 8/164:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 7/4![Frontier logo]()
$254
This Booking.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 8/129:36 am
ONT
- BWI
1 stop7h 58m
Frontier
Fri 8/144:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 7/3![Frontier logo]()
$255
This CheapOair deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/319:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Thu 8/64:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 7/7![Frontier logo]()
$257
This CheapOair deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 7/223:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Thu 8/68:37 pm
PHL
- ONT
1 stop16h 27m
Frontier
Deal found 7/3![Frontier logo]()
$309
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 July 7, 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 July 7, 2026.
This Delta deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 10/2311:15 pm
ONT
- PHL
1 stop8h 01m
Delta
Tue 11/37:20 am
PHL
- ONT
1 stop8h 02m
Delta
Deal found 7/2![Delta logo]()
$335
This Alaska Airlines deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 9/93:14 pm
ONT
- IAD
1 stop11h 26m
Alaska Airlines
Wed 9/167:00 am
IAD
- ONT
1 stop10h 16m
Alaska Airlines
Deal found 7/7![Alaska Airlines logo]()
$341
This Frontier deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 8/206:00 am
ONT
- DCA
1 stop7h 59m
Frontier
Thu 9/31:59 pm
DCA
- ONT
1 stop12h 51m
Frontier
Deal found 7/2![Frontier logo]()
$362
This United Airlines deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 12/21:00 pm
ONT
- IAD
1 stop7h 13m
United Airlines
Wed 12/96:30 am
IAD
- ONT
1 stop8h 50m
United Airlines
Deal found 7/7![United Airlines logo]()
$367
This Southwest deal was found by Cheapflights users on 7/6. Clicking the “Pick Dates” 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 8/205:40 am
ONT
- DCA
1 stop8h 00m
Southwest
Thu 8/2710:55 am
DCA
- ONT
2 stops11h 25m
Southwest
Deal found 7/6![Southwest logo]()
$371
This American Airlines deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 10/2310:10 pm
ONT
- SBY
1 stop9h 52m
American Airlines
Sun 10/256:41 am
SBY
- ONT
2 stops11h 35m
American Airlines
Deal found 7/7![American Airlines logo]()
$604
This Delta deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 10/2311:15 pm
ONT
- PHL
1 stop8h 01m
Delta
Wed 11/45:25 am
PHL
- ONT
1 stop8h 43m
Delta
Deal found 7/2![Delta logo]()
$335
This Alaska Airlines deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 9/153:14 pm
ONT
- PHL
1 stop11h 26m
Alaska Airlines
Tue 10/204:06 pm
PHL
- ONT
1 stop10h 47m
Alaska Airlines
Deal found 7/3![Alaska Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 7/6. Clicking the “Pick Dates” 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 9/2612:17 pm
ONT
- DCA
1 stop8h 26m
Delta
Sat 10/36:00 am
DCA
- ONT
1 stop8h 07m
Delta
Deal found 7/6![Delta logo]()
$341
This Southwest deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 8/188:30 am
ONT
- DCA
2 stops9h 25m
Southwest
Sat 8/2210:00 am
DCA
- ONT
1 stop7h 30m
Southwest
Deal found 7/2![Southwest logo]()
$394
This Delta deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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.
Wed 8/1212:00 pm
ONT
- PHL
1 stop8h 42m
Delta
Sun 8/307:00 pm
PHL
- ONT
1 stop7h 34m
Delta
Deal found 7/3![Delta logo]()
$348
This Frontier deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 7/233:40 pm
ONT
- IAD
1 stop13h 40m
Frontier
Sat 7/259:57 pm
IAD
- ONT
1 stop13h 40m
Frontier
Deal found 7/7![Frontier logo]()
$430
This United Airlines deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 9/96:08 am
ONT
- BWI
1 stop8h 32m
United Airlines
Sun 9/133:04 pm
BWI
- ONT
1 stop9h 55m
United Airlines
Deal found 7/7![United Airlines logo]()
$433
This Southwest deal was found by Cheapflights users on 7/4. Clicking the “Pick Dates” 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 8/49:40 am
ONT
- PHL
2 stops9h 05m
Southwest
Wed 8/510:45 am
PHL
- ONT
2 stops9h 50m
Southwest
Deal found 7/4![Southwest logo]()
$409
This Delta deal was found by Cheapflights users on 7/5. Clicking the “Pick Dates” 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.
