$80+ 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 5/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BWI
Jun 3 — Jun 101
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Ontario to Maryland with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Ontario to Maryland
Cheapest
Best
Last-minute
One-way
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 May 4, 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 May 4, 2026.
This Trip.com deal was found by Cheapflights users on 5/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
ONT
- PHL
1 stop20h 37m
Frontier
Wed 6/1011:00 am
PHL
- ONT
1 stop11h 51m
Frontier
Deal found 5/2![Frontier logo]()
$179
This Frontier deal was found by Cheapflights users on 4/29. 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.
Sun 5/246:00 am
ONT
- DCA
1 stop12h 58m
Frontier
Wed 5/271:59 pm
DCA
- ONT
1 stop12h 50m
Frontier
Deal found 4/29![Frontier logo]()
$185
This Frontier deal was found by Cheapflights users on 5/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/264:39 pm
ONT
- PHL
1 stop10h 42m
Frontier
Mon 6/110:40 am
PHL
- ONT
1 stop11h 52m
Frontier
Deal found 5/3![Frontier logo]()
$190
This Booking.com deal was found by Cheapflights users on 5/2. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/206:00 am
ONT
- PHL
1 stop20h 37m
Frontier
Sat 5/238:35 pm
PHL
- ONT
1 stop16h 30m
Frontier
Deal found 5/2![Frontier logo]()
$193
This Trip.com deal was found by Cheapflights users on 4/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/204:39 pm
ONT
- IAD
1 stop12h 33m
Frontier
Wed 5/279:12 am
IAD
- ONT
1 stop9h 32m
Frontier
Deal found 4/29![Frontier logo]()
$197
This Expedia deal was found by Cheapflights users on 4/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/2310:50 am
ONT
- PHL
1 stop15h 47m
Frontier
Tue 5/268:35 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 4/29![Frontier logo]()
$205
This Frontier deal was found by Cheapflights users on 4/29. 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.
Sun 5/2410:50 am
ONT
- DCA
1 stop8h 08m
Frontier
Fri 5/291:59 pm
DCA
- ONT
1 stop12h 50m
Frontier
Deal found 4/29![Frontier logo]()
$205
This Trip.com deal was found by Cheapflights users on 4/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
ONT
- PHL
1 stop20h 37m
Frontier
Thu 5/288:35 pm
PHL
- ONT
1 stop16h 30m
Frontier
Deal found 4/30![Frontier logo]()
$206
This Trip.com deal was found by Cheapflights users on 4/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/204:39 pm
ONT
- IAD
1 stop12h 33m
Frontier
Sun 5/249:12 am
IAD
- ONT
1 stop25h 52m
Frontier
Deal found 4/29![Frontier logo]()
$207
This Mytrip deal was found by Cheapflights users on 4/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/96:00 am
ONT
- PHL
1 stop26h 47m
Frontier
Tue 6/2312:42 pm
PHL
- ONT
1 stop14h 07m
Frontier
Deal found 4/29![Frontier logo]()
$210
This CheapOair deal was found by Cheapflights users on 4/29. 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 5/268:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Tue 6/24:29 pm
BWI
- ONT
1 stop18h 06m
Frontier
Deal found 4/29![Frontier logo]()
$210
This Frontier deal was found by Cheapflights users on 4/30. 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 8/46:00 am
ONT
- DCA
1 stop7h 59m
Frontier
Tue 8/186:00 pm
DCA
- ONT
1 stop8h 49m
Frontier
Deal found 4/30![Frontier logo]()
$210
Best flights from Ontario to MarylandDiscover carefully curated flight deals from Ontario to Maryland that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 4, 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 May 4, 2026.
This Delta deal was found by Cheapflights users on 5/2. 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.
Mon 8/1710:00 pm
ONT
- IAD
1 stop8h 19m
Delta
Thu 8/2012:30 pm
IAD
- ONT
1 stop8h 59m
Delta
Deal found 5/2![Delta logo]()
$321
This United Airlines deal was found by Cheapflights users on 4/29. 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.
