$112+ 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 8/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Aug 30 — Sep 61
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Maryland with Cheapflights
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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 31, 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 31, 2026.
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/273:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Thu 9/37:00 am
PHL
- ONT
1 stop12h 22m
Frontier
Deal found 7/30![Frontier logo]()
$212
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2911:50 am
ONT
- PHL
1 stop15h 40m
Frontier
Sat 9/58:37 pm
PHL
- ONT
1 stop16h 27m
Frontier
Deal found 7/30![Frontier logo]()
$214
This CheapOair deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2410:17 pm
ONT
- PHL
1 stop29h 13m
Frontier
Thu 8/278:37 pm
PHL
- ONT
1 stop30h 13m
Frontier
Deal found 7/30![Frontier logo]()
$222
This FlightHub deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:00 am
ONT
- PHL
1 stop20h 39m
Frontier
Mon 9/78:37 pm
PHL
- ONT
1 stop16h 27m
Frontier
Deal found 7/30![Frontier logo]()
$227
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/303:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Tue 9/810:15 pm
PHL
- ONT
1 stop13h 54m
Frontier
Deal found 7/30![Frontier logo]()
$231
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/39:33 am
ONT
- BWI
1 stop8h 04m
Frontier
Wed 9/1612:45 pm
BWI
- ONT
1 stop8h 31m
Frontier
Deal found 7/30![Frontier logo]()
$232
This Frontier deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/279:33 am
ONT
- BWI
1 stop8h 04m
Frontier
Wed 9/21:24 pm
BWI
- ONT
1 stop8h 37m
Frontier
Deal found 7/29![Frontier logo]()
$233
This Travelocity deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/510:59 am
ONT
- BWI
1 stop30h 38m
Frontier
Tue 9/81:24 pm
BWI
- ONT
1 stop8h 37m
Frontier
Deal found 7/30![Frontier logo]()
$236
This Booking.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com 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
Tue 9/11:24 pm
BWI
- ONT
1 stop8h 37m
Frontier
Deal found 7/30![Frontier logo]()
$237
This CheapOair deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/253:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Sun 8/307:00 am
PHL
- ONT
1 stop28h 03m
Frontier
Deal found 7/30![Frontier logo]()
$241
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/253:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Fri 8/288:00 am
PHL
- ONT
1 stop11h 22m
Frontier
Deal found 7/30![Frontier logo]()
$242
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/177:46 pm
ONT
- BWI
1 stop13h 14m
Frontier
Sun 9/201:29 pm
BWI
- ONT
1 stop8h 10m
Frontier
Deal found 7/30![Frontier logo]()
$247
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 31, 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 31, 2026.
This Delta deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/297:05 am
ONT
- PHL
1 stop7h 34m
Delta
Sat 9/56:00 am
PHL
- ONT
1 stop7h 42m
Delta
Deal found 7/26![Delta logo]()
$311
This Kiwi.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:15 am
ONT
- DCA
1 stop7h 44m
Frontier
Sat 9/197:00 am
DCA
- ONT
2 stops12h 46m
Frontier
Deal found 7/31![Frontier logo]()
$324
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/31:52 pm
ONT
- IAD
1 stop8h 14m
United Airlines
Sat 10/105:48 pm
IAD
- ONT
1 stop8h 03m
United Airlines
Deal found 7/28![United Airlines logo]()
$351
This Southwest deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 9/178:40 pm
ONT
- BWI
1 stop6h 50m
Southwest
Sat 9/1910:15 am
BWI
- ONT
1 stop9h 15m
Southwest
Deal found 7/31![Southwest logo]()
$353
This Alaska Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/173:14 pm
ONT
- IAD
1 stop11h 26m
Alaska Airlines
Tue 9/227:00 am
IAD
- ONT
1 stop10h 16m
Alaska Airlines
Deal found 7/27![Alaska Airlines logo]()
$376
This American Airlines deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/196:15 am
ONT
- SBY
2 stops11h 47m
American Airlines
Sat 9/266:00 am
SBY
- ONT
2 stops9h 03m
American Airlines
Deal found 7/26![American Airlines logo]()
$543
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/226:00 pm
ONT
- PHL
1 stop8h 50m
Delta
Sat 9/266:00 am
PHL
- ONT
1 stop8h 05m
Delta
Deal found 7/27![Delta logo]()
$311
This Delta deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/510:00 pm
ONT
- PHL
1 stop8h 29m
Delta
Tue 10/137:20 am
PHL
- ONT
1 stop8h 01m
Delta
Deal found 7/29![Delta logo]()
$311
This Southwest deal was found by Cheapflights users on 7/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/267:25 am
ONT
- BWI