Wed 9/1612:17 pm
ONT
- IAD
1 stop9h 23m
Delta
Fri 9/183:15 pm
IAD
- ONT
1 stop10h 11m
Delta
Deal found 7/5![Delta logo]()
$356
This United Airlines deal was found by Cheapflights users on 7/5. Clicking the “Pick Dates” 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.
Sat 10/316:00 am
ONT
- IAD
1 stop9h 33m
United Airlines
Mon 11/92:36 pm
IAD
- ONT
1 stop11h 17m
United Airlines
Deal found 7/5![United Airlines logo]()
$451
This Southwest deal was found by Cheapflights users on 7/4. Clicking the “Pick Dates” 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 8/205:15 am
ONT
- DCA
2 stops8h 10m
Southwest
Tue 8/256:05 am
DCA
- ONT
2 stops9h 25m
Southwest
Deal found 7/4![Southwest logo]()
$441
This Alaska Airlines deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 9/2912:12 pm
ONT
- BWI
1 stop26h 56m
Alaska Airlines
Tue 10/67:00 am
BWI
- ONT
1 stop9h 21m
Alaska Airlines
Deal found 7/2![Alaska Airlines logo]()
$502
This United Airlines deal was found by Cheapflights users on 7/5. Clicking the “Pick Dates” 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 9/307:00 am
ONT
- PHL
1 stop9h 42m
United Airlines
Sat 10/33:52 pm
PHL
- ONT
1 stop8h 06m
United Airlines
Deal found 7/5![United Airlines logo]()
$469
This Delta deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 8/3010:00 pm
ONT
- IAD
1 stop8h 20m
Delta
Tue 9/17:15 pm
IAD
- ONT
2 stops18h 27m
Delta
Deal found 7/7![Delta logo]()
$392
This Alaska Airlines deal was found by Cheapflights users on 7/6. Clicking the “Pick Dates” 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 9/164:50 pm
ONT
- BWI
2 stops22h 18m
Alaska Airlines
Fri 9/187:15 pm
BWI
- ONT
2 stops23h 55m
Alaska Airlines
Deal found 7/6![Alaska Airlines logo]()
$515
This United Airlines deal was found by Cheapflights users on 7/6. Clicking the “Pick Dates” 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.
Sun 9/276:00 am
ONT
- IAD
1 stop10h 02m
United Airlines
Wed 9/305:48 pm
IAD
- ONT
1 stop8h 11m
United Airlines
Deal found 7/6![United Airlines logo]()
$476
This Southwest deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 10/82:40 pm
ONT
- BWI
1 stop7h 50m
Southwest
Mon 10/129:00 am
BWI
- ONT
1 stop8h 10m
Southwest
Deal found 7/3![Southwest logo]()
$484
This Delta deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 11/2111:55 am
ONT
- IAD
1 stop8h 56m
Delta
Thu 11/267:00 am
IAD
- ONT
1 stop7h 27m
Delta
Deal found 7/3![Delta logo]()
$405
This Southwest deal was found by Cheapflights users on 7/2. Clicking the “Pick Dates” 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 8/238:30 pm
ONT
- DCA
2 stops9h 20m
Southwest
Thu 8/271:30 pm
DCA
- ONT
2 stops8h 55m
Southwest
Deal found 7/2![Southwest logo]()
$485
This United Airlines deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 9/49:01 am
ONT
- IAD
1 stop10h 18m
United Airlines
Sun 9/66:30 am
IAD
- ONT
1 stop9h 20m
United Airlines
Deal found 7/7![United Airlines logo]()
$491
This Delta deal was found by Cheapflights users on 7/4. Clicking the “Pick Dates” 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.