Mon 9/289:39 am
ONT
- PHL
1 stop8h 36m
United Airlines
Thu 10/13:48 pm
PHL
- ONT
1 stop8h 04m
United Airlines
Deal found 4/29![United Airlines logo]()
$327
This Southwest deal was found by Cheapflights users on 4/29. 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 9/231:50 pm
ONT
- PHL
1 stop7h 00m
Southwest
Mon 9/2810:20 am
PHL
- ONT
1 stop8h 50m
Southwest
Deal found 4/29![Southwest logo]()
$343
This Alaska Airlines deal was found by Cheapflights users on 5/3. 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 6/24:03 pm
ONT
- PHL
1 stop10h 32m
Alaska Airlines
Wed 6/34:45 pm
PHL
- ONT
1 stop10h 11m
Alaska Airlines
Deal found 5/3![Alaska Airlines logo]()
$361
This American Airlines deal was found by Cheapflights users on 5/3. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/156:00 am
ONT
- IAD
2 stops12h 53m
American Airlines
Tue 8/186:10 am
IAD
- ONT
1 stop8h 32m
American Airlines
Deal found 5/3![American Airlines logo]()
$418
This Delta deal was found by Cheapflights users on 5/2. 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.
Wed 9/1612:00 pm
ONT
- DCA
1 stop8h 24m
Delta
Tue 9/296:00 am
DCA
- ONT
2 stops15h 01m
Delta
Deal found 5/2![Delta logo]()
$326
This Southwest deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 7/142:50 pm
ONT
- PHL
1 stop7h 10m
Southwest
Tue 7/214:35 pm
PHL
- ONT
2 stops9h 10m
Southwest
Deal found 5/1![Southwest logo]()
$354
This Alaska Airlines deal was found by Cheapflights users on 5/2. 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.
Wed 9/303:12 pm
ONT
- IAD
1 stop11h 28m
Alaska Airlines
Sun 10/47:00 am
IAD
- ONT
1 stop10h 47m
Alaska Airlines
Deal found 5/2![Alaska Airlines logo]()
$371
This United Airlines deal was found by Cheapflights users on 4/29. 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.
Thu 5/216:30 pm
ONT
- PHL
1 stop8h 01m
United Airlines
Mon 5/258:00 am
PHL
- ONT
1 stop7h 47m
United Airlines
Deal found 4/29![United Airlines logo]()
$380
This Delta deal was found by Cheapflights users on 4/29. 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 8/1710:59 pm
ONT
- PHL
1 stop7h 39m
Delta
Thu 8/276:45 am
PHL
- ONT
1 stop7h 19m
Delta
Deal found 4/29![Delta logo]()
$357
This Southwest deal was found by Cheapflights users on 4/29. 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.
Mon 9/285:15 am
ONT
- PHL
2 stops9h 40m
Southwest
Thu 10/14:40 pm
PHL
- ONT
1 stop8h 55m
Southwest
Deal found 4/29![Southwest logo]()
$366
This Delta deal was found by Cheapflights users on 4/29. 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.
Fri 8/1410:59 pm
ONT
- IAD
1 stop7h 51m
Delta
Tue 8/186:00 am
IAD
- ONT
1 stop8h 04m
Delta
Deal found 4/29![Delta logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 10/1412:00 pm
ONT
- IAD
1 stop8h 59m
Alaska Airlines
Sun 10/189:30 am
IAD
- ONT
1 stop11h 43m
Alaska Airlines
Deal found 5/1![Alaska Airlines logo]()
$401
This Southwest deal was found by Cheapflights users on 4/29. 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 9/99:40 am
ONT
- PHL
2 stops9h 05m
Southwest
Sun 9/135:00 am
PHL
- ONT
2 stops9h 35m
Southwest
Deal found 4/29![Southwest logo]()
$374
This United Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 6/86:30 pm
ONT
- PHL
2 stops12h 15m
United Airlines
Tue 6/166:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 5/1![United Airlines logo]()
$424
This Alaska Airlines deal was found by Cheapflights users on 4/30. 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 6/46:00 am
ONT
- BWI
1 stop9h 35m
Alaska Airlines
Sat 6/64:17 pm
BWI
- ONT
1 stop10h 39m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$416
This KAYAK deal was found by Cheapflights users on 4/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/2412:07 pm
ONT
- DCA
1 stop8h 37m
Delta
Thu 5/2812:00 pm
DCA
- ONT
1 stop9h 36m
Delta
Deal found 4/29![Delta logo]()
$385
This United Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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 7/185:45 am
ONT
- DCA
1 stop7h 18m
United Airlines
Wed 8/122:00 pm
DCA
- ONT
1 stop7h 19m
United Airlines
Deal found 5/1![United Airlines logo]()
$431
This Southwest deal was found by Cheapflights users on 5/3. 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.
