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$887+ 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 10/31. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ONT
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
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 September 17, 2025.

Round-trip from

$887
(United Airlines)

Popular in

May

Cheapest in

February

Average price

$839
From Sofia to Ontario
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Highest demand for flights based on searches. 4% potential increase in price ($36 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 17, 2025.

This United Airlines deal was found by Cheapflights users on 9/16. 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.
Fri 10/316:10 amSOF - ONT
2 stops49h 21mUnited Airlines
Fri 11/76:00 amONT - SOF
2 stops26h 20mUnited Airlines
Deal found 9/16$887
This Air France deal was found by Cheapflights users on 9/14. 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 Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/147:00 amSOF - ONT
2 stops25h 41mAir France
Tue 11/1811:45 amONT - SOF
2 stops40h 20mAir France
Deal found 9/14$991
This British Airways deal was found by Cheapflights users on 9/17. 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.
Mon 11/35:25 pmSOF - ONT
2 stops34h 56mBritish Airways
Tue 11/183:08 pmONT - SOF
2 stops19h 02mBritish Airways
Deal found 9/17$1,118
This United Airlines deal was found by Cheapflights users on 9/14. 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 11/146:10 amSOF - ONT
3 stops26h 41mUnited Airlines
Tue 11/185:05 amONT - SOF
2 stops27h 15mUnited Airlines
Deal found 9/14$1,270
This United Airlines deal was found by Cheapflights users on 9/14. 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 12/206:05 amSOF - ONT
2 stops21h 38mUnited Airlines
Fri 1/210:42 amONT - SOF
2 stops21h 38mUnited Airlines
Deal found 9/14$1,562
This Qatar Airways deal was found by Cheapflights users on 9/15. 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.
Mon 11/312:30 pmSOF - ONT
2 stops35h 32mQatar Airways
Tue 11/183:08 pmONT - SOF
2 stops34h 17mQatar Airways
Deal found 9/15$2,131

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 September 17, 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 10/31

6:10 am-10:31 pm

2 stops49h 21m

Ontario

Fri 11/7

6:00 am-6:20 pm

2 stops26h 20m

$887

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 11/14

7:00 am-10:41 pm

2 stops25h 41m

Ontario

Tue 11/18

11:45 am-2:05 pm

2 stops40h 20m

$991

SofiaOntario

SOF - ONT

SOFONT

Sofia

Mon 11/3

5:25 pm-6:21 pm

2 stops34h 56m

Ontario

Tue 11/18

3:08 pm-8:10 pm

2 stops19h 02m

$1,118

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 11/14

6:10 am-10:51 pm

3 stops26h 41m

Ontario

Tue 11/18

5:05 am-6:20 pm

2 stops27h 15m

$1,270

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 12/20

6:05 am-5:43 pm

2 stops21h 38m

Ontario

Fri 1/2

10:42 am-6:20 pm

2 stops21h 38m

$1,562

SofiaOntario

SOF - ONT

SOFONT

Sofia

Thu 10/16

7:00 am-3:53 pm

2 stops18h 53m

$907

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 10/11

6:00 am-9:24 pm

2 stops25h 24m

$911

SofiaOntario

SOF - ONT

SOFONT

Sofia

Tue 9/30

6:00 am-10:52 pm

2 stops26h 52m

$912

SofiaOntario

SOF - ONT

SOFONT

Sofia

Mon 9/29

1:30 pm-6:47 pm

2 stops39h 17m

$916

SofiaOntario

SOF - ONT

SOFONT

Sofia

Thu 10/2

1:30 pm-12:03 am

2 stops44h 33m

$916

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 15 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, August is the cheapest month in which you can book a flight from Sofia to Ontario (average of $246). Flying from Sofia to Ontario in March is currently the most expensive (average of $327). 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 $991, United Airlines can have you in Ontario from Sofia in 25h 41m. There are 6585 mi between Sofia and Ontario. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Sofia to Ontario one-way?

    One-way options have recently been found by users for as low as $907 on KLM. Other airlines that offer cheap prices include United Airlines from $911 and Qatar Airways from $916 one-way.

  • 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, August is the cheapest month in which you can book a flight from Sofia to Ontario (average of $246). Flying from Sofia to Ontario in March is currently the most expensive (average of $327). 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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