$63+ Cheap flights from Ontario (ONT) to Dulles Intl (IAD)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — IAD
Nov 23 — Nov 301
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Ontario to Dulles Intl 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 Dulles Intl
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to Dulles IntlExplore the most affordable flight options available from Ontario to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 24, 2026.
Explore the most affordable flight options available from Ontario to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 24, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/212:01 pm -
1 stop12h 09m
Mon 11/231:09 pm -
1 stop25h 30m
Deal found 10/21![Frontier logo]()
$133
This Mytrip deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” 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 11/168:35 pm -
2 stops12h 01m
Wed 11/1812:31 pm -
2 stops25h 45m
Deal found 10/23![Frontier logo]()
$137
This Mytrip deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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.
Wed 11/1810:35 am -
2 stops22h 01m
Mon 11/231:09 pm -
1 stop9h 27m
Deal found 10/21![Frontier logo]()
$145
This Expedia deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 11/212:01 pm -
1 stop12h 09m
Sun 11/221:09 pm -
1 stop21h 11m
Deal found 10/21![Frontier logo]()
$152
This Mytrip deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” 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.
Wed 11/1810:35 am -
2 stops22h 01m
Sun 11/221:09 pm -
1 stop21h 11m
Deal found 10/22![Frontier logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1710:35 am -
2 stops22h 01m
Sun 11/221:09 pm -
1 stop21h 11m
Deal found 10/24![Frontier logo]()
$161
This Mytrip deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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.
Fri 12/42:00 pm -
2 stops27h 10m
Mon 12/710:35 pm -
2 stops15h 10m
Deal found 10/24![Frontier logo]()
$165
This Mytrip deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” 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.
Thu 11/128:03 pm -
1 stop12h 33m
Tue 11/1712:31 pm -
2 stops24h 09m
Deal found 10/22![Frontier logo]()
$167
This Mytrip deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” 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.
Wed 11/115:33 pm -
1 stop15h 03m
Tue 11/1712:31 pm -
2 stops24h 09m
Deal found 10/22![Frontier logo]()
$173
Best flights from Ontario to Dulles IntlDiscover carefully curated flight deals from Ontario to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 24, 2026.
Discover carefully curated flight deals from Ontario to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 24, 2026.
This Alaska Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” 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 12/115:01 pm -
1 stop9h 34m
Mon 12/145:18 pm -
1 stop20h 55m
Deal found 10/23![Alaska Airlines logo]()
$275
This KAYAK deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” 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.
Mon 12/711:57 am -
1 stop9h 34m
Wed 12/93:00 pm -
1 stop8h 58m
Deal found 10/22![Delta logo]()
$326
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” 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 2/131:45 pm -
1 stop6h 38m
Sat 2/202:36 pm -
1 stop10h 23m
Deal found 10/22![United Airlines logo]()
$373
This Alaska Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” 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 11/124:09 pm -
1 stop10h 35m
Mon 11/167:46 am -
1 stop10h 27m
Deal found 10/22![Alaska Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 1/231:20 pm -
1 stop7h 11m
Wed 1/277:00 am -
1 stop10h 50m
Deal found 10/24![Delta logo]()
$371
This United Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 12/171:38 pm -
1 stop8h 21m
Mon 1/112:39 pm -
1 stop10h 36m
Deal found 10/21![United Airlines logo]()
$373
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” 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 12/85:00 am -
1 stop9h 19m
Mon 12/144:21 pm -
1 stop7h 50m
Deal found 10/22![United Airlines logo]()
$373
This Delta deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” 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 11/911:10 pm -
1 stop6h 59m
Sun 11/156:00 am -
1 stop8h 03m
Deal found 10/23![Delta logo]()
$375
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” 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 12/165:00 am -
1 stop9h 19m
Tue 1/122:11 pm -
1 stop9h 49m
Deal found 10/22![United Airlines logo]()
$373
This Delta deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 12/111:11 pm -
1 stop7h 36m
Mon 12/147:00 am -
1 stop8h 17m
Deal found 10/24![Delta logo]()
$386
This United Airlines deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” 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 12/55:00 am -
1 stop9h 19m
Wed 12/92:24 pm -
1 stop10h 35m
Deal found 10/20![United Airlines logo]()
$373
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” 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 12/105:45 am -
1 stop9h 38m
Sat 1/164:15 pm -
1 stop7h 45m
Deal found 10/22![United Airlines logo]()
$373
Last-minute flights from Ontario to Dulles IntlDiscover last-minute flight deals from Ontario to Dulles Intl. Data last updated October 24, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Dulles Intl. Data last updated October 24, 2026 and is based on user searches.
