What are the cheapest airlines to fly from Washington, D.C. to Region of Ontario one-way?

$81 is the cheapest one-way deal found within the past few days, from Porter Airlines. You may also be able to find cheap deals on American Airlines and United Airlines, with prices starting from $81 and $81, respectively.

What are the most popular routes from Washington, D.C. to Region of Ontario?

The most popular flight routes from Washington, D.C. to Region of Ontario are Washington, D.C. Dulles Intl - Toronto Pearson Intl, Washington, D.C. Reagan-National - Toronto Pearson Intl and Washington, D.C. Dulles Intl - Montreal Pierre Elliott Trudeau Intl.

What are the cheapest flights from Washington, D.C. to Region of Ontario?

On average you can expect to pay $856 for a flight from Washington, D.C. to Region of Ontario. The cheapest flight overall is $76 while the most popular route, (Washington, D.C. Dulles Intl - Toronto Pearson Intl) is currently priced at $212.

What are the most reliable airlines from Washington, D.C. to Region of Ontario?

Before booking your flight to Region of Ontario from Washington, D.C., check out the most reliable airlines to get you to your destination on time: ANA (87%), Republic Airways (80%), Air Canada( 80%).

What are the most popular airlines that fly from Washington, D.C. to Region of Ontario?

When booking a flight from Washington, D.C. to Region of Ontario, you may want to consider flying on Air Canada, Porter Airlines or United Airlines as they are the most popular for this route.

How far in advance should I book a flight from Washington, D.C. to Region of Ontario?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 44 days in advance, which can save you up to 121% on flights from Washington, D.C. to Region of Ontario compared to booking the week you need them. Waiting 44 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $332. For sooner than that we have options available in the next 3 days from $611.

What is the cheapest month to fly from Washington, D.C. to Region of Ontario?

March can be a great time to fly to Region of Ontario from Washington, D.C. with a flight ticket averaging about $297. Cheapflights users have found deals in the month of March for as cheap as $169. The most expensive prices can be found in the month of August.

Can I find deals for flights from Washington, D.C. to Ontario that include hotel bookings?

Yes. In addition to deals on Washington, D.C. to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Washington, D.C. to Ontario?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Ontario.

Can I find deals for business class flights from Washington, D.C. to Ontario?

Yes. Cheapflights offers flight deals from Washington, D.C. to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$81+ Flights from Washington, D.C. to Ontario - Compare & Save Big

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Washington, D.C. to Ontario 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 Washington, D.C. to Ontario

Most accurate provider	Mytrip 3 stars
Most trusted provider	Mytrip 3 stars
Round-trip from	$184 (Kiwi.com)
One-way from	$81 (FlightHub)
Popular in	August
Cheapest in	March
Average price	$286
Good round-trip deal	$195 or less
Good one-way deal	$109 or less

Provider with most accurate pricing for Washington, D.C. (WAS)-Toronto (YTO) flight deals.

Search Deals

Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Toronto (YTO) flights.

Search Deals

From Washington, D.C. (WAS) to Ontario

Search Deals

One-way flight from Washington, D.C. (WAS) to Ontario

Search Deals

Highest demand for flights based on searches. 2% potential increase in price ($8 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

Price to beat on a round-trip flight from Washington, D.C. (WAS) to Ontario.

Search Deals

Price to beat on a one-way flight from Washington, D.C. (WAS) to Ontario.

Search Deals

Find flight deals from Washington, D.C. to Ontario

Cheapest flights from Washington, D.C. to Ontario
Explore the most affordable flight options available from Washington, D.C. to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 30, 2025.

