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$931+ Cheap flights from Sofia (SOF) to Ontario (ONT)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/30. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ONT
Jan 13 — Jan 201
Tue 1/13
Tue 1/20
1 adult, Economy
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Cheap flight deals from Sofia to Ontario

Cheapest flights from Sofia to Ontario
Explore the most affordable flight options available from Sofia to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 14, 2025.

This KLM deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/307:00 amSOF - ONT
2 stops20h 08mMultiple Airlines
Sat 1/37:05 amONT - SOF
2 stops20h 50mMultiple Airlines
Deal found 12/13$8,003

Find flight deals from Sofia to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Sofia (SOF) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 14, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$931
(United Airlines)

Popular in

January

Cheapest in

February

Average price

$898
Provider with most accurate pricing for Sofia-Los Angeles flight deals.
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Provider most trusted by Cheapflights users for Sofia-Los Angeles flights.
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From Sofia to Ontario
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($28 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in December 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Sofia to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 14, 2025.
Use the filters below to find and compare flights from Sofia to Ontario that are best for you.

Fly from

Sofia

Fly to

Ontario

Route

Depart

Return

Price

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 1/30

2:35 pm-10:53 pm

2 stops18h 18m

Ontario

Thu 2/5

1:53 pm-10:45 pm

2 stops22h 52m

$931

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 1/24

6:25 am-5:51 pm

2 stops21h 26m

Ontario

Fri 2/6

1:24 pm-6:20 pm

2 stops42h 56m

$931

SofiaOntario

SOF - ONT

SOFONT

Sofia

Thu 1/22

6:00 am-5:43 pm

2 stops21h 43m

Ontario

Sun 2/1

1:24 pm-10:45 pm

2 stops47h 21m

$931

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sun 2/8

2:25 pm-10:53 pm

2 stops18h 28m

Ontario

Sun 2/15

6:09 am-6:20 pm

2 stops26h 11m

$931

SofiaOntario

SOF - ONT

SOFONT

Sofia

Thu 1/22

6:00 am-9:58 pm

2 stops25h 58m

Ontario

Wed 2/4

1:53 pm-10:45 pm

2 stops22h 52m

$931

SofiaOntario

SOF - ONT

SOFONT

Sofia

Thu 2/19

6:00 am-10:57 pm

2 stops26h 57m

Ontario

Thu 2/26

1:45 pm-10:45 pm

2 stops23h 00m

$931

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 1/24

6:25 am-11:18 am

2 stops38h 53m

Ontario

Sun 2/1

1:24 pm-10:45 pm

2 stops47h 21m

$931

SofiaOntario

SOF - ONT

SOFONT

Sofia

Thu 2/5

6:00 am-5:43 pm

2 stops21h 43m

Ontario

Wed 3/4

6:37 pm-10:45 pm

2 stops18h 08m

$931

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 1/23

6:10 am-5:43 pm

2 stops21h 33m

Ontario

Sat 1/31

6:32 pm-10:45 pm

2 stops18h 13m

$931

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 1/23

6:10 am-5:43 pm

2 stops21h 33m

Ontario

Fri 2/6

6:00 am-6:20 pm

2 stops26h 20m

$931

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/12

Showing 1-10 of 13 results
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Best time to book a flight from Sofia to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Sofia 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 Sofia to Ontario

What is the cheapest month to book a flight from Sofia to Ontario?

Currently, July is the cheapest month in which you can book a flight from Sofia to Ontario (average of $566). Flying from Sofia to Ontario in August is currently the most expensive (average of $823). 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.

Related info for your journey

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

  • How long is the flight from Sofia to Ontario?

    For as low as $931, United Airlines can have you in Ontario from Sofia in 18h 18m. There are 6585 mi between Sofia and Ontario.

  • Can I find deals for flights from Sofia to Ontario that include hotel bookings?

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

  • How can I find direct flights from Sofia to Ontario?

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

  • Can I find deals for business class flights from Sofia to Ontario?

    Yes. Cheapflights offers flight deals from Sofia 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 Sofia to Ontario?

    Currently, July is the cheapest month in which you can book a flight from Sofia to Ontario (average of $566). Flying from Sofia to Ontario in August is currently the most expensive (average of $823). 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

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