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Uncover the best deals on Ontario to Washington flights by comparing fares from hundreds of airlines and agencies.
Good to Know: Cheapest and Fastest ONT - IAD Flights
Useful information for finding best airline tickets from Ontario International to Washington Dulles International on your next trip.
Cheapest Round Trip Flight
$296
Alaska Airlines
• 1 stop
• 16h 53m
Aug 06 – Aug 08
The cheapest round trip flight from Ontario to Washington (ONT-IAD-ONT) is currently $296
Cheapest One way Flight
$186
Delta Airlines
• 1 stop
• 15h 34m
Aug 06
The cheapest one way flight from Ontario to Washington (ONT-IAD) is currently $186
Cheapest Direct Flight
$354
United Airlines
• nonstop
•
Jul 31
The cheapest nonstop flight from Ontario to Washington (ONT-IAD) is currently $354
Fastest Flight
13h 40m
The fastest nonstop flight from Ontario to Washington (ONT-IAD) takes 13h 40m
Top Airlines Flying from Ontario to Washington
Latest Flight Deals from Ontario (ONT) to Washington (IAD)
Compare and book low fare round-trip air tickets from Ontario to Washington. Ideal for travelers with confirmed return itineraries.
Aug 06 - Aug 08, Economy
Ontario → Washington
16h 53m
5:26 PM - 6:39 AM • 1 stop
Ontario → Washington
8h 48m
9:59 AM - 12:27 PM • nonstop
Alaska Airlines
Aug 06 - Aug 08, Economy
Ontario → Washington
16h 53m
5:26 PM - 6:39 AM • 1 stop
Ontario → Washington
20h 22m
6:03 AM - 3:25 PM • 1 stop
Alaska Airlines
Aug 06 - Aug 08, Economy
Ontario → Washington
13h 40m
10:00 PM - 9:20 AM • 1 stop
Ontario → Washington
11h 52m
2:18 PM - 6:30 PM • 1 stop
Delta Airlines
Aug 06 - Aug 08, Economy
Ontario → Washington
16h 53m
5:26 PM - 6:39 AM • 1 stop
Ontario → Washington
25h 3m
6:03 AM - 6:06 PM • 2 stops
Alaska Airlines
Aug 07 - Aug 09, Economy
Ontario → Washington
16h 53m
5:26 PM - 6:39 AM • 1 stop
Ontario → Washington
16h 46m
6:03 AM - 1:09 PM • 1 stop
Alaska Airlines
Explore competitive one-way airfare options for ONT - IAD flights. Best suited for flexible or open-ended travel plans.
Flying to Washington soon? We've surfaced some of the most affordable last-minute flights from Ontario to Washington, ideal for urgent plans or spontaneous trips.
Aug 06 - Aug 08, Economy
Ontario → Washington
16h 53m
5:26 PM - 6:39 AM • 1 stop
Ontario → Washington
20h 22m
6:03 AM - 3:25 PM • 1 stop
Alaska Airlines
Aug 06 - Aug 08, Economy
Ontario → Washington
16h 53m
5:26 PM - 6:39 AM • 1 stop
Ontario → Washington
25h 3m
6:03 AM - 6:06 PM • 2 stops
Alaska Airlines
Looking for the fastest way to Washington? These direct flight options from ONT to IAD offer both convenience and value—no layovers, just straight to your destination.
Jul 31 - Sep 03, Economy
Ontario → Washington
- • nonstop
Ontario → Washington
- • nonstop
United Airlines
Jul 31 - Sep 03, Economy
Ontario → Washington
- • nonstop
Ontario → Washington
- • nonstop
United Airlines
Jul 31 - Sep 03, Economy
Ontario → Washington
- • nonstop
Ontario → Washington
- • nonstop
United Airlines
Jul 31 - Sep 03, Economy
Ontario → Washington
- • nonstop
Ontario → Washington
- • nonstop
United Airlines
Jul 31 - Sep 03, Economy
Ontario → Washington
- • nonstop
Ontario → Washington
- • nonstop
United Airlines
FAQs on Ontario to Washington Flights
What are the airports in Ontario?
ONT
What’s the most popular airline flying from ONT to IAD?
The most popular airline flying from Ontario to Washington are
Can I fly from ONT to IAD non-stop?
Yes, you can fly ONT to IAD non-stop on
Which airlines fly nonstop between Ontario and Washington?
The non-stop flights between Ontario and Washington are .
What’s the earliest departure time from ONT to IAD Airport?