Tue 5/274:20 pmIAD - YTZ

Nonstop1h 33mPorter Airlines

Sat 5/311:35 pmYTZ - IAD

Nonstop1h 31mPorter Airlines

Deal found 4/28

$184

Tue 6/33:30 pmIAD - YYZ

Nonstop1h 39mAir Canada

Tue 6/177:47 pmYYZ - IAD

Nonstop1h 40mAir Canada

Deal found 4/28

$189

Tue 6/34:20 pmIAD - YTZ

Nonstop1h 33mMultiple Airlines

Wed 6/41:35 pmYTZ - IAD

Nonstop1h 31mMultiple Airlines

Deal found 4/27

$193

Tue 6/310:00 amDCA - YYZ

Nonstop1h 55mAmerican Airlines

Tue 6/35:29 pmYYZ - DCA

Nonstop1h 40mAmerican Airlines

Deal found 4/28

$212

Tue 6/33:30 pmIAD - YYZ

Nonstop1h 39mUnited Airlines

Wed 6/410:05 amYYZ - IAD

Nonstop1h 34mUnited Airlines

Deal found 4/27

$212

Wed 6/256:59 amDCA - YYZ

Nonstop1h 34mAir Canada

Wed 6/2511:00 amYYZ - DCA

1 stop4h 48mAir Canada

Deal found 4/28

$216

Tue 6/1012:55 pmDCA - YTZ

1 stop5h 42mAir Canada

Tue 6/173:25 pmYTZ - DCA

1 stop6h 28mAir Canada

Deal found 4/28

$216

Tue 6/39:40 amDCA - YYZ

1 stop4h 07mUnited Airlines

Tue 6/34:30 pmYYZ - DCA

Nonstop1h 33mUnited Airlines

Deal found 4/29

$225

Tue 6/171:40 pmDCA - YYZ

1 stop4h 19mDelta

Fri 6/206:49 pmYYZ - DCA

1 stop4h 10mDelta

Deal found 4/28

$237

Tue 6/176:00 amIAD - YYZ

1 stop5h 18mDelta

Fri 6/203:31 pmYYZ - IAD

1 stop7h 24mDelta

Deal found 4/28

$237

Wed 5/289:45 amIAD - YTZ

1 stop5h 05mAir Canada

Sun 6/14:20 pmYTZ - IAD

1 stop4h 44mAir Canada

Deal found 4/28

$243

Mon 7/74:20 pmIAD - YUL

1 stop3h 50mPorter Airlines

Thu 7/1710:45 amYUL - IAD

1 stop4h 21mPorter Airlines

Deal found 4/28

$252

Best flights from Washington, D.C. to Ontario
Discover carefully curated flight deals from Washington, D.C. to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 30, 2025.

Wed 6/184:20 pmIAD - YTZ

Nonstop1h 33mPorter Airlines

Wed 6/251:35 pmYTZ - IAD

Nonstop1h 31mPorter Airlines

Deal found 4/29

$184

Tue 6/33:30 pmIAD - YYZ

Nonstop1h 39mAir Canada

Tue 6/177:47 pmYYZ - IAD

Nonstop1h 40mAir Canada

Deal found 4/28

$189

Tue 6/104:20 pmIAD - YTZ

Nonstop1h 33mMultiple Airlines

Tue 6/174:20 pmYTZ - IAD

1 stop4h 44mMultiple Airlines

Deal found 4/29

$212

Tue 6/310:00 amDCA - YYZ

Nonstop1h 55mAmerican Airlines

Wed 6/411:05 amYYZ - DCA

Nonstop1h 35mAmerican Airlines

Deal found 4/27

$212

Tue 6/33:30 pmIAD - YYZ

Nonstop1h 39mUnited Airlines

Wed 6/410:05 amYYZ - IAD

Nonstop1h 34mUnited Airlines

Deal found 4/27

$212

Tue 6/171:40 pmDCA - YYZ

1 stop4h 19mDelta

Wed 6/186:14 pmYYZ - DCA

1 stop5h 19mDelta

Deal found 4/28

$237

Wed 6/256:00 amIAD - YYZ

1 stop3h 22mWestJet

Wed 6/2511:39 amYYZ - IAD

1 stop4h 54mWestJet

Deal found 4/28

$292

Sat 5/104:20 pmIAD - YTZ

Nonstop1h 33mAir Transat

Sat 5/171:35 pmYTZ - IAD

Nonstop1h 31mAir Transat

Deal found 4/29

$362

Sat 5/242:54 pmDCA - YYZ

Nonstop1h 50mBritish Airways

Sun 5/2511:05 amYYZ - DCA

Nonstop1h 35mBritish Airways

Deal found 4/28

$368

Wed 6/256:59 amDCA - YYZ

Nonstop1h 34mAir Canada

Wed 6/2511:00 amYYZ - DCA

1 stop4h 48mAir Canada

Deal found 4/28

$216

Tue 6/39:40 amDCA - YYZ

1 stop4h 07mUnited Airlines

Tue 6/34:30 pmYYZ - DCA

Nonstop1h 33mUnited Airlines

Deal found 4/29

$225

Tue 6/176:00 amIAD - YYZ

1 stop5h 18mDelta

Fri 6/203:31 pmYYZ - IAD

1 stop7h 24mDelta

Deal found 4/28

$237

Last-minute flights from Washington, D.C. to Ontario
Discover last-minute flight deals from Washington, D.C. to Ontario. Data last updated April 30, 2025 and is based on user searches.

