Cheap flights from Washington, D.C. Dulles Intl Airport to Los Angeles from $77
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to Los Angeles departing on 8/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Frontier flights from Washington, D.C. Dulles Intl Airport to Ontario
Our best Frontier deals on Washington, D.C. Dulles Intl Airport to Ontario flight tickets
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How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport to Ontario
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Ontario?
In general, June is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $358. If you aren’t able to travel during the month of June, then book flights to Ontario from Washington, D.C. Dulles Intl Airport during August instead. Flights to Ontario in August, while not as cheap as those in June, still average around $358.
What is the cheapest day to depart on your flight to Ontario?
The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $323. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Washington, D.C. Dulles Intl Airport to Ontario for around $480.
What is the cheapest time of day to depart on your flight to Ontario?
In the afternoon is the cheapest time of day to fly from Washington, D.C. Dulles Intl Airport to Ontario when you can find flight prices for as low as $366. Flying to Ontario in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $431 on average. Flights to Ontario from Washington, D.C. Dulles Intl Airport in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.
How far in advance should I book a flight to Ontario?
You are more likely to see cheaper flights to Ontario from Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $461 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Washington, D.C. Dulles Intl Airport for as low as $335 on momondo.
What is the cheapest airline that flies from Washington, D.C. Dulles Intl to Ontario?
Frontier, Hawaiian Airlines, and Alaska Airlines are the most popular carriers operating from Washington, D.C. Dulles Intl to Ontario
What airlines fly to Ontario?
United Airlines, Alaska Airlines and Frontier are the top three most popular airlines that fly to Ontario from Washington, D.C. Dulles Intl Airport according to our data. United Airlines is the first choice among our users, with 74% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 8 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.
When to book flights from Washington, D.C. Dulles Intl Airport to Ontario
Cheap Washington, D.C. Dulles Intl Airport to Ontario (IAD to ONT) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Dulles Intl Airport to Ontario
How far is Washington, D.C. Dulles Intl to Ontario by plane?
There are 2238.2 mi between Washington, D.C. Dulles Intl and Ontario. In terms of flight time, this usually takes a little over 7h 23m.
When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to Ontario Airport?
Prices for flights from Washington, D.C. Dulles Intl Airport to Ontario Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Washington, D.C. Dulles Intl Airport to Ontario Airport?
As of July 2025, there are 5 operators available to choose from for flights from Washington, D.C. Dulles Intl Airport to Ontario Airport.
How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to Ontario Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents required for your trip to Ontario Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Washington, D.C. Dulles Intl Airport to Ontario?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Washington, D.C. Dulles Intl Airport to Ontario is Delta (25% of total bookings). The next most popular airlines are United Airlines (24%), Southwest (24%), and American Airlines (19%).
Best airlines flying from Washington, D.C. Dulles Intl Airport to Ontario
Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to Ontario with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $198 | Free Cancellation | Rating 5.9 3,284 reviews | |||
| PriceFrom $286 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $286 | Free Cancellation | Rating 8.0 7,983 reviews | |||
| PriceFrom $320 | Free Cancellation | Rating 7.4 8,861 reviews | |||
| PriceFrom $326 | Free Cancellation | Rating 8.0 4,270 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from Washington, D.C. to Ontario?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Washington, D.C. to Ontario. momondo saves you time and could save you money on your trip.
Can I find flights from Washington, D.C. to Ontario with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for Washington, D.C. to Ontario flights to just show those with flexible booking policies.
How can momondo help me find flights from Washington, D.C. to Ontario?
momondo provides multiple filters to help you find the best flight to Ontario from Washington, D.C.. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from Washington, D.C. to Ontario right now. Can momondo alert me if prices change?
Yes. momondo can track prices for Washington, D.C. to Ontario flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.