Wed 9/231:04 pm
ONT
- IAD
1 stop7h 29m
Delta
Fri 10/25:12 pm
IAD
- ONT
1 stop8h 14m
Delta
Deal found 7/4![Delta logo]()
$420
This Alaska Airlines deal was found by Cheapflights users on 7/5. Clicking the “Pick Dates” 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 8/283:07 pm
ONT
- BWI
1 stop12h 23m
Alaska Airlines
Mon 8/317:15 pm
BWI
- ONT
1 stop18h 49m
Alaska Airlines
Deal found 7/5![Alaska Airlines logo]()
$567
This Southwest deal was found by Cheapflights users on 7/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/285:45 am
ONT
- PHL
2 stops9h 55m
Southwest
Fri 7/315:20 pm
PHL
- ONT
2 stops9h 50m
Southwest
Deal found 7/4![Southwest logo]()
$489
This United Airlines deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 8/177:13 pm
ONT
- PHL
2 stops14h 10m
United Airlines
Thu 8/2710:34 am
PHL
- ONT
2 stops12h 27m
United Airlines
Deal found 7/3![United Airlines logo]()
$513
Last-minute flights from Ontario to MarylandDiscover last-minute flight deals from Ontario to Maryland. Data last updated July 7, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Maryland. Data last updated July 7, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 7/223:40 pm
ONT
- PHL
1 stop11h 20m
Frontier
Thu 8/68:37 pm
PHL
- ONT
1 stop16h 27m
Frontier
Deal found 7/3![Frontier logo]()
$309
This Gotogate deal was found by Cheapflights users on 7/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/309:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Thu 8/64:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 7/5![Frontier logo]()
$248
This CheapOair deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/319:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Thu 8/64:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 7/7![Frontier logo]()
$257
This CheapOair deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/59:36 am
ONT
- BWI
1 stop7h 58m
Frontier
Tue 8/114:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 7/7![Frontier logo]()
$252
This Booking.com deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 stop7h 58m
Frontier
Tue 8/114:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 7/7![Frontier logo]()
$250
This Booking.com deal was found by Cheapflights users on 7/4. Clicking the “Pick Dates” 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.
Mon 8/109:36 am
ONT
- BWI
1 stop7h 58m
Frontier
Sun 8/164:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 7/4![Frontier logo]()
$254
This Booking.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 8/129:36 am
ONT
- BWI
1 stop7h 58m
Frontier
Fri 8/144:44 pm
BWI
- ONT
1 stop17h 48m
Frontier
Deal found 7/3![Frontier logo]()
$255
This Booking.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 8/139:36 am
ONT
- BWI
1 stop7h 58m
Frontier
Wed 8/191:24 pm
BWI
- ONT
1 stop8h 37m
Frontier
Deal found 7/3![Frontier logo]()
$243
This Frontier deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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.
Sat 8/159:36 am
ONT
- BWI
1 stop7h 58m
Frontier
Sat 8/221:24 pm
BWI
- ONT
1 stop8h 37m
Frontier
Deal found 7/7![Frontier logo]()
$242
This Booking.com deal was found by Cheapflights users on 7/5. Clicking the “Pick Dates” 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.
Sat 8/159:36 am
ONT
- BWI
1 stop7h 58m
Frontier
Thu 8/201:24 pm
BWI
- ONT
1 stop21h 08m
Frontier
Deal found 7/5![Frontier logo]()
$249
This Frontier deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 8/219:33 am
ONT
- BWI
1 stop8h 04m
Frontier
Wed 8/261:24 pm
BWI
- ONT
1 stop8h 37m
Frontier
Deal found 7/7![Frontier logo]()
$247
This Mytrip deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/319:33 am
ONT
- BWI
1 stop8h 04m
Frontier
Sat 9/125:22 pm
BWI
- ONT
1 stop24h 15m
Frontier
Deal found 7/3![Frontier logo]()
$251
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 July 7, 2026.
Search for one-way flight options from Ontario to Maryland. Find affordable one-way fares based on user searches. Data last updated July 7, 2026.
This Trip.com deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 8/193:40 pm
ONT
- IAD
1 stop13h 24m
Frontier
Deal found 7/7![Frontier logo]()
$97
This Trip.com deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 8/111:38 pm
ONT
- IAD
1 stop15h 42m
Frontier
Deal found 7/7![Frontier logo]()
$99
This Trip.com deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” 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 8/253:40 pm
ONT
- IAD
1 stop13h 24m
Frontier
Deal found 7/3![Frontier logo]()
$116
This Super.com deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 8/108:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 7/7![Frontier logo]()
$118
This Super.com deal was found by Cheapflights users on 7/6. Clicking the “Pick Dates” 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 7/279:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Deal found 7/6![Frontier logo]()
$119
This Super.com deal was found by Cheapflights users on 7/6. Clicking the “Pick Dates” 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 7/306:00 am
ONT
- DCA
1 stop7h 59m
Frontier
Deal found 7/6![Frontier logo]()
$119
This Expedia deal was found by Cheapflights users on 7/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/55:08 pm
ONT
- PHL
1 stop9h 52m
Frontier
Deal found 7/6![Frontier logo]()
$120
This Super.com deal was found by Cheapflights users on 7/6. Clicking the “Pick Dates” 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 8/136:00 am
ONT
- DCA
1 stop7h 59m
Frontier
Deal found 7/6![Frontier logo]()
$120
This Frontier deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 7/309:32 am
ONT
- BWI
1 stop8h 04m
Frontier
Deal found 7/7![Frontier logo]()
$121
This Frontier deal was found by Cheapflights users on 7/6. Clicking the “Pick Dates” 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 8/410:49 am
ONT
- DCA
1 stop8h 10m
Frontier
Deal found 7/6![Frontier logo]()
$121
This Frontier deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” 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 7/298:17 am
ONT
- PHL
1 stop8h 12m
Frontier
Deal found 7/7![Frontier logo]()
$122
This Booking.com deal was found by Cheapflights users on 7/6. Clicking the “Pick Dates” 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.