The earliest flight leaves ONT at 6:02 am and lands in IAD - Washington Dulles International
What are the airports in Washington?
IAD,BWI,DCA
Can I make changes to my Ontario to Washington flight tickets or cancel them on FareLeaders.com?
No. We are an airfare comparison site. All the tickets are booked by the travel agent offering the flight deal and any changes or cancellations to be made are directly done directly by them or the airlines.
Can I cancel my flight tickets from ONT to IAD?
Read the fare rules of the Ontario to Washington air tickets booked. Some airlines allow you to cancel the tickets within a stipulated time period with a cancellation fee.
Which airline alliances offer flights from Ontario and Washington?
operate flights between Ontario and Washington
How long does a flight from Ontario to Washington take?
It takes approximately 5 hour to fly non-stop from ONT to IAD, which is 2241.85 miles by air.
Which airlines provide the cheapest flights from Ontario (ONT) to Washington (IAD) ?
In the past couple of days, the cheapest tickets to IAD from ONT were found on AS : USD 383
Do I need a passport to fly between ONT and IAD?
No
What’s the latest departure time from ONT to IAD ?
The last flight leaves ONT at 11:3000 pm
Essential Information for Booking Flights from Ontario (ONT) - AI Insights
What's the cheapest airline from ont to iad?
You can find affordable Business class flights from Ontario International Airport (ONT) to Washington Dulles International Airport (IAD) on Frontier Airlines. For a one-way trip, book in advance to secure the best rates. With 58 days of lead time, you can enjoy Low Fares and Budget-friendly options.
What's the popular airline to fly from ont to iad?
You can fly from Ontario International Airport (ONT) to Washington Dulles International Airport (IAD) on United Airlines (UA), which offers premium business class service with priority, lounge access, and flatbed seats. Booking in advance is recommended, as you've done by booking 58 days prior to your trip. This will help you secure the best available airfare for your one-way journey.
What's the cheapest day of the week to fly from ont to iad?
The cheapest day to fly from Ontario International Airport (ONT) to Washington Dulles International Airport (IAD) is Tuesday. Flying on Tuesdays can help you save on airfare costs, making it a budget-friendly option for your one-way trip.
What's the cheapest month to fly from ont to iad?
The cheapest month to fly from Ontario International Airport (ONT) to Washington Dulles International Airport (IAD) is September. This is based on historical data, which suggests that September tends to have lower airfares compared to other months. Booking in advance, with at least 58 days prior to your trip, can also help you secure cheaper flights.
Which airline/airlines fly from ont to iad?
You can fly from Ontario International Airport (ONT) to Washington Dulles International Airport (IAA) on the following airlines: Delta Airlines, Avianca, Southwest Airlines, Volaris Airline, Frontier Airlines, JetBlue Airways, United Airlines, American Airlines, and Alaska Airlines.
What is the cheapest airfare available on Ontario International airport to Washington Dulles International airport for a one-way trip?
You can find the cheapest airfare on Frontier Airlines (F9) for your one-way trip from Ontario International to Washington Dulles International airport.
How many advance booking days do I need to book my flight from Ontario International to Washington Dulles International airport?
For a one-way trip, you should book your flight at least 58 advance booking days in advance.
Can I find cheap flights on airlines operating out of Ontario International airport?
Yes, you can compare fares and find the cheapest flights on fareleaders.com website for airlines such as Delta Airlines (DL), Avianca (AV), Southwest Airlines (WN), Volaris Airline (Y4), Frontier Airlines (F9), JetBlue Airways (B6), United Airlines (UA), American Airlines (AA), Alaska Airlines (AS).
What is the best time to book airfare for a one-way trip from Ontario International to Washington Dulles International airport?
The cheapest time to book airfare for your one-way trip is in September.
Are there any discounts or promotions available on airflights from Ontario International to Washington Dulles International airport?
Yes, you can find discounts and promotions on airflights from Ontario International to Washington Dulles International airport via fareleaders.com website.
How do I compare fares and find the cheapest flights on fareleaders.com website?
You can compare fares and find the cheapest flights by using our fare comparison tool on fareleaders.com website.
Can I book my flight via agencia (agency) for a one-way trip from Ontario International to Washington Dulles International airport?
No, you cannot book your flight via agencia (agency) for a one-way trip from Ontario International to Washington Dulles International airport.
Ontario (ONT) to Washington (IAD): Airport Information
| Origin Airport | Ontario International , Ontario, US |
| Destination Airport | Washington Dulles International , Washington, US |
| Distance | 2242 miles |
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