Sat 7/2511:55 pm
ONT
- DCA
1 stop8h 25m
Southwest
Sat 8/13:35 pm
DCA
- ONT
2 stops10h 15m
Southwest
Deal found 5/3![Southwest logo]()
$396
This Alaska Airlines deal was found by Cheapflights users on 4/29. 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.
Fri 9/113:12 pm
ONT
- IAD
1 stop11h 28m
Alaska Airlines
Sun 9/137:00 am
IAD
- ONT
1 stop10h 18m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$421
This United Airlines deal was found by Cheapflights users on 5/3. 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.
Wed 6/106:30 pm
ONT
- PHL
2 stops12h 15m
United Airlines
Tue 6/166:00 am
PHL
- ONT
1 stop9h 12m
United Airlines
Deal found 5/3![United Airlines logo]()
$433
This Southwest deal was found by Cheapflights users on 5/3. 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.
Sat 7/112:20 pm
ONT
- PHL
1 stop6h 45m
Southwest
Wed 7/155:15 am
PHL
- ONT
2 stops9h 15m
Southwest
Deal found 5/3![Southwest logo]()
$409
This American Airlines deal was found by Cheapflights users on 4/30. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/217:00 am
ONT
- SBY
2 stops12h 58m
American Airlines
Tue 7/284:33 pm
SBY
- ONT
1 stop9h 01m
American Airlines
Deal found 4/30![American Airlines logo]()
$660
This Southwest deal was found by Cheapflights users on 5/3. 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.
Tue 9/156:50 am
ONT
- DCA
2 stops9h 20m
Southwest
Sun 9/205:00 pm
DCA
- ONT
1 stop7h 55m
Southwest
Deal found 5/3![Southwest logo]()
$415
This United Airlines deal was found by Cheapflights users on 4/29. 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.
Fri 7/311:18 pm
ONT
- IAD
1 stop8h 27m
United Airlines
Wed 8/56:30 am
IAD
- ONT
1 stop9h 17m
United Airlines
Deal found 4/29![United Airlines logo]()
$469
This Alaska Airlines deal was found by Cheapflights users on 4/30. 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.
Tue 5/197:41 pm
ONT
- IAD
1 stop8h 53m
Alaska Airlines
Wed 5/276:00 am
IAD
- ONT
1 stop12h 09m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$485
This Delta deal was found by Cheapflights users on 4/30. 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.
Tue 5/199:50 am
ONT
- IAD
2 stops10h 48m
Delta
Sun 5/246:08 am
IAD
- ONT
1 stop7h 49m
Delta
Deal found 4/30![Delta logo]()
$490
This United Airlines deal was found by Cheapflights users on 5/3. 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.
Thu 7/21:18 pm
ONT
- IAD
1 stop8h 27m
United Airlines
Thu 9/32:36 pm
IAD
- ONT
1 stop8h 28m
United Airlines
Deal found 5/3![United Airlines logo]()
$471
This Southwest deal was found by Cheapflights users on 5/2. 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.
Sat 5/306:20 am
ONT
- BWI
2 stops7h 45m
Southwest
Mon 6/17:40 am
BWI
- ONT
2 stops10h 20m
Southwest
Deal found 5/2![Southwest logo]()
$450
This Delta deal was found by Cheapflights users on 4/30. 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.
Sat 5/2310:00 pm
ONT
- DCA
2 stops13h 02m
Delta
Mon 5/256:05 am
DCA
- ONT
2 stops9h 14m
Delta
Deal found 4/30![Delta logo]()
$500
Last-minute flights from Ontario to MarylandDiscover last-minute flight deals from Ontario to Maryland. Data last updated May 4, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Maryland. Data last updated May 4, 2026 and is based on user searches.
This Booking.com deal was found by Cheapflights users on 5/2. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/206:00 am
ONT
- PHL
1 stop20h 37m
Frontier
Sat 5/238:35 pm
PHL
- ONT
1 stop16h 30m
Frontier
Deal found 5/2![Frontier logo]()
$193
This Trip.com deal was found by Cheapflights users on 4/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/204:39 pm
ONT
- IAD
1 stop12h 33m
Frontier
Wed 5/279:12 am
IAD
- ONT
1 stop9h 32m
Frontier
Deal found 4/29![Frontier logo]()
$197
This Trip.com deal was found by Cheapflights users on 4/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/204:39 pm
ONT
- IAD
1 stop12h 33m
Frontier
Sun 5/249:12 am
IAD
- ONT
1 stop25h 52m
Frontier
Deal found 4/29![Frontier logo]()
$207
This Expedia deal was found by Cheapflights users on 4/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/2310:50 am
ONT
- PHL
1 stop15h 47m
Frontier
Tue 5/268:35 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 4/29![Frontier logo]()
$205
This Frontier deal was found by Cheapflights users on 4/29. 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.
