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$813+ 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 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ONT
Aug 26 — Sep 21
Tue 8/26
Tue 9/2
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 August 21, 2025.

Round-trip from

$823
(United Airlines)

One-way from

$813
(American Airlines)

Popular in

May

Cheapest in

February

Average price

$903
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. 4% potential increase in price ($35 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 August 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 August 21, 2025.

This United Airlines deal was found by Cheapflights users on 8/20. 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 12/156:10 amSOF - ONT
2 stops21h 27mUnited Airlines
Thu 1/86:42 pmONT - SOF
2 stops18h 03mUnited Airlines
Deal found 8/20$823
This United Airlines deal was found by Cheapflights users on 8/20. 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 11/142:35 pmSOF - ONT
2 stops18h 16mUnited Airlines
Tue 11/181:33 pmONT - SOF
2 stops23h 12mUnited Airlines
Deal found 8/20$833
This United Airlines deal was found by Cheapflights users on 8/20. 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 12/136:25 amSOF - ONT
2 stops21h 12mUnited Airlines
Thu 1/86:42 pmONT - SOF
2 stops18h 03mUnited Airlines
Deal found 8/20$834
This Qatar Airways deal was found by Cheapflights users on 8/21. 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 10/21:30 pmSOF - ONT
2 stops34h 24mQatar Airways
Thu 4/23:09 pmONT - SOF
2 stops35h 21mQatar Airways
Deal found 8/21$1,749
This Qatar Airways deal was found by Cheapflights users on 8/20. 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 9/181:30 pmSOF - ONT
2 stops34h 24mQatar Airways
Wed 10/12:54 pmONT - SOF
2 stops35h 36mQatar Airways
Deal found 8/20$1,753

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 August 21, 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

Mon 12/15

6:10 am-5:37 pm

2 stops21h 27m

Ontario

Thu 1/8

6:42 pm-10:45 pm

2 stops18h 03m

$823

SofiaOntario

SOF - ONT

SOFONT

Sofia

Thu 2/12

6:00 am-8:45 pm

2 stops24h 45m

Ontario

Fri 2/20

1:00 pm-6:20 pm

2 stops19h 20m

$823

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 11/14

2:35 pm-10:51 pm

2 stops18h 16m

Ontario

Tue 11/18

1:33 pm-10:45 pm

2 stops23h 12m

$833

SofiaOntario

SOF - ONT

SOFONT

Sofia

Mon 12/15

6:10 am-5:37 pm

2 stops21h 27m

Ontario

Sat 1/10

6:42 pm-10:45 pm

2 stops18h 03m

$834

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 12/13

6:25 am-5:37 pm

2 stops21h 12m

Ontario

Wed 1/7

6:42 pm-10:45 pm

2 stops18h 03m

$834

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 12/13

6:25 am-5:37 pm

2 stops21h 12m

Ontario

Thu 1/8

6:42 pm-10:45 pm

2 stops18h 03m

$834

SofiaOntario

SOF - ONT

SOFONT

Sofia

Mon 12/15

6:10 am-5:37 pm

2 stops21h 27m

Ontario

Wed 1/7

6:42 pm-10:45 pm

2 stops18h 03m

$834

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 12/13

6:25 am-5:37 pm

2 stops21h 12m

Ontario

Sat 1/10

6:42 pm-10:45 pm

2 stops18h 03m

$834

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 10/17

2:20 pm-8:07 pm

2 stops39h 47m

$813

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sun 10/19

9:10 pm-8:07 pm

2 stops32h 57m

$813

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/21

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 $328). 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 $823, United Airlines can have you in Ontario from Sofia in 21h 27m. There are 6585 mi between Sofia and Ontario.

  • 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 $813 on American Airlines. Other airlines that offer cheap prices include Qatar Airways from $900 and KLM from $902 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 $328). 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.

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