Tue 8/1110:49 am
ONT
- DCA
1 stop8h 10m
Frontier
Deal found 7/6![Frontier logo]()
$122
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 July 7, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $242 (Expedia) |
One-way from | $97 (Trip.com) |
Popular in | March |
Cheapest in | September |
Average price | $403 |
Good round-trip deal | $497 or less |
Good one-way deal | $278 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 July 7, 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
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Fri 10/23
11:15 pm-10:16 am
1 stop8h 01m
Philadelphia
Tue 11/3
7:20 am-12:22 pm
1 stop8h 02m
$335
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Fri 10/23
11:15 pm-10:16 am
1 stop8h 01m
Philadelphia
Wed 11/4
5:25 am-11:08 am
1 stop8h 43m
$335
OntarioWashington, D.C.
ONT - IAD
ONTIAD
Ontario
Wed 9/9
3:14 pm-5:40 am
1 stop11h 26m
Washington, D.C. Dulles Intl
Wed 9/16
7:00 am-2:16 pm
1 stop10h 16m
$341
OntarioWashington, D.C.
ONT - DCA
ONTDCA
Ontario
Sat 9/26
12:17 pm-11:43 pm
1 stop8h 26m
Washington, D.C. Reagan-National
Sat 10/3
6:00 am-11:07 am
1 stop8h 07m
$341
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Wed 8/12
12:00 pm-11:42 pm
1 stop8h 42m
Philadelphia
Sun 8/30
7:00 pm-11:34 pm
1 stop7h 34m
$348
OntarioWashington, D.C.
ONT - IAD
ONTIAD
Ontario
Wed 9/16
12:17 pm-12:40 am
1 stop9h 23m
Washington, D.C. Dulles Intl
Fri 9/18
3:15 pm-10:26 pm
1 stop10h 11m
$356
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 9/15
3:14 pm-5:40 am
1 stop11h 26m
Philadelphia
Tue 10/20
4:06 pm-11:53 pm
1 stop10h 47m
$359
OntarioWashington, D.C.
ONT - DCA
ONTDCA
Ontario
Thu 8/20
6:00 am-4:59 pm
1 stop7h 59m
Washington, D.C. Reagan-National
Thu 9/3
1:59 pm-11:50 pm
1 stop12h 51m
$362
OntarioWashington, D.C.
ONT - IAD
ONTIAD
Ontario
Wed 12/2
1:00 pm-11:13 pm
1 stop7h 13m
Washington, D.C. Dulles Intl
Wed 12/9
6:30 am-12:20 pm
1 stop8h 50m
$367
OntarioWashington, D.C.
ONT - DCA
ONTDCA
Ontario
Thu 8/20
5:40 am-4:40 pm
1 stop8h 00m
Washington, D.C. Reagan-National
Thu 8/27
10:55 am-7:20 pm
2 stops11h 25m
$371
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-DCA
ONT-IAD
ONT-BWI
ONT-PHL
ONT-SBY
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-DCA
ONT-IAD
ONT-BWI
ONT-PHL
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 July 7, 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 July 7, 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 54 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 July 7, 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.
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Overall
7.9
Crew
8.6
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Overall
7.9
Crew
8.6
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Overall
7.9
Crew
8.6
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Overall
7.9
Crew
8.6
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Overall
7.9
Crew
8.6
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Entertainment
7.5
Boarding
8.1
Food
7.0
Comfort
8.0
Overall
7.9
Crew
8.6
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 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 July 7, 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 July 7, 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$388 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$339 | Average$484 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$434 | Average$513 | FlexibilityNo cancel fee | On-time71% |