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$483+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
SOF — ONT
Mar 3 — Mar 101
Tue 3/3
Tue 3/10
1 adult, Economy
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Cheap 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 February 1, 2026.

This United Airlines deal was found by Cheapflights users on 1/30. 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 2/256:10 am
SOF
-
ONT
2 stops24h 40m
United Airlines
Thu 3/126:37 pm
ONT
-
SOF
2 stops19h 08m
United Airlines
Deal found 1/30$958
This Qatar Airways deal was found by Cheapflights users on 1/30. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/1912:30 pm
SOF
-
ONT
2 stops45h 02m
Qatar Airways
Tue 3/176:14 am
ONT
-
SOF
2 stops44h 11m
Qatar Airways
Deal found 1/30$1,972
This Gurufare deal was found by Cheapflights users on 1/30. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/62:35 pm
SOF
-
ONT
2 stops40h 01m
Multiple Airlines
Thu 2/1912:02 pm
ONT
-
SOF
2 stops19h 43m
Multiple Airlines
Deal found 1/30$2,025
This Qatar Airways deal was found by Cheapflights users on 1/30. 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 Qatar Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/612:30 pm
SOF
-
ONT
2 stops35h 48m
Qatar Airways
Thu 2/1912:02 pm
ONT
-
SOF
2 stops37h 23m
Qatar Airways
Deal found 1/30$2,660
This United Airlines deal was found by Cheapflights users on 1/30. 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 2/182:00 pm
SOF
-
ONT
2 stops18h 57m
United Airlines
Mon 3/166:37 pm
ONT
-
SOF
2 stops19h 08m
United Airlines
Deal found 1/30$3,442
This United Airlines deal was found by Cheapflights users on 1/30. 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.
Sun 3/12:25 pm
SOF
-
ONT
2 stops18h 32m
United Airlines
Sun 3/156:37 pm
ONT
-
SOF
2 stops19h 08m
United Airlines
Deal found 1/30$4,527
This British Airways deal was found by Cheapflights users on 1/30. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/99:05 pm
SOF
-
ONT
2 stops29h 19m
British Airways
Fri 12/1811:59 pm
ONT
-
SOF
2 stops27h 01m
British Airways
Deal found 1/30$6,203

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 February 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$958
(United Airlines)

One-way from

$483
(Kiwi.com)

Popular in

May

Cheapest in

October

Average price

$829
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
One-way flight from Sofia to Ontario
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($20 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 1, 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

Sun 3/1

2:25 pm-10:57 pm

2 stops18h 32m

Ontario

Thu 3/12

6:37 pm-10:45 pm

2 stops19h 08m

$958

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 2/27

6:10 am-8:07 pm

2 stops23h 57m

Ontario

Thu 3/12

6:37 pm-10:45 pm

2 stops19h 08m

$958

SofiaOntario

SOF - ONT

SOFONT

Sofia

Thu 2/19

12:30 pm-11:32 pm

2 stops45h 02m

Ontario

Tue 3/17

6:14 am-11:25 am

2 stops44h 11m

$1,972

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 2/18

2:00 pm-10:57 pm

2 stops18h 57m

Ontario

Mon 3/16

6:37 pm-10:45 pm

2 stops19h 08m

$3,442

SofiaOntario

SOF - ONT

SOFONT

Sofia

Sun 3/1

2:25 pm-10:57 pm

2 stops18h 32m

Ontario

Sun 3/15

6:37 pm-10:45 pm

2 stops19h 08m

$4,527

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 5/6

9:05 pm-8:04 pm

3 stops56h 59m

$483

SofiaOntario

SOF - ONT

SOFONT

Sofia

Wed 5/6

9:25 pm-10:35 pm

2 stops35h 10m

$602

SofiaOntario

SOF - ONT

SOFONT

Sofia

Fri 5/8

8:00 am-10:30 pm

2 stops24h 30m

$949

SofiaOntario

SOF - ONT

SOFONT

Sofia

Tue 2/10

2:00 pm-5:43 pm

2 stops37h 43m

$957

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/31

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 $958, United Airlines can have you in Ontario from Sofia in 18h 32m. There are 6585 mi between Sofia and Ontario. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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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