HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sofia

$292+ Cheap flights from Riverside, CA to Sofia (SOF)

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 3/16. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — SOF
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Riverside to Sofia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Riverside to Sofia are usually found in November or October, booked 36 days in advance, depart on a Monday or Tuesday and return on a Wednesday

Cheap flight deals from Riverside to Sofia

Cheapest flights from Riverside to Sofia
Explore the most affordable flight options available from Riverside to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This KLM deal was found by Cheapflights users on 12/17. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/268:35 amLAX - SOF
2 stops19h 30mMultiple Airlines
Thu 1/157:10 amSOF - LAX
1 stop18h 55mMultiple Airlines
Deal found 12/17$716
This KLM deal was found by Cheapflights users on 12/17. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/268:35 amLAX - SOF
2 stops19h 30mKLM
Thu 1/157:00 amSOF - LAX
2 stops19h 05mKLM
Deal found 12/17$720
This oojo deal was found by Cheapflights users on 12/16. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/267:10 pmLAX - SOF
1 stop29h 05mSWISS
Thu 1/154:00 pmSOF - LAX
1 stop34h 35mSWISS
Deal found 12/16$842
This Ovago deal was found by Cheapflights users on 12/16. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/267:00 pmLAX - SOF
2 stops32h 15mLufthansa
Thu 1/156:05 amSOF - LAX
2 stops22h 42mLufthansa
Deal found 12/16$870
This Kiwi.com deal was found by Cheapflights users on 12/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:30 pmLAX - SOF
1 stop33h 45mMultiple Airlines
Wed 1/78:55 pmSOF - LAX
2 stops51h 30mMultiple Airlines
Deal found 12/15$1,222
This Cheapflightsfares deal was found by Cheapflights users on 12/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:30 pmLAX - SOF
2 stops20h 25mAustrian Airlines
Wed 1/77:55 amSOF - LAX
2 stops21h 14mAustrian Airlines
Deal found 12/15$1,235
This American Airlines deal was found by Cheapflights users on 12/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/1511:59 pmLAX - SOF
2 stops34h 11mMultiple Airlines
Mon 12/225:25 pmSOF - LAX
1 stop35h 05mMultiple Airlines
Deal found 12/16$1,308
This United Airlines deal was found by Cheapflights users on 12/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/224:10 pmLAX - SOF
2 stops35h 35mUnited Airlines
Wed 1/76:10 amSOF - LAX
2 stops35h 11mUnited Airlines
Deal found 12/17$1,807
This United Airlines deal was found by Cheapflights users on 12/16. 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.
Sun 12/285:30 pmLAX - SOF
1 stop19h 15mUnited Airlines
Sun 1/46:05 amSOF - LAX
2 stops25h 50mUnited Airlines
Deal found 12/16$1,831

Find flight deals from Riverside to Sofia

Keep the following information in mind while searching for Riverside to Sofia flight deals. Data was last updated December 18, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$476
(Kiwi.com)

One-way from

$292
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$794
Provider with most accurate pricing for Los Angeles-Sofia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Sofia flights.
Search Deals
From Riverside to Sofia
Search Deals
One-way flight from Riverside to Sofia
Search Deals
Highest demand for flights based on searches. 25% potential increase in price ($263 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($47 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Riverside to Sofia 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 December 18, 2025.
Use the filters below to find and compare flights from Riverside to Sofia that are best for you.

Fly from

Riverside

Fly to

Sofia

Route

Depart

Return

Price

Los AngelesSofia

LAX - SOF

LAXSOF

Los Angeles

Sat 1/17

5:30 pm-6:20 pm

1 stop14h 50m

Sofia

Sat 1/31

6:25 am-10:59 pm

2 stops26h 34m

$483

Los AngelesSofia

LAX - SOF

LAXSOF

Los Angeles

Mon 1/19

5:30 pm-10:45 pm

1 stop19h 15m

Sofia

Wed 2/4

6:10 am-1:05 pm

1 stop16h 55m

$509

Los AngelesSofia

LAX - SOF

LAXSOF

Los Angeles

Mon 1/19

5:30 pm-10:45 pm

1 stop19h 15m

Sofia

Wed 2/4

6:10 am-10:00 pm

2 stops25h 50m

$512

Los AngelesSofia

LAX - SOF

LAXSOF

Los Angeles

Tue 4/14

5:30 pm-11:10 pm

1 stop19h 40m

Sofia

Thu 5/7

6:30 am-1:10 pm

1 stop16h 40m

$520

Los AngelesSofia

LAX - SOF

LAXSOF

Los Angeles

Wed 1/14

5:30 pm-6:20 pm

1 stop14h 50m

Sofia

Wed 1/21

6:10 am-1:05 pm

1 stop16h 55m

$520

Los AngelesSofia

LAX - SOF

LAXSOF

Los Angeles

Thu 2/12

5:30 pm-10:45 pm

1 stop19h 15m

Sofia

Sun 2/22

6:05 am-1:05 pm

2 stops17h 00m

$526

Los AngelesSofia

LAX - SOF

LAXSOF

Los Angeles

Thu 1/22

5:30 pm-10:45 pm

1 stop19h 15m

Sofia

Mon 1/26

6:10 am-1:05 pm

1 stop16h 55m

$531

Los AngelesSofia

LAX - SOF

LAXSOF

Los Angeles

Wed 1/14

7:10 am-9:40 pm

3 stops28h 30m

$320

Los AngelesSofia

LAX - SOF

LAXSOF

Los Angeles

Wed 1/7

3:25 pm-1:30 am

3 stops48h 05m

$374

Los AngelesSofia

LAX - SOF

LAXSOF

Los Angeles

Wed 1/7

5:30 pm-6:20 pm

1 stop14h 50m

$434

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 15 results
1
2

Best time to book a flight from Riverside to Sofia

Have a flexible travel schedule? Discover the best time to fly to Sofia from Riverside 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 Riverside to Sofia

How far ahead should I book a flight from Riverside to Sofia?

