Cheap flights from the United States to Los Angeles from $39
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United States to Los Angeles departing on 10/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from the United States to Los Angeles
Recent round-trip flight deals from the United States to Los Angeles
Recent one-way flight deals from the United States to Los Angeles
Recent last minute flight deals from the United States to Los Angeles
Recent direct flight deals from the United States to Los Angeles
United Airlines flights from United States to Ontario
Our best United Airlines deals on United States to Ontario flight tickets
American Airlines flights from United States to Ontario
Our best American Airlines deals on United States to Ontario flight tickets
See travel insights to Los Angeles from
How to get the cheapest flight ticket from United States 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, September is the cheapest month to fly from United States to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $289. If you aren’t able to travel during the month of September, then book flights to Ontario from United States during April instead. Flights to Ontario in April, while not as cheap as those in September, still average around $307.
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 Wednesday when prices can be found for as low as $331. This is often the case because there is less demand to fly during this day of the week. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from United States to Ontario for around $380.
What is the cheapest time of day to depart on your flight to Ontario?
At noon is the cheapest time of day to fly from United States to Ontario when you can find flight prices for as low as $334. Flying to Ontario at noon 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 morning when prices are $362 on average. Flights to Ontario from United States in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.
What is the cheapest United States to Ontario flight route?
Fly from San Francisco to Ontario for the best United States - Ontario flight prices
How far in advance should I book a flight to Ontario?
You are more likely to see cheaper flights to Ontario from United States when booking 5 weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $367 when searching 5 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from United States for as low as $249 on momondo.
What cabin class options are available on United States to Ontario flights?
There are 4 cabin classes available to choose from on United States to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from United States to Ontario?
Southwest, American Airlines, and Frontier are the most popular carriers operating from United States to Ontario
What airlines fly to Ontario?
Frontier, Delta and United Airlines are the top three most popular airlines that fly to Ontario from United States according to our data. Frontier is the first choice among our users, with 33% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 13 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.
How many flights depart from United States to Ontario on average per day?
The number of flights available between United States and Ontario is 48 per day as of June 2025. The most frequent departure time is 7:00PM, with 46% of daily flights leaving in the evening.
How many flights depart from United States to Ontario on average per week?
336 flights are operational weekly from United States to Ontario as of June 2025. The most popular departure day for this route is Mon, with 16% of flights per week taking off on this day.
Cheap United States to Ontario flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from United States to Ontario
When did momondo last update prices for flights from United States to Ontario Airport?
Prices for flights from United States to Ontario Airport refresh daily.
How many operators does momondo search for flights from United States to Ontario Airport?
There are 9 operators available for flights from United States to Ontario Airport as of June 2025.
How old do you have to be to fly from United States to Ontario Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from United States 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 plane model from United States to Ontario?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from United States to Ontario is Airbus A320neo (15.48% of total bookings). The next most popular plane models are Airbus A321neo (9.69%), Boeing 737 MAX 8 (9.20%), and Boeing 737-800 Passenger/BBJ2 (winglets) (8.69%).
Best airlines flying from United States to Ontario
Compare and see reviews for airlines that fly from United States to Ontario with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $23 | Free Cancellation | Rating 6.3 8,060 reviews | |||
| PriceFrom $37 | Free Cancellation | Rating 5.9 3,296 reviews | |||
| PriceFrom $58 | Free Cancellation | Rating 7.4 8,801 reviews | |||
| PriceFrom $58 | Free Cancellation | Rating 8.0 7,963 reviews | |||
| PriceFrom $59 | Free Cancellation | Rating 8.0 10,000 reviews | |||
| PriceFrom $97 | Free Cancellation | Rating 8.0 4,278 reviews | |||
| PriceFrom $98 | Free Cancellation | Rating 7.8 2,501 reviews | |||
| PriceFrom $176 | Free Cancellation | Rating 7.3 2,922 reviews | |||
| PriceFrom $230 | Free Cancellation | Rating 7.2 10,000 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from United States to Ontario?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from United States to Ontario. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from United States to Ontario with flexible booking policies on momondo?
All flight searches from United States to Ontario on momondo can be filtered to show those which offer flexible booking policies.
How can momondo help me find flights from United States to Ontario?
Once all potential United States to Ontario flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from United States to Ontario right now. Can momondo alert me if prices change?
Price alerts on flights to Ontario from United States are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.