1 stop6h 40m
Southwest
Thu 8/276:35 am
BWI
- ONT
2 stops9h 50m
Southwest
Deal found 7/26![Southwest logo]()
$358
This Alaska Airlines deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/163:14 pm
ONT
- IAD
1 stop11h 26m
Alaska Airlines
Sat 9/267:00 am
IAD
- ONT
1 stop10h 16m
Alaska Airlines
Deal found 7/29![Alaska Airlines logo]()
$376
This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/265:45 am
ONT
- DCA
2 stops9h 15m
Southwest
Wed 9/26:05 am
DCA
- ONT
2 stops9h 25m
Southwest
Deal found 7/29![Southwest logo]()
$361
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/115:53 pm
ONT
- PHL
1 stop8h 52m
Delta
Sun 11/156:48 pm
PHL
- ONT
1 stop8h 10m
Delta
Deal found 7/30![Delta logo]()
$340
This United Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/128:00 am
ONT
- PHL
1 stop8h 15m
United Airlines
Thu 9/176:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 7/27![United Airlines logo]()
$416
This Alaska Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 10/27:59 pm
ONT
- PHL
1 stop18h 39m
Alaska Airlines
Sun 10/46:41 pm
PHL
- ONT
1 stop18h 36m
Alaska Airlines
Deal found 7/31![Alaska Airlines logo]()
$390
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/154:09 pm
ONT
- IAD
1 stop13h 11m
Frontier
Sun 8/308:59 am
IAD
- ONT
1 stop10h 23m
Frontier
Deal found 7/30![Frontier logo]()
$445
This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/208:30 am
ONT
- BWI
2 stops11h 55m
Southwest
Mon 8/246:35 am
BWI
- ONT
2 stops8h 25m
Southwest
Deal found 7/29![Southwest logo]()
$369
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/191:18 pm
ONT
- PHL
1 stop7h 26m
United Airlines
Mon 9/2112:22 pm
PHL
- ONT
1 stop8h 49m
United Airlines
Deal found 7/30![United Airlines logo]()
$421
This Delta deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/155:15 pm
ONT
- BWI
1 stop10h 03m
Delta
Sat 9/266:00 am
BWI
- ONT
1 stop8h 05m
Delta
Deal found 7/27![Delta logo]()
$353
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1910:05 am
ONT
- PHL
2 stops8h 55m
Southwest
Mon 11/236:00 am
PHL
- ONT
2 stops10h 00m
Southwest
Deal found 7/28![Southwest logo]()
$380
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/309:25 am
ONT
- PHL
1 stop10h 24m
United Airlines
Tue 11/39:10 am
PHL
- ONT
1 stop9h 23m
United Airlines
Deal found 7/28![United Airlines logo]()
$426
This Alaska Airlines deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/243:14 pm
ONT
- IAD
1 stop11h 26m
Alaska Airlines
Mon 9/287:47 pm
IAD
- ONT
2 stops23h 23m
Alaska Airlines
Deal found 7/29![Alaska Airlines logo]()
$450
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 10/410:00 pm
ONT
- PHL
1 stop8h 27m
Delta
Wed 10/76:35 am
PHL
- ONT
1 stop7h 31m
Delta
Deal found 7/31![Delta logo]()
$394
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2412:25 pm
ONT
- DCA
2 stops8h 30m
Southwest
Sat 9/52:30 pm
DCA
- ONT
2 stops9h 25m
Southwest
Deal found 7/30![Southwest logo]()
$401
This United Airlines deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:01 am
ONT
- IAD
1 stop9h 21m
United Airlines
Sun 8/306:42 am
IAD
- ONT
1 stop8h 30m
United Airlines
Deal found 7/28![United Airlines logo]()
$460
This Alaska Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2911:13 am
ONT
- IAD
1 stop9h 46m
Alaska Airlines
Fri 11/66:40 pm
IAD
- ONT
2 stops26h 11m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$480
This Southwest deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2812:25 pm
ONT
- DCA
2 stops8h 30m
Southwest
Sat 10/37:30 am
DCA
- ONT
2 stops11h 10m
Southwest
Deal found 7/28![Southwest logo]()
$411
This United Airlines deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/265:00 am
ONT
- BWI
2 stops10h 42m
United Airlines
Sat 8/291:00 pm
BWI
- ONT
2 stops10h 53m
United Airlines
Deal found 7/29![United Airlines logo]()
$473
This Alaska Airlines deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3011:13 am
ONT
- IAD
1 stop9h 46m
Alaska Airlines
Fri 11/66:40 pm
IAD
- ONT
2 stops26h 11m
Alaska Airlines
Deal found 7/27![Alaska Airlines logo]()
$480
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2812:18 pm
ONT
- DCA
1 stop7h 31m
Delta
Sun 11/16:00 am
DCA
- ONT
1 stop8h 06m
Delta
Deal found 7/30![Delta logo]()
$446
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/248:30 am
ONT
- PHL
2 stops9h 40m
Southwest
Sun 9/275:00 am
PHL
- ONT
2 stops9h 35m
Southwest
Deal found 7/30![Southwest logo]()
$422
Last-minute flights from Ontario to MarylandDiscover last-minute flight deals from Ontario to Maryland. Data last updated July 31, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Maryland. Data last updated July 31, 2026 and is based on user searches.
