$565 Cheap Flights from Sofia (SOF) to Ontario (ONT)

View $565 flight on Wed, Nov 5, 2025Opens in a new window

Popular airlines from Sofia Airport (SOF) to Los Angeles - Ontario Intl. Airport (ONT)

    notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
    deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
    trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Sofia to Ontario (SOF-ONT)

Prices were available within the past 7 days and start at $565 for one-way flights and $815 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Wed, Nov 19 - Tue, Dec 2
SOF
Sofia
ONT
Ontario
$815 Roundtrip, found 7 hours ago
$815
Roundtrip
found 7 hours ago
Select British Airways flight, departing Wed, Nov 19 from Sofia to Ontario, returning Tue, Dec 2, priced at $815 found 7 hours ago
British Airways
Wed, Dec 10 - Tue, Dec 23
SOF
Sofia
ONT
Ontario
$845 Roundtrip, found 4 hours ago
$845
Roundtrip
found 4 hours ago
Select British Airways flight, departing Wed, Dec 10 from Sofia to Ontario, returning Tue, Dec 23, priced at $845 found 4 hours ago
British Airways
Mon, Oct 27 - Sat, Apr 18
SOF
Sofia
ONT
Ontario
$896 Roundtrip, found 22 hours ago
$896
Roundtrip
found 22 hours ago
Select British Airways flight, departing Mon, Oct 27 from Sofia to Ontario, returning Sat, Apr 18, priced at $896 found 22 hours ago
British Airways
Sat, Nov 1 - Sat, Nov 15
SOF
Sofia
ONT
Ontario
$906 Roundtrip, found 3 days ago
$906
Roundtrip
found 3 days ago
Select British Airways flight, departing Sat, Nov 1 from Sofia to Ontario, returning Sat, Nov 15, priced at $906 found 3 days ago
United
Sat, Nov 22 - Sat, Dec 6
SOF
Sofia
ONT
Ontario
$917 Roundtrip, found 1 day ago
$917
Roundtrip
found 1 day ago
Select United flight, departing Sat, Nov 22 from Sofia to Ontario, returning Sat, Dec 6, priced at $917 found 1 day ago
United
Sat, Nov 22 - Sat, Dec 6
SOF
Sofia
ONT
Ontario
$930 Roundtrip, found 1 day ago
$930
Roundtrip
found 1 day ago
Select United flight, departing Sat, Nov 22 from Sofia to Ontario, returning Sat, Dec 6, priced at $930 found 1 day ago
British Airways
Wed, Dec 10 - Fri, Jan 2
SOF
Sofia
ONT
Ontario
$947 Roundtrip, found 2 hours ago
$947
Roundtrip
found 2 hours ago
Select British Airways flight, departing Wed, Dec 10 from Sofia to Ontario, returning Fri, Jan 2, priced at $947 found 2 hours ago
Lufthansa
Fri, Nov 21 - Mon, Dec 1
SOF
Sofia
ONT
Ontario
$977 Roundtrip, found 6 days ago
$977
Roundtrip
found 6 days ago
Select Lufthansa flight, departing Fri, Nov 21 from Sofia to Ontario, returning Mon, Dec 1, priced at $977 found 6 days ago
American Airlines
Wed, Dec 10 - Fri, Jan 2
SOF
Sofia
ONT
Ontario
$1,093 Roundtrip, found 2 hours ago
$1,093
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Wed, Dec 10 from Sofia to Ontario, returning Fri, Jan 2, priced at $1,093 found 2 hours ago
KLM
Tue, Dec 9 - Mon, Dec 22
SOF
Sofia
ONT
Ontario
$1,110 Roundtrip, found 7 hours ago
$1,110
Roundtrip
found 7 hours ago
Select KLM flight, departing Tue, Dec 9 from Sofia to Ontario, returning Mon, Dec 22, priced at $1,110 found 7 hours ago
Flights from Sofia (SOF) to Ontario (ONT)
Origin airport
Sofia
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Air France, British Airways, KLM, United
Roundtrip price
$814
Distance
6588 mi

Sofia to Ontario Flights

The cheapest times to fly from Sofia to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Sofia to Ontario are during the month of November. You can find some of the cheapest flights from Sofia to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Sofia to Ontario

Sunday is one of the best days to book for cheap flights from Sofia to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Sofia to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Sofia to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $565 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Sofia to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Sofia to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Sofia Airport (SOF) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Grab a cheap one-way flight from $565 or cheap return flight from $815 from Sofia Airport (SOF) to Los Angeles - Ontario Intl. Airport (ONT) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Sofia Airport (SOF) to Los Angeles - Ontario Intl. Airport (ONT)?
The cheapest month to fly from SOF to ONT is November, when there's less demand. Off-peak months are generally when you'll find lower airfares between these airports.
What is the cheapest airline that flies from Sofia Airport (SOF) to Los Angeles - Ontario Intl. Airport (ONT)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find the carrier with the cheapest SOF to ONT flight.
How many flights per day from Sofia Airport (SOF) to Los Angeles - Ontario Intl. Airport (ONT)?
Nonstop flights from Sofia Airport (SOF) to Los Angeles - Ontario Intl. Airport (ONT) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SOF to ONT?
Generally you'll find the widest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* However, this can change depending on the airline, season and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Sofia Airport (SOF) to Los Angeles - Ontario Intl. Airport (ONT)?
To reach Los Angeles - Ontario Intl. Airport (ONT) on time, opt for a flight that leaves Sofia Airport (SOF) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Sofia Airport (SOF) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Holding off until right before your break to book a ticket from SOF to ONT often results in higher prices. While it's possible to find some last-minute deals, they're not always guaranteed. Be flexible with your itinerary to maximize your chances of snagging a bargain.
Is it cheaper to book a SOF to ONT flight and hotel package?
Securing a SOF to ONT flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Select from our extensive range of accommodations and then add activities, car rentals and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Sofia Airport (SOF) to Los Angeles - Ontario Intl. Airport (ONT)?
If you booked your SOF to ONT flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the ticket type you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal if you'd like more information.

Explore a world of travel with Expedia

*Available to One Key members.