Sun 5/246:00 am
ONT
- DCA
1 stop12h 58m
Frontier
Wed 5/271:59 pm
DCA
- ONT
1 stop12h 50m
Frontier
Deal found 4/29![Frontier logo]()
$185
This Frontier deal was found by Cheapflights users on 4/29. 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.
Sun 5/2410:50 am
ONT
- DCA
1 stop8h 08m
Frontier
Fri 5/291:59 pm
DCA
- ONT
1 stop12h 50m
Frontier
Deal found 4/29![Frontier logo]()
$205
This Frontier deal was found by Cheapflights users on 5/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/264:39 pm
ONT
- PHL
1 stop10h 42m
Frontier
Mon 6/110:40 am
PHL
- ONT
1 stop11h 52m
Frontier
Deal found 5/3![Frontier logo]()
$190
This CheapOair deal was found by Cheapflights users on 4/29. 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 5/268:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Tue 6/24:29 pm
BWI
- ONT
1 stop18h 06m
Frontier
Deal found 4/29![Frontier logo]()
$210
This Trip.com deal was found by Cheapflights users on 5/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
ONT
- PHL
1 stop20h 37m
Frontier
Wed 6/1011:00 am
PHL
- ONT
1 stop11h 51m
Frontier
Deal found 5/2![Frontier logo]()
$179
This Trip.com deal was found by Cheapflights users on 4/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
ONT
- PHL
1 stop20h 37m
Frontier
Thu 5/288:35 pm
PHL
- ONT
1 stop16h 30m
Frontier
Deal found 4/30![Frontier logo]()
$206
This Expedia deal was found by Cheapflights users on 4/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/271:39 pm
ONT
- PHL
1 stop12h 31m
Frontier
Tue 6/28:35 pm
PHL
- ONT
1 stop30h 14m
Frontier
Deal found 4/29![Frontier logo]()
$210
This Frontier deal was found by Cheapflights users on 4/30. 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.
Wed 5/274:39 pm
ONT
- IAD
1 stop12h 33m
Frontier
Tue 6/29:12 am
IAD
- ONT
1 stop13h 20m
Frontier
Deal found 4/30![Frontier logo]()
$210
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 May 4, 2026.
Search for one-way flight options from Ontario to Maryland. Find affordable one-way fares based on user searches. Data last updated May 4, 2026.
This Gotogate deal was found by Cheapflights users on 4/30. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/2410:50 am
ONT
- DCA
1 stop8h 08m
Frontier
Deal found 4/30![Frontier logo]()
$80
This Super.com deal was found by Cheapflights users on 4/29. 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.
Wed 5/204:39 pm
ONT
- IAD
1 stop12h 33m
Frontier
Deal found 4/29![Frontier logo]()
$85
This Trip.com deal was found by Cheapflights users on 4/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
ONT
- PHL
1 stop20h 37m
Frontier
Deal found 4/30![Frontier logo]()
$86
This Super.com deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” 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.
Tue 6/96:00 am
ONT
- DCA
1 stop7h 57m
Frontier
Deal found 5/1![Frontier logo]()
$104
This Super.com deal was found by Cheapflights users on 4/30. 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.
Mon 5/188:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Deal found 4/30![Frontier logo]()
$105
This Super.com deal was found by Cheapflights users on 5/2. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/206:00 am
ONT
- PHL
1 stop20h 37m
Frontier
Deal found 5/2![Frontier logo]()
$105
This CheapOair deal was found by Cheapflights users on 4/30. 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.
Fri 5/158:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Deal found 4/30![Frontier logo]()
$106
This Frontier deal was found by Cheapflights users on 4/29. 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.