This Booking.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com 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
Tue 9/11:24 pm
BWI
- ONT
1 stop8h 37m
Frontier
Deal found 7/30![Frontier logo]()
$237
This CheapOair deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2410:17 pm
ONT
- PHL
1 stop29h 13m
Frontier
Thu 8/278:37 pm
PHL
- ONT
1 stop30h 13m
Frontier
Deal found 7/30![Frontier logo]()
$222
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/249:33 am
ONT
- BWI
1 stop8h 04m
Frontier
Tue 9/11:24 pm
BWI
- ONT
1 stop8h 37m
Frontier
Deal found 7/30![Frontier logo]()
$232
This CheapOair deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/253:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Sun 8/307:00 am
PHL
- ONT
1 stop28h 03m
Frontier
Deal found 7/30![Frontier logo]()
$241
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/253:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Fri 8/288:00 am
PHL
- ONT
1 stop11h 22m
Frontier
Deal found 7/30![Frontier logo]()
$242
This CheapOair deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2510:59 am
ONT
- BWI
1 stop30h 38m
Frontier
Wed 9/95:42 pm
BWI
- ONT
1 stop27h 06m
Frontier
Deal found 7/29![Frontier logo]()
$252
This Expedia deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/273:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Thu 9/37:00 am
PHL
- ONT
1 stop12h 22m
Frontier
Deal found 7/30![Frontier logo]()
$212
This Frontier deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/279:33 am
ONT
- BWI
1 stop8h 04m
Frontier
Wed 9/21:24 pm
BWI
- ONT
1 stop8h 37m
Frontier
Deal found 7/29![Frontier logo]()
$233
This Orbitz deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2711:15 am
ONT
- PHL
1 stop16h 15m
Frontier
Sat 9/58:37 pm
PHL
- ONT
1 stop16h 27m
Frontier
Deal found 7/27![Frontier logo]()
$248
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2911:50 am
ONT
- PHL
1 stop15h 40m
Frontier
Sat 9/58:37 pm
PHL
- ONT
1 stop16h 27m
Frontier
Deal found 7/30![Frontier logo]()
$214
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/303:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Tue 9/810:15 pm
PHL
- ONT
1 stop13h 54m
Frontier
Deal found 7/30![Frontier logo]()
$231
This Booking.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/309:33 am
ONT
- BWI
1 stop8h 04m
Frontier
Tue 9/11:24 pm
BWI
- ONT
1 stop8h 37m
Frontier
Deal found 7/30![Frontier logo]()
$247
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 31, 2026.
Search for one-way flight options from Ontario to Maryland. Find affordable one-way fares based on user searches. Data last updated July 31, 2026.
This Priceline deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/203:40 pm
ONT
- PHL
1 stop11h 50m
Frontier
Deal found 7/30![Frontier logo]()
$112
This Super.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 9/39:33 am
ONT
- BWI
1 stop8h 04m
Frontier
Deal found 7/31![Frontier logo]()
$113
This Super.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/279:33 am
ONT
- BWI
1 stop8h 04m
Frontier
Deal found 7/30![Frontier logo]()
$114
This Super.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:00 am
ONT
- DCA
1 stop7h 59m
Frontier
Deal found 7/30![Frontier logo]()
$114
This Super.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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.