Tue 5/64:20 pmIAD - YTZ

Nonstop1h 33mPorter Airlines

Tue 5/131:35 pmYTZ - IAD

Nonstop1h 31mPorter Airlines

Deal found 4/27

$313

Tue 5/610:19 pmIAD - YYZ

Nonstop1h 35mAir Canada

Tue 5/136:15 amYYZ - IAD

Nonstop1h 40mAir Canada

Deal found 4/27

$365

Tue 5/69:45 amIAD - YTZ

1 stop5h 05mAir Canada

Tue 5/133:25 pmYTZ - IAD

1 stop5h 43mAir Canada

Deal found 4/27

$369

Tue 5/66:59 amDCA - YYZ

Nonstop1h 33mUnited Airlines

Mon 5/126:10 pmYYZ - DCA

Nonstop1h 33mUnited Airlines

Deal found 4/28

$397

Tue 5/63:27 pmIAD - YYZ

Nonstop1h 42mUnited Airlines

Mon 5/1212:45 pmYYZ - IAD

Nonstop1h 34mUnited Airlines

Deal found 4/28

$397

Wed 5/74:20 pmIAD - YTZ

Nonstop1h 33mMultiple Airlines

Tue 5/131:35 pmYTZ - IAD

Nonstop1h 31mMultiple Airlines

Deal found 4/28

$310

Wed 5/72:54 pmDCA - YYZ

Nonstop1h 50mAmerican Airlines

Tue 5/1311:05 amYYZ - DCA

Nonstop1h 35mAmerican Airlines

Deal found 4/28

$365

Wed 5/76:00 amDCA - YYZ

1 stop4h 39mAir Canada

Tue 5/138:55 pmYYZ - DCA

Nonstop1h 33mAir Canada

Deal found 4/28

$370

Thu 5/812:55 pmDCA - YTZ

1 stop5h 42mAir Canada

Sun 5/113:25 pmYTZ - DCA

1 stop6h 28mAir Canada

Deal found 4/28

$383

Thu 5/84:20 pmIAD - YUL

1 stop5h 55mPorter Airlines

Sun 5/1810:45 amYUL - IAD

1 stop4h 21mPorter Airlines

Deal found 4/29

$389

Fri 5/911:35 amIAD - YOW

1 stop4h 58mPorter Airlines

Tue 5/138:35 amYOW - IAD

1 stop6h 31mPorter Airlines

Deal found 4/28

$371

Fri 5/97:57 pmBWI - YYZ

1 stop18h 08mMultiple Airlines

Mon 5/124:00 pmYYZ - BWI

1 stop28h 29mMultiple Airlines

Deal found 4/29

$401

One-way flights from Washington, D.C. to Ontario
Search for one-way flight options from Washington, D.C. to Ontario. Find affordable one-way fares based on user searches. Data last updated April 30, 2025.

