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$896+ 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 12/24. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ONT
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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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 October 30, 2025.

This United Airlines deal was found by Cheapflights users on 10/30. 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 12/246:10 amSOF - ONT
2 stops26h 15mUnited Airlines
Thu 3/267:15 pmONT - SOF
2 stops18h 30mUnited Airlines
Deal found 10/30$896
This United Airlines deal was found by Cheapflights users on 10/30. 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 12/56:10 amSOF - ONT
2 stops21h 27mUnited Airlines
Wed 2/251:45 pmONT - SOF
2 stops18h 35mUnited Airlines
Deal found 10/30$899
This United Airlines deal was found by Cheapflights users on 10/29. 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 12/246:10 amSOF - ONT
2 stops26h 15mUnited Airlines
Tue 3/247:15 pmONT - SOF
2 stops18h 30mUnited Airlines
Deal found 10/29$901
This United Airlines deal was found by Cheapflights users on 10/29. 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 12/277:55 amSOF - ONT
2 stops24h 30mUnited Airlines
Thu 3/267:15 pmONT - SOF
2 stops18h 30mUnited Airlines
Deal found 10/29$942
This United Airlines deal was found by Cheapflights users on 10/29. 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 11/147:55 amSOF - ONT
3 stops24h 56mUnited Airlines
Tue 11/185:05 amONT - SOF
2 stops27h 15mUnited Airlines
Deal found 10/29$1,273
This United Airlines deal was found by Cheapflights users on 10/29. 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 12/277:55 amSOF - ONT
2 stops24h 30mUnited Airlines
Fri 3/277:15 pmONT - SOF
2 stops18h 30mUnited Airlines
Deal found 10/29$1,358
This United Airlines deal was found by Cheapflights users on 10/29. 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 11/77:55 amSOF - ONT
2 stops24h 36mUnited Airlines
Thu 12/185:05 amONT - SOF
2 stops22h 45mUnited Airlines
Deal found 10/29$1,648
This United Airlines deal was found by Cheapflights users on 10/29. 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 11/66:05 amSOF - ONT
2 stops26h 46mUnited Airlines
Thu 12/185:05 amONT - SOF
2 stops22h 45mUnited Airlines
Deal found 10/29$1,649

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 October 30, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$901
(United Airlines)

Popular in

May

Cheapest in

February

Average price

$893
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 ($33 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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 October 30, 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

Wed 12/24

6:10 am-10:25 pm

2 stops26h 15m

Ontario

Thu 3/26

7:15 pm-10:45 pm

2 stops18h 30m

$896

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 12/24

6:10 am-10:25 pm

2 stops26h 15m

Ontario

Wed 3/25

7:15 pm-10:45 pm

2 stops18h 30m

$896

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 12/24

6:10 am-10:25 pm

2 stops26h 15m

Ontario

Tue 3/24

7:15 pm-10:45 pm

2 stops18h 30m

$896

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 12/24

6:10 am-10:25 pm

2 stops26h 15m

Ontario

Mon 3/30

4:15 pm-11:10 pm

2 stops20h 55m

$896

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 12/5

6:10 am-5:37 pm

2 stops21h 27m

Ontario

Wed 2/25

1:45 pm-6:20 pm

2 stops18h 35m

$899

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 12/27

7:55 am-10:25 pm

2 stops24h 30m

Ontario

Wed 3/25

7:15 pm-10:45 pm

2 stops18h 30m

$942

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 12/27

7:55 am-10:25 pm

2 stops24h 30m

Ontario

Tue 3/24

1:45 pm-6:20 pm

2 stops19h 35m

$942

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sat 12/27

7:55 am-10:25 pm

2 stops24h 30m

Ontario

Thu 3/26

7:15 pm-10:45 pm

2 stops18h 30m

$942

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 11/14

7:55 am-10:51 pm

3 stops24h 56m

Ontario

Tue 11/18

5:05 am-6:20 pm

2 stops27h 15m

$1,273

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

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 $568). Flying from Sofia to Ontario in April is currently the most expensive (average of $829). 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 $896, United Airlines can have you in Ontario from Sofia in 26h 15m. 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 $568). Flying from Sofia to Ontario in April is currently the most expensive (average of $829). 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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