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$816+ Cheap flights from Sofia (SOF) to Ontario (ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/28. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ONT
Feb 5 — Feb 121
Thu 2/5
Thu 2/12
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 6, 2026.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$828
(British Airways)

One-way from

$816
(Priceline)

Popular in

May

Cheapest in

February

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. 3% potential increase in price ($31 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($11 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 6, 2026.

This British Airways deal was found by Cheapflights users on 1/4. 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.
Wed 4/19:25 pmSOF - ONT
2 stops28h 57mBritish Airways
Tue 4/1410:59 amONT - SOF
2 stops23h 41mBritish Airways
Deal found 1/4$828
This British Airways deal was found by Cheapflights users on 1/5. 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.
Sun 2/152:30 pmSOF - ONT
2 stops35h 49mBritish Airways
Tue 4/142:08 pmONT - SOF
2 stops20h 32mBritish Airways
Deal found 1/5$857
This KLM deal was found by Cheapflights users on 1/4. 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.
Thu 4/27:00 amSOF - ONT
2 stops20h 13mKLM
Tue 4/147:30 amONT - SOF
2 stops20h 30mKLM
Deal found 1/4$927
This United Airlines deal was found by Cheapflights users on 1/5. 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 2/146:25 amSOF - ONT
2 stops25h 34mUnited Airlines
Tue 4/141:34 pmONT - SOF
2 stops18h 26mUnited Airlines
Deal found 1/5$932
This United Airlines deal was found by Cheapflights users on 1/6. 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 1/226:00 amSOF - ONT
2 stops25h 58mUnited Airlines
Sat 1/315:05 amONT - SOF
2 stops31h 40mUnited Airlines
Deal found 1/6$940
This United Airlines deal was found by Cheapflights users on 1/6. 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 1/6$941
This Priceline deal was found by Cheapflights users on 1/5. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/119:10 pmSOF - ONT
2 stops30h 27mBritish Airways
Sat 10/1712:48 pmONT - SOF
2 stops21h 32mBritish Airways
Deal found 1/5$966
This KLM deal was found by Cheapflights users on 1/4. 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.
Sat 4/47:00 amSOF - ONT
2 stops20h 13mKLM
Tue 4/147:30 amONT - SOF
2 stops20h 30mKLM
Deal found 1/4$1,049
This United Airlines deal was found by Cheapflights users on 1/4. 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 4/58:00 amSOF - ONT
2 stops24h 26mUnited Airlines
Sat 4/117:00 amONT - SOF
2 stops18h 40mUnited Airlines
Deal found 1/4$1,074
This United Airlines deal was found by Cheapflights users on 1/3. 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 2/146:25 amSOF - ONT
2 stops25h 34mUnited Airlines
Fri 5/151:28 pmONT - SOF
2 stops23h 02mUnited Airlines
Deal found 1/3$1,132
This British Airways deal was found by Cheapflights users on 1/3. 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 2/1412:05 pmSOF - ONT
2 stops20h 44mBritish Airways
Fri 5/1511:59 pmONT - SOF
2 stops34h 21mBritish Airways
Deal found 1/3$1,470
This oojo deal was found by Cheapflights users on 1/5. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/49:05 pmSOF - ONT
2 stops34h 24mTurkish Airlines
Fri 10/910:56 pmONT - SOF
2 stops30h 04mTurkish Airlines
Deal found 1/5$1,803

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 6, 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 4/1

9:25 pm-4:22 pm

2 stops28h 57m

Ontario

Tue 4/14

10:59 am-8:40 pm

2 stops23h 41m

$828

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sun 4/5

9:05 pm-10:07 pm

2 stops35h 02m

Ontario

Tue 4/14

10:59 am-8:40 pm

2 stops23h 41m

$828

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sun 4/5

9:05 pm-10:07 pm

2 stops35h 02m

Ontario

Mon 4/13

11:59 pm-8:40 pm

2 stops34h 41m

$828

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 4/1

9:25 pm-4:22 pm

2 stops28h 57m

Ontario

Mon 4/13

11:59 pm-8:40 pm

2 stops34h 41m

$828

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sun 2/15

2:30 pm-4:19 pm

2 stops35h 49m

Ontario

Tue 4/14

2:08 pm-8:40 pm

2 stops20h 32m

$857

SofiaOntario

SOF - ONT

SOFONT

Sofia

Mon 2/16

5:25 pm-4:22 pm

2 stops32h 57m

Ontario

Tue 4/14

2:08 pm-8:40 pm

2 stops20h 32m

$857

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 4/3

7:00 am-5:13 pm

2 stops20h 13m

Ontario

Tue 4/14

7:30 am-2:00 pm

2 stops20h 30m

$927

SofiaOntario

SOF - ONT

SOFONT

Sofia

Tue 2/17

6:00 am-5:41 pm

2 stops21h 41m

Ontario

Tue 4/14

7:00 am-1:05 pm

2 stops20h 05m

$932

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 2/14

6:25 am-9:59 pm

2 stops25h 34m

Ontario

Tue 4/14

1:34 pm-6:00 pm

2 stops18h 26m

$932

SofiaOntario

SOF - ONT

SOFONT

Sofia

Thu 4/2

6:30 am-8:36 pm

2 stops24h 06m

Ontario

Wed 4/15

1:34 pm-6:05 pm

2 stops18h 31m

$932

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/6

Showing 1-10 of 14 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 $828, British Airways can have you in Ontario from Sofia in 28h 57m. 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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