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$944+ 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 1/19. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ONT
Jan 27 — Feb 31
Tue 1/27
Tue 2/3
1 adult, Economy
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Cheap flight deals from Sofia to Ontario

Best flights from Sofia to Ontario
Discover carefully curated flight deals from Sofia to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 28, 2025.

This United Airlines deal was found by Cheapflights users on 12/27. 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.
Fri 2/62:35 pmSOF - ONT
2 stops18h 18mUnited Airlines
Thu 2/191:45 pmONT - SOF
2 stops18h 15mUnited Airlines
Deal found 12/27$944
This British Airways deal was found by Cheapflights users on 12/26. 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 2/2112:05 pmSOF - ONT
2 stops20h 44mBritish Airways
Wed 2/2511:59 pmONT - SOF
2 stops49h 16mBritish Airways
Deal found 12/26$1,284
This United Airlines deal was found by Cheapflights users on 12/26. 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.
Mon 1/192:20 pmSOF - ONT
2 stops18h 33mUnited Airlines
Thu 2/56:39 pmONT - SOF
2 stops18h 06mUnited Airlines
Deal found 12/26$944
This Qatar Airways deal was found by Cheapflights users on 12/26. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/1512:30 pmSOF - ONT
2 stops45h 26mQatar Airways
Tue 2/311:53 amONT - SOF
2 stops37h 32mQatar Airways
Deal found 12/26$1,945
This United Airlines deal was found by Cheapflights users on 12/26. 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.
Mon 1/192:20 pmSOF - ONT
2 stops18h 33mUnited Airlines
Wed 2/41:53 pmONT - SOF
2 stops22h 52mUnited Airlines
Deal found 12/26$944
This United Airlines deal was found by Cheapflights users on 12/26. 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.
Mon 1/192:20 pmSOF - ONT
2 stops18h 33mUnited Airlines
Tue 2/31:53 pmONT - SOF
2 stops22h 52mUnited Airlines
Deal found 12/26$944
This United Airlines deal was found by Cheapflights users on 12/26. 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.
Mon 1/192:20 pmSOF - ONT
2 stops18h 33mUnited Airlines
Mon 2/21:53 pmONT - SOF
2 stops22h 52mUnited Airlines
Deal found 12/26$944
This United Airlines deal was found by Cheapflights users on 12/26. 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.
Mon 1/192:20 pmSOF - ONT
2 stops18h 33mUnited Airlines
Fri 2/66:39 pmONT - SOF
2 stops18h 06mUnited Airlines
Deal found 12/26$944
This United Airlines deal was found by Cheapflights users on 12/26. 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 2/176:00 amSOF - ONT
2 stops26h 00mUnited Airlines
Tue 2/241:45 pmONT - SOF
2 stops18h 30mUnited Airlines
Deal found 12/26$945
This United Airlines deal was found by Cheapflights users on 12/26. 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 2/196:00 amSOF - ONT
2 stops21h 41mUnited Airlines
Wed 2/258:00 amONT - SOF
2 stops19h 50mUnited Airlines
Deal found 12/26$945
This United Airlines deal was found by Cheapflights users on 12/26. 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 2/186:10 amSOF - ONT
2 stops25h 49mUnited Airlines
Tue 2/241:45 pmONT - SOF
2 stops18h 30mUnited Airlines
Deal found 12/26$945
This United Airlines deal was found by Cheapflights users on 12/26. 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.
Fri 2/206:05 amSOF - ONT
2 stops21h 36mUnited Airlines
Tue 2/241:45 pmONT - SOF
2 stops18h 35mUnited Airlines
Deal found 12/26$1,305

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 28, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$944
(United Airlines)

Popular in

January

Cheapest in

February

Average price

$898
Provider with most accurate pricing for Sofia-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sofia-Los Angeles flights.
Search Deals
From Sofia to Ontario
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($31 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 28, 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 2/6

2:35 pm-10:53 pm

2 stops18h 18m

Ontario

Thu 2/19

1:45 pm-6:00 pm

2 stops18h 15m

$944

SofiaOntario

SOF - ONT

SOFONT

Sofia

Mon 1/19

2:20 pm-10:53 pm

2 stops18h 33m

Ontario

Thu 2/5

6:39 pm-10:45 pm

2 stops18h 06m

$944

SofiaOntario

SOF - ONT

SOFONT

Sofia

Mon 1/19

2:20 pm-10:53 pm

2 stops18h 33m

Ontario

Wed 2/4

1:53 pm-10:45 pm

2 stops22h 52m

$944

SofiaOntario

SOF - ONT

SOFONT

Sofia

Mon 1/19

2:20 pm-10:53 pm

2 stops18h 33m

Ontario

Tue 2/3

1:53 pm-10:45 pm

2 stops22h 52m

$944

SofiaOntario

SOF - ONT

SOFONT

Sofia

Mon 1/19

2:20 pm-10:53 pm

2 stops18h 33m

Ontario

Mon 2/2

1:53 pm-10:45 pm

2 stops22h 52m

$944

SofiaOntario

SOF - ONT

SOFONT

Sofia

Mon 1/19

2:20 pm-10:53 pm

2 stops18h 33m

Ontario

Fri 2/6

6:39 pm-10:45 pm

2 stops18h 06m

$944

SofiaOntario

SOF - ONT

SOFONT

Sofia

Tue 2/17

6:00 am-10:00 pm

2 stops26h 00m

Ontario

Tue 2/24

1:45 pm-6:15 pm

2 stops18h 30m

$945

SofiaOntario

SOF - ONT

SOFONT

Sofia

Thu 2/19

6:00 am-5:41 pm

2 stops21h 41m

Ontario

Wed 2/25

8:00 am-1:50 pm

2 stops19h 50m

$945

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 2/18

6:10 am-9:59 pm

2 stops25h 49m

Ontario

Tue 2/24

1:45 pm-6:15 pm

2 stops18h 30m

$945

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 2/21

12:05 pm-10:49 pm

2 stops20h 44m

Ontario

Wed 2/25

11:59 pm-11:15 am

2 stops49h 16m

$1,284

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/27

Showing 1-10 of 12 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 $944, 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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