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$856+ 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 1/24. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ONT
Feb 16 — Feb 231
Mon 2/16
Mon 2/23
1 adult, Economy
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Cheap 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 January 17, 2026.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$925
(United Airlines)

One-way from

$912
(KAYAK)

Popular in

May

Cheapest in

October

Average price

$939
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
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One-way flight from Sofia to Ontario
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Highest demand for flights based on searches. 2% potential increase in price ($25 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find 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 January 17, 2026.

This British Airways deal was found by Cheapflights users on 1/16. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/2412:05 pm
SOF
-
ONT
2 stops36h 13m
British Airways
Thu 2/192:39 pm
ONT
-
SOF
2 stops34h 36m
British Airways
Deal found 1/16$856
This British Airways deal was found by Cheapflights users on 1/16. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/2412:05 pm
SOF
-
ONT
2 stops36h 13m
British Airways
Tue 2/172:39 pm
ONT
-
SOF
2 stops19h 31m
British Airways
Deal found 1/16$885
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/286:10 am
SOF
-
ONT
2 stops21h 33m
United Airlines
Wed 2/186:37 pm
ONT
-
SOF
2 stops18h 08m
United Airlines
Deal found 1/16$925
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/32:00 pm
SOF
-
ONT
2 stops18h 53m
United Airlines
Wed 2/186:37 pm
ONT
-
SOF
2 stops18h 08m
United Airlines
Deal found 1/16$936
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/296:05 am
SOF
-
ONT
2 stops26h 48m
United Airlines
Fri 2/206:37 pm
ONT
-
SOF
2 stops18h 08m
United Airlines
Deal found 1/16$937
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/246:25 am
SOF
-
ONT
2 stops21h 26m
United Airlines
Mon 2/166:37 pm
ONT
-
SOF
2 stops18h 08m
United Airlines
Deal found 1/16$954
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/252:00 pm
SOF
-
ONT
2 stops18h 53m
United Airlines
Mon 2/166:37 pm
ONT
-
SOF
2 stops18h 08m
United Airlines
Deal found 1/16$966
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/216:10 am
SOF
-
ONT
2 stops24h 48m
United Airlines
Thu 2/126:10 am
ONT
-
SOF
2 stops21h 40m
United Airlines
Deal found 1/16$983
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/202:00 pm
SOF
-
ONT
2 stops37h 43m
United Airlines
Tue 2/171:50 pm
ONT
-
SOF
2 stops46h 55m
United Airlines
Deal found 1/16$994
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/226:05 am
SOF
-
ONT
2 stops21h 38m
United Airlines
Wed 2/186:37 pm
ONT
-
SOF
2 stops18h 08m
United Airlines
Deal found 1/16$996
This United Airlines deal was found by Cheapflights users on 1/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/226:05 am
SOF
-
ONT
2 stops21h 38m
United Airlines
Thu 2/191:45 pm
ONT
-
SOF
2 stops18h 15m
United Airlines
Deal found 1/16$997
This Gurufare deal was found by Cheapflights users on 1/16. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/42:00 pm
SOF
-
ONT
2 stops18h 53m
Lufthansa
Thu 2/261:45 pm
ONT
-
SOF
2 stops18h 15m
Lufthansa
Deal found 1/16$1,058

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 January 17, 2026.
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

Wed 1/28

6:10 am-5:43 pm

2 stops21h 33m

Ontario

Wed 2/18

6:37 pm-10:45 pm

2 stops18h 08m

$925

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 1/31

6:25 am-10:53 pm

2 stops26h 28m

Ontario

Wed 2/18

6:37 pm-10:45 pm

2 stops18h 08m

$925

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 2/6

6:10 am-9:58 pm

2 stops25h 48m

Ontario

Tue 2/24

8:00 am-1:45 pm

2 stops19h 45m

$925

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 1/30

6:10 am-10:53 pm

2 stops26h 43m

Ontario

Thu 2/19

6:37 pm-10:45 pm

2 stops18h 08m

$925

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 1/30

6:10 am-10:53 pm

2 stops26h 43m

Ontario

Mon 2/16

6:37 pm-10:45 pm

2 stops18h 08m

$925

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 1/28

6:10 am-10:53 pm

2 stops26h 43m

Ontario

Fri 2/20

6:37 pm-10:45 pm

2 stops18h 08m

$925

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 1/31

6:25 am-5:51 pm

2 stops21h 26m

Ontario

Mon 2/16

6:37 pm-10:45 pm

2 stops18h 08m

$925

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 2/4

2:00 pm-10:53 pm

2 stops18h 53m

Ontario

Mon 2/23

1:50 pm-10:45 pm

2 stops22h 55m

$936

SofiaOntario

SOF - ONT

SOFONT

Sofia

Tue 2/3

2:00 pm-10:53 pm

2 stops18h 53m

Ontario

Thu 2/19

6:37 pm-10:45 pm

2 stops18h 08m

$936

SofiaOntario

SOF - ONT

SOFONT

Sofia

Tue 2/3

2:00 pm-10:53 pm

2 stops18h 53m

Ontario

Mon 2/23

1:50 pm-10:45 pm

2 stops22h 55m

$936

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/15

Showing 1-10 of 24 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 $822). 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 $925, United Airlines can have you in Ontario from Sofia in 21h 33m. 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 $822). 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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