Tue 6/104:20 pmIAD - YTZ

Nonstop1h 33mPorter Airlines

Deal found 4/29

$81

Tue 5/2710:00 amDCA - YYZ

Nonstop1h 55mAmerican Airlines

Deal found 4/29

$81

Tue 5/273:30 pmIAD - YYZ

Nonstop1h 39mUnited Airlines

Deal found 4/29

$81

Tue 5/279:40 amDCA - YYZ

1 stop4h 07mUnited Airlines

Deal found 4/29

$91

Tue 6/244:20 pmIAD - YTZ

Nonstop1h 33mAir Transat

Deal found 4/28

$96

Tue 6/108:40 pmDCA - YYZ

Nonstop1h 33mAir Canada

Deal found 4/29

$103

Tue 6/102:25 pmIAD - YYZ

Nonstop1h 34mAir Canada

Deal found 4/29

$103

Tue 6/244:20 pmIAD - YTZ

Nonstop1h 33mAPG Airlines

Deal found 4/29

$105

Tue 5/274:35 pmDCA - YTZ

1 stop5h 00mAir Canada

Deal found 4/29

$108

Fri 5/309:40 amDCA - YYZ

1 stop7h 35mDelta

Deal found 4/29

$113

Sat 5/314:20 pmIAD - YUL

1 stop3h 50mPorter Airlines

Deal found 4/28

$118

Tue 8/51:03 pmIAD - YTZ

1 stop4h 43mAir Canada

Deal found 4/28

$118

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Tue 5/27

4:20 pm-5:53 pm

Nonstop1h 33m

Toronto Island

Sat 5/31

1:35 pm-3:06 pm

Nonstop1h 31m

$184

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Tue 6/3

3:30 pm-5:09 pm

Nonstop1h 39m

Toronto Pearson Intl

Tue 6/17

7:47 pm-9:27 pm

Nonstop1h 40m

$189

Washington, D.C.Toronto

IAD - YTZ

IADYTZ

Washington, D.C. Dulles Intl

Tue 6/3

4:20 pm-5:53 pm

Nonstop1h 33m

Toronto Island

Wed 6/4

1:35 pm-3:06 pm

Nonstop1h 31m

$193

Washington, D.C.Toronto

DCA - YYZ

DCAYYZ

Washington, D.C. Reagan-National

Tue 6/3

10:00 am-11:55 am

Nonstop1h 55m

Toronto Pearson Intl

Wed 6/4

11:05 am-12:40 pm

Nonstop1h 35m

$212

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Tue 6/3

3:30 pm-5:09 pm

Nonstop1h 39m

Toronto Pearson Intl

Wed 6/4

10:05 am-11:39 am

Nonstop1h 34m

$212

Washington, D.C.Toronto

DCA - YYZ

DCAYYZ

Washington, D.C. Reagan-National

Wed 6/25

6:59 am-8:33 am

Nonstop1h 34m

Toronto Pearson Intl

Wed 6/25

11:00 am-3:48 pm

1 stop4h 48m

$216

Washington, D.C.Toronto

DCA - YTZ

DCAYTZ

Washington, D.C. Reagan-National

Tue 6/10

12:55 pm-6:37 pm

1 stop5h 42m

Toronto Island

Tue 6/17

3:25 pm-9:53 pm

1 stop6h 28m

$216

Washington, D.C.Toronto

DCA - YYZ

DCAYYZ

Washington, D.C. Reagan-National

Tue 6/3

9:40 am-1:47 pm

1 stop4h 07m

Toronto Pearson Intl

Tue 6/3

4:30 pm-6:03 pm

Nonstop1h 33m

$225

Washington, D.C.Toronto

DCA - YYZ

DCAYYZ

Washington, D.C. Reagan-National

Tue 6/17

1:40 pm-5:59 pm

1 stop4h 19m

Toronto Pearson Intl

Wed 6/18

6:14 pm-11:33 pm

1 stop5h 19m

$237

Washington, D.C.Toronto

IAD - YYZ

IADYYZ

Washington, D.C. Dulles Intl

Tue 6/17

6:00 am-11:18 am

1 stop5h 18m

Toronto Pearson Intl

Wed 6/18

3:31 pm-10:55 pm

1 stop7h 24m

$237

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 60 results

...

Best time to book a flight from Washington, D.C. to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Washington, D.C. with our price prediction graph.

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 Washington, D.C. to Ontario

What is the cheapest month to book a flight from Washington, D.C. to Region of Ontario?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Region of Ontario (average of $243). Flying from Washington, D.C. to Region of Ontario in July is currently the most expensive (average of $359). 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 WAS to ON?

When flying from Washington, D.C. to Region of Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Washington, D.C. to Region of Ontario

The most flights from WAS to CAON are scheduled on a Monday (31 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (11 on average).

Rainfall in Ontario by month

In terms of precipitation, rainfall in Region of Ontario ranges from 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.

Temperature in Ontario by month

If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

Reviews of airlines servicing Ontario

See what other customers who have flown with Delta, Porter Airlines and Air Transat from Washington, D.C. to Ontario have to say. 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.