Tue 5/196:00 am
ONT
- DCA
1 stop12h 58m
Frontier
Deal found 4/29![Frontier logo]()
$106
This Trip.com deal was found by Cheapflights users on 4/30. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/76:00 am
ONT
- DCA
1 stop7h 59m
Frontier
Deal found 4/30![Frontier logo]()
$108
This Super.com deal was found by Cheapflights users on 5/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/93:34 pm
ONT
- PHL
1 stop11h 53m
Frontier
Deal found 5/3![Frontier logo]()
$109
This Super.com deal was found by Cheapflights users on 4/30. 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.
Wed 6/246:00 am
ONT
- DCA
1 stop27h 57m
Frontier
Deal found 4/30![Frontier logo]()
$110
This Mytrip deal was found by Cheapflights users on 4/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/28:06 pm
ONT
- BWI
1 stop21h 12m
Frontier
Deal found 4/30![Frontier logo]()
$111
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 May 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $179 (Trip.com) |
One-way from | $80 (Gotogate) |
Popular in | March |
Cheapest in | August |
Average price | $360 |
Good round-trip deal | $462 or less |
Good one-way deal | $224 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 May 4, 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
Mon 8/17
10:00 pm-9:19 am
1 stop8h 19m
Washington, D.C. Dulles Intl
Thu 8/20
12:30 pm-6:29 pm
1 stop8h 59m
$321
OntarioWashington, D.C.
ONT - DCA
ONTDCA
Ontario
Wed 9/16
12:00 pm-11:24 pm
1 stop8h 24m
Washington, D.C. Reagan-National
Tue 9/29
6:00 am-6:01 pm
2 stops15h 01m
$326
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 9/28
9:39 am-9:15 pm
1 stop8h 36m
Philadelphia
Thu 10/1
3:48 pm-8:52 pm
1 stop8h 04m
$327
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Wed 9/23
1:50 pm-11:50 pm
1 stop7h 00m
Philadelphia
Mon 9/28
10:20 am-4:10 pm
1 stop8h 50m
$343
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 7/14
2:50 pm-1:00 am
1 stop7h 10m
Philadelphia
Tue 7/21
4:35 pm-10:45 pm
2 stops9h 10m
$354
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 8/17
10:59 pm-9:38 am
1 stop7h 39m
Philadelphia
Thu 8/27
6:45 am-11:04 am
1 stop7h 19m
$357
OntarioWashington, D.C.
ONT - IAD
ONTIAD
Ontario
Fri 8/14
10:59 pm-9:50 am
1 stop7h 51m
Washington, D.C. Dulles Intl
Tue 8/18
6:00 am-11:04 am
1 stop8h 04m
$359
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Tue 6/2
4:03 pm-5:35 am
1 stop10h 32m
Philadelphia
Wed 6/3
4:45 pm-11:56 pm
1 stop10h 11m
$361
OntarioPhiladelphia
ONT - PHL
ONTPHL
Ontario
Mon 9/28
5:15 am-5:55 pm
2 stops9h 40m
Philadelphia
Thu 10/1
4:40 pm-10:35 pm
1 stop8h 55m
$366
OntarioWashington, D.C.
ONT - IAD
ONTIAD
Ontario
Wed 9/30
3:12 pm-5:40 am
1 stop11h 28m
Washington, D.C. Dulles Intl
Sun 10/4
7:00 am-2:47 pm
1 stop10h 47m
$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-PHL
ONT-BWI
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-PHL
ONT-BWI
How far ahead should I book a flight from Ontario to Maryland?
The best time to book flights from Ontario to Maryland is 46 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from Ontario to Maryland?
Currently, June is the cheapest month in which you can book a flight from Ontario to Maryland (average of $72). 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 May 4, 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 May 4, 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?
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 May 4, 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
Comfort
8.0
Crew
8.6
Overall
7.9
Food
7.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
7.9
Food
7.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
7.9
Food
7.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
7.9
Food
7.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
7.9
Food
7.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Entertainment
7.5
Comfort
8.0
Crew
8.6
Overall
7.9
Food
7.0
Boarding
8.1
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Related info for your journey
Find useful and relevant information for your journey from Ontario to Maryland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
Alternative routes for Ontario to Maryland
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Maryland by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Maryland by cabin class
Find flights from Ontario to Maryland, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Maryland flights
Browse other Ontario and Maryland flight options. Last updated on May 4, 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 May 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$128 | Average$356 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$136 | Average$252 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$256 | Average$393 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$339 | Average$486 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$351 | Average$544 | FlexibilityNo cancel fee | On-time71% |