Use this chart to determine the optimal time to book a round-trip flight from Riverside to Sofia. Price data was last updated on December 12, 2025.

To ensure you get the cheapest price possible for a flight from Riverside to Sofia, you should look to book at least 36 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Riverside to Sofia?

Currently, November is the cheapest month in which you can book a flight from Riverside to Sofia (average of $489). Flying from Riverside to Sofia in June is currently the most expensive (average of $914). 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.

What is the cheapest time of day to fly from R1V to SOF?

Find hourly flight availability from Riverside to Sofia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2025.

When flying from Riverside to Sofia, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 37% versus a flight in the evening.

What is the cheapest day to fly from Riverside to Sofia?

Use this chart to determine the cheapest time to fly round-trip from Riverside to Sofia. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Riverside to Sofia flight should consider departing on Monday evenings when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Sofia

Get insights into the airlines that provide service to Sofia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sofia. Reviews last updated December 18, 2025.
Read reviews from past customers who have flown Austrian Airlines, United Airlines, and Turkish Airlines from Riverside to Sofia. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Austrian Airlines
7.6
Good
879 reviews

Entertainment

6.8

Food

6.8

Boarding

7.6

Comfort

7.3

Crew

8.1

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
Austrian Airlines
7.6
Good
879 reviews
Austrian Airlines
7.6
Good
879 reviews

Entertainment

6.8

Food

6.8

Boarding

7.6

Comfort

7.3

Crew

8.1

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
United Airlines
7.4
Good
9,092 reviews
Austrian Airlines
7.6
Good
879 reviews

Entertainment

6.8

Food

6.8

Boarding

7.6

Comfort

7.3

Crew

8.1

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
Turkish Airlines
7.3
Good
4,104 reviews
Austrian Airlines
7.6
Good
879 reviews

Entertainment

6.8

Food

6.8

Boarding

7.6

Comfort

7.3

Crew

8.1

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
Lufthansa
6.8
Okay
7,634 reviews
Austrian Airlines
7.6
Good
879 reviews

Entertainment

6.8

Food

6.8

Boarding

7.6

Comfort

7.3

Crew

8.1

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.
British Airways
6.7
Okay
7,583 reviews
Austrian Airlines
7.6
Good
879 reviews

Entertainment

6.8

Food

6.8

Boarding

7.6

Comfort

7.3

Crew

8.1

Overall

7.6

Reviews

1 / 20
10.0
Excellent

Andrew,Sep 2025

FLR - VIE

Staff was really nice, they provided water as a beverage. Otherwise you had to purchase beverages or food. A complementary chocolate was provided at the end of the flight.

Related info for your journey

Find useful and relevant information for your journey from Riverside to Sofia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Sofia from Riverside?

    If you book a flight to Sofia from Riverside, you will be flying to Sofia, which is the city’s only airport. Sofia (SOF) is located 4.2 mi from the center of Sofia. There are 0 flights from Riverside to Sofia per day from 8 different airlines.

  • How long is the flight from Riverside to Sofia?

    Departing from Riverside to Sofia will take you 14h 50m. Airlines will cover a distance of 6613 mi.

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

    The cheapest airlines for a one-way flight from Riverside to Sofia are Lufthansa ($429), Austrian Airlines ($461), and KLM ($469).

  • Can I find deals for flights from Riverside to Sofia that include hotel bookings?

    Yes. In addition to deals on Riverside to Sofia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Riverside to Sofia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Riverside to Sofia.

  • Can I find deals for business class flights from Riverside to Sofia?

    Yes. Cheapflights offers flight deals from Riverside to Sofia 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 Riverside to Sofia?

    Currently, November is the cheapest month in which you can book a flight from Riverside to Sofia (average of $489). Flying from Riverside to Sofia in June is currently the most expensive (average of $914). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 8 airlines flying from Riverside to Sofia

Discover the top 8 airlines that operate flights from Riverside to Sofia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
ITA AirwaysCheapest$530Average$1,286FlexibilityNo cancel feeOn-time81%
United AirlinesCheapest$532Average$1,002FlexibilityNo cancel feeOn-time69%
LOTCheapest$535Average$931FlexibilityNo cancel feeOn-time81%
LufthansaCheapest$535Average$830FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$566Average$947FlexibilityNo cancel feeOn-time70%
Turkish AirlinesCheapest$572Average$710FlexibilityNo cancel feeOn-time77%
KLMCheapest$588Average$793FlexibilityNo cancel feeOn-time75%
Austrian AirlinesCheapest$656Average$946FlexibilityNo cancel feeOn-time78%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.