This Mytrip deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” 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.
Wed 11/115:33 pm -
1 stop15h 03m
Tue 11/1712:31 pm -
2 stops24h 09m
Deal found 10/22![Frontier logo]()
$173
This Mytrip deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” 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.
Thu 11/128:03 pm -
1 stop12h 33m
Tue 11/1712:31 pm -
2 stops24h 09m
Deal found 10/22![Frontier logo]()
$167
This Mytrip deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” 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 11/168:35 pm -
2 stops12h 01m
Wed 11/1812:31 pm -
2 stops25h 45m
Deal found 10/23![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1710:35 am -
2 stops22h 01m
Sun 11/221:09 pm -
1 stop21h 11m
Deal found 10/24![Frontier logo]()
$161
This Mytrip deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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.
Wed 11/1810:35 am -
2 stops22h 01m
Mon 11/231:09 pm -
1 stop9h 27m
Deal found 10/21![Frontier logo]()
$145
This Mytrip deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” 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.
Wed 11/1810:35 am -
2 stops22h 01m
Sun 11/221:09 pm -
1 stop21h 11m
Deal found 10/22![Frontier logo]()
$160
This Cheapflightsfares deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/212:01 pm -
1 stop12h 09m
Mon 11/231:09 pm -
1 stop25h 30m
Deal found 10/21![Frontier logo]()
$133
This Expedia deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 11/212:01 pm -
1 stop12h 09m
Sun 11/221:09 pm -
1 stop21h 11m
Deal found 10/21![Frontier logo]()
$152
One-way flights from Ontario to Dulles IntlSearch for one-way flight options from Ontario to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated October 24, 2026.
Search for one-way flight options from Ontario to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated October 24, 2026.
This Booking.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 11/175:07 pm -
2 stops15h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$63
This Mytrip deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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.
Wed 11/1810:35 am -
2 stops22h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$66
This Super.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 11/2410:40 pm -
1 stop27h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$72
This Super.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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 11/212:01 pm -
1 stop12h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$73
This Trip.com deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” 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 11/2510:55 am -
1 stop15h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Frontier logo]()
$75
This Mytrip deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” 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.
Fri 12/112:53 pm -
2 stops26h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Frontier logo]()
$76
This Super.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” 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.
Sun 11/2210:40 pm -
1 stop27h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$82
This Booking.com deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” 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 12/1910:51 pm -
1 stop28h 16m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Frontier logo]()
$85
This Mytrip deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” 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 11/168:35 pm -
2 stops12h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/24![Frontier logo]()
$88
Find flight deals from Ontario to Dulles Intl
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 24, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $133 (Cheapflightsfares) |
One-way from | $63 (Booking.com) |
Popular in | April |
Cheapest in | February |
Average price | $504 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Dulles Intl 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 7,457,451 searches. Data last updated October 24, 2026.