Sat 9/126:15 am
ONT
- DCA
1 stop7h 44m
Frontier
Deal found 7/31![Frontier logo]()
$115
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier 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
Deal found 7/30![Frontier logo]()
$116
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:00 am
ONT
- DCA
1 stop7h 59m
Frontier
Deal found 7/30![Frontier logo]()
$116
This Trip.com deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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 7/28![Frontier logo]()
$116
This Super.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com 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
Deal found 7/30![Frontier logo]()
$119
This Super.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:15 am
ONT
- DCA
1 stop7h 44m
Frontier
Deal found 7/30![Frontier logo]()
$119
This Super.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/249:33 am
ONT
- BWI
1 stop8h 04m
Frontier
Deal found 7/29![Frontier logo]()
$120
This Super.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/286:00 am
ONT
- DCA
1 stop7h 59m
Frontier
Deal found 7/29![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 July 31, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $212 (Expedia) |
One-way from | $112 (Priceline) |
Popular in | March |
Cheapest in | September |
Average price | $469 |
Good round-trip deal | $459 or less |
Good one-way deal | $262 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 31, 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
Quickest round-trip
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Sat 8/29
7:05 am-5:39 pm
1 stop7h 34m
Philadelphia
Sat 9/5
6:00 am-10:42 am
1 stop7h 42m
$311
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 9/22
6:00 pm-5:50 am
1 stop8h 50m
Philadelphia
Sat 9/26
6:00 am-11:05 am
1 stop8h 05m
$311
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 10/5
10:00 pm-9:29 am
1 stop8h 29m
Philadelphia
Tue 10/13
7:20 am-12:21 pm
1 stop8h 01m
$311
OntarioWashington, D.C.
ONT - DCA
ONTDCA
Ontario
Thu 9/17
6:15 am-4:59 pm
1 stop7h 44m
Washington, D.C. Reagan-National
Sat 9/19
7:00 am-4:46 pm
2 stops12h 46m
$324
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Wed 11/11
5:53 pm-5:45 am
1 stop8h 52m
Philadelphia
Sun 11/15
6:48 pm-11:58 pm
1 stop8h 10m
$340
OntarioWashington, D.C.
ONT - IAD
ONTIAD
Ontario
Sat 10/3
1:52 pm-1:06 am
1 stop8h 14m
Washington, D.C. Dulles Intl
Sat 10/10
5:48 pm-10:51 pm
1 stop8h 03m
$351
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Thu 9/17
8:40 pm-6:30 am
1 stop6h 50m
Baltimore/Washington
Sat 9/19
10:15 am-4:30 pm
1 stop9h 15m
$353
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Tue 9/15
5:15 pm-6:18 am
1 stop10h 03m
Baltimore/Washington
Sat 9/26
6:00 am-11:05 am
1 stop8h 05m
$353
OntarioBaltimore
ONT - BWI
ONTBWI
Ontario
Wed 8/26
7:25 am-5:05 pm
1 stop6h 40m
Baltimore/Washington
Thu 8/27
6:35 am-1:25 pm
2 stops9h 50m
$358
OntarioWashington, D.C.
ONT - DCA
ONTDCA
Ontario
Wed 8/26
5:45 am-6:00 pm
2 stops9h 15m
Washington, D.C. Reagan-National
Wed 9/2
6:05 am-12:30 pm
2 stops9h 25m
$361
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
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-PHL
ONT-BWI
ONT-DCA
ONT-IAD
What is the cheapest month to book a flight from Ontario to Maryland?
Currently, February is the cheapest month in which you can book a flight from Ontario to Maryland (average of $363). Flying from Ontario to Maryland in June is currently the most expensive (average of $550). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
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 31, 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.
How much does it cost to fly round-trip from Ontario to Maryland?
Airfare is below average for this route at the moment.
Ontario to Maryland flights typically cost between $434 and $519 in September.The cheapest round-trip price found within the last 5 days was $232 on Frontier (Sep 3-Sep 16).
How far ahead should I book a flight from Ontario to Maryland?
The best time to book flights from Ontario to Maryland is 55 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 31, 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.
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
10.0
ExcellentJoseph,Sep 2023
LAX - BWI
Food
7.0
Boarding
8.1
Overall
8.0
Comfort
8.0
Entertainment
7.5
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 31, 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 31, 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$352 | Average$481 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$434 | Average$513 | FlexibilityNo cancel fee | On-time71% |