Delta

8.0

Very good

7,936 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very good

7,936 reviews

Delta

8.0

Very good

7,936 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Porter Airlines

8.0

Very good

285 reviews

Delta

8.0

Very good

7,936 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Air Transat

7.8

Good

385 reviews

Delta

8.0

Very good

7,936 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Copa Airlines

7.5

Good

1,411 reviews

Delta

8.0

Very good

7,936 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Aeromexico

7.5

Good

1,698 reviews

Delta

8.0

Very good

7,936 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

What are the cheapest airlines to fly from Washington, D.C. to Region of Ontario one-way?
$81 is the cheapest one-way deal found within the past few days, from Porter Airlines. You may also be able to find cheap deals on American Airlines and United Airlines, with prices starting from $81 and $81, respectively.
What are the most popular routes from Washington, D.C. to Region of Ontario?
The most popular flight routes from Washington, D.C. to Region of Ontario are Washington, D.C. Dulles Intl - Toronto Pearson Intl, Washington, D.C. Reagan-National - Toronto Pearson Intl and Washington, D.C. Dulles Intl - Montreal Pierre Elliott Trudeau Intl.
What are the most reliable airlines from Washington, D.C. to Region of Ontario?
Before booking your flight to Region of Ontario from Washington, D.C., check out the most reliable airlines to get you to your destination on time: ANA (87%), Republic Airways (80%), Air Canada( 80%).
What are the cheapest flights from Washington, D.C. to Region of Ontario?
On average you can expect to pay $856 for a flight from Washington, D.C. to Region of Ontario. The cheapest flight overall is $76 while the most popular route, (Washington, D.C. Dulles Intl - Toronto Pearson Intl) is currently priced at $212.
Can I find deals for flights from Washington, D.C. to Ontario that include hotel bookings?
Yes. In addition to deals on Washington, D.C. to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Washington, D.C. to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Ontario.
Can I find deals for business class flights from Washington, D.C. to Ontario?
Yes. Cheapflights offers flight deals from Washington, D.C. to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Washington, D.C. to Region of Ontario?
Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Region of Ontario (average of $243). Flying from Washington, D.C. to Region of Ontario in July is currently the most expensive (average of $359). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Top 7 airlines flying from Washington, D.C. to Ontario

Airline	Cheapest	Average	Flexibility	On-time
Porter Airlines	Cheapest$103	Average$344	FlexibilityNo cancel fee	On-time52%
Air Canada	Cheapest$116	Average$365	FlexibilityNo cancel fee	On-time67%
United Airlines	Cheapest$127	Average$405	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$145	Average$344	FlexibilityNo cancel fee	On-time71%
Air Transat	Cheapest$169	Average$329	FlexibilityNo cancel fee	On-time50%
Delta	Cheapest$242	Average$405	FlexibilityNo cancel fee	On-timeN/A
WestJet	Cheapest$278	Average$455	FlexibilityNo cancel fee	On-time60%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$81+ Cheap flights from Washington, D.C. (WAS) to Ontario

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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Washington, D.C. to Ontario with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Washington, D.C. to Ontario

Keep the following information in mind while searching for Washington, D.C. to Ontario flight deals. Data was last updated April 30, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Washington, D.C. to Ontario

Cheapest flights from Washington, D.C. to OntarioExplore the most affordable flight options available from Washington, D.C. to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 30, 2025.

Explore the most affordable flight options available from Washington, D.C. to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 30, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. to Ontario that are best for you.

Best time to book a flight from Washington, D.C. to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Washington, D.C. with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to Ontario

What is the cheapest month to book a flight from Washington, D.C. to Region of Ontario?

What is the cheapest time of day to fly from WAS to ON?

Find hourly flight availability from Washington, D.C. to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 30, 2025.

Weekly flight availability from Washington, D.C. to Region of Ontario

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

Reviews of airlines servicing Ontario

See what other customers who have flown with Delta, Porter Airlines and Air Transat from Washington, D.C. to Ontario have to say. 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.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines to fly from Washington, D.C. to Region of Ontario one-way?

What are the most popular routes from Washington, D.C. to Region of Ontario?

What are the most reliable airlines from Washington, D.C. to Region of Ontario?

What are the cheapest flights from Washington, D.C. to Region of Ontario?

Can I find deals for flights from Washington, D.C. to Ontario that include hotel bookings?

How can I find direct flights from Washington, D.C. to Ontario?

Can I find deals for business class flights from Washington, D.C. to Ontario?

What is the cheapest month to book a flight from Washington, D.C. to Region of Ontario?

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 for Washington, D.C. to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Top 7 airlines flying from Washington, D.C. to Ontario

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Washington, D.C. to Ontario
Explore the most affordable flight options available from Washington, D.C. to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 30, 2025.