Use the filters below to find and compare flights from Ontario to Washington, D.C. Dulles Intl Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Mon 12/21
3:59 pm-5:45 am
1 stop10h 46m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$122
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Mon 11/30
11:10 pm-9:16 am
1 stop7h 06m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$129
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Mon 12/14
11:08 pm-9:16 am
1 stop7h 08m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$129
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Sat 12/5
12:20 pm-12:41 am
1 stop9h 21m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$129
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Thu 12/3
1:11 pm-11:47 pm
1 stop7h 36m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$129
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Sat 11/14
5:00 am-3:44 pm
1 stop7h 44m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$186
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Mon 12/21
11:52 pm-10:02 am
1 stop7h 10m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$186
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Wed 3/3
6:35 pm-6:00 am
1 stop8h 25m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$187
Quickest round-trip
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Sat 12/5
1:40 pm-11:15 pm
1 stop6h 35m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$187
OntarioWashington, D.C.
ONT Ontario - IAD Washington, D.C. Dulles Intl
ONTIAD
Ontario
Sun 1/3
11:52 pm-11:54 am
1 stop9h 02m
Washington, D.C. Dulles Intl
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$211
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from Ontario to Dulles Intl
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Dulles Intl in October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Ontario to Dulles Intl
Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Ontario with our price prediction graph.
ONT-IAD
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Ontario to Washington, D.C. Dulles Intl Airport
What is the cheapest month to book a flight from Ontario to Washington, D.C. Dulles Intl Airport?
Currently, February is the cheapest month in which you can book a flight from Ontario to Washington, D.C. Dulles Intl Airport (average of $448). Flying from Ontario to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $984). 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.
How much does it cost to fly round-trip from Ontario to Washington, D.C. Dulles Intl Airport?
Airfare is below average for this route at the moment.
Ontario to Washington, D.C. Dulles Intl Airport flights typically cost between $472 and $730 in November.The cheapest round-trip price found within the last 5 days was $133 on Frontier (Nov 21-Nov 23).
Reviews of airlines servicing Dulles Intl
Get insights into the airlines that provide service to Dulles Intl. 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 Dulles Intl. Reviews last updated October 24, 2026.
Read reviews from past customers who have flown Southwest,Delta, andUnited Airlines from Ontario to Washington, D.C. Dulles Intl Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.4
Overall
7.9
Crew
8.6
Boarding
8.1
Food
7.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.4
Overall
7.9
Crew
8.6
Boarding
8.1
Food
7.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.4
Overall
7.9
Crew
8.6
Boarding
8.1
Food
7.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.4
Overall
7.9
Crew
8.6
Boarding
8.1
Food
7.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.4
Overall
7.9
Crew
8.6
Boarding
8.1
Food
7.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.4
Overall
7.9
Crew
8.6
Boarding
8.1
Food
7.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Related info for your journey
Find useful and relevant information for your journey from Ontario to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Washington, D.C. Dulles Intl Airport?
Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locationsAlexandria
Chantilly
Woodbridge
Arlington
Owings Mills
Lanham
Sterling
Reston
Herndon
Hyattsville
Rockville
Springfield
Fredericksburg
Falls Church
Tysons
Towson
Oxon Hill
Laurel
Clinton
Hunt Valley
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
Dulles Intl flight routes
Flights by cabin class
Other flight options
Other flights from Ontario
Popular flights
Alternative routes for Ontario to Dulles Intl
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Dulles Intl by adding a car rental and/or hotel reservation to your travel itinerary.
Other flights to Dulles Intl
Explore flights to Dulles Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 24, 2026.
Search flights from Ontario to Dulles Intl by cabin class
Find flights from Ontario to Dulles Intl, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Dulles Intl flights
Browse other Ontario and Dulles Intl flight options. Last updated on October 24, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on October 24, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 5 airlines flying from Ontario to Dulles Intl
Discover the top 5 airlines that operate flights from Ontario to Dulles Intl. 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 7,457,451 searches. Data last updated October 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$192 | Average$399 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$318 | Average$452 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$318 | Average$543 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$367 | Average$620 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$368 | Average$533 | FlexibilityNo cancel fee | On-time63% |