$404 Find Cheap Flights from San Francisco to Bulgaria - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Francisco to Bulgaria departing on 8/9. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Cheap Flights from San Francisco to Bulgaria

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Sofia
Sofia2 stops$817
Varna
Varna1 stop$842
Burgas
Burgas2 stops$875
Sofia
Sofia2 stops$817
Varna
Varna1 stop$842
Burgas
Burgas2 stops$875

Book Cheap San Francisco to Bulgaria Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Francisco to Bulgaria that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from San Francisco to Bulgaria

Fri, Oct 30 - Fri, Nov 6
Multiple Airlines Logo
10:40 pm - 11:55 pm
SFO
-
SOF
16h 15m
2 stops
Multiple Airlines Logo
6:25 am - 4:06 pm
SOF
-
SFO
19h 41m
2 stops
$817Multiple Airlines
Tue, Aug 25 - Wed, Sep 16
Multiple Airlines Logo
11:10 am - 6:00 pm
SFO
-
SOF
20h 50m
2 stops
Multiple Airlines Logo
6:20 am - 12:40 pm
SOF
-
SFO
16h 20m
1 stop
$818Multiple Airlines
Tue, Sep 8 - Wed, Sep 23
Multiple Airlines Logo
9:05 pm - 11:15 pm
SFO
-
SOF
16h 10m
1 stop
Multiple Airlines Logo
11:05 am - 6:31 pm
SOF
-
SFO
17h 26m
2 stops
$819Multiple Airlines
Sat, Nov 21 - Sat, Dec 5
United Airlines Logo
11:59 pm - 6:20 pm
SFO
-
SOF
32h 21m
2 stops
United Airlines Logo
6:25 am - 9:28 pm
SOF
-
SFO
25h 03m
2 stops
$821United Airlines
Tue, Sep 8 - Thu, Sep 24
United Airlines Logo
1:55 pm - 6:40 pm
SFO
-
SOF
18h 45m
1 stop
United Airlines Logo
2:10 pm - 7:55 pm
SOF
-
SFO
15h 45m
1 stop
$823United Airlines
Sat, Oct 24 - Sat, Nov 7
Lufthansa Logo
10:40 pm - 10:45 pm
SFO
-
SOF
15h 05m
1 stop
Lufthansa Logo
6:25 am - 12:35 pm
SOF
-
SFO
16h 10m
1 stop
$825Lufthansa
Tue, Aug 25 - Wed, Sep 16
Air Canada Logo
8:10 am - 6:40 pm
SFO
-
SOF
24h 30m
2 stops
Air Canada Logo
6:20 am - 7:49 pm
SOF
-
SFO
23h 29m
2 stops
$827Air Canada
Tue, Aug 11 - Tue, Sep 15
Lufthansa Logo
2:40 pm - 7:15 pm
SFO
-
VAR
18h 35m
1 stop
Lufthansa Logo
11:45 am - 12:40 pm
VAR
-
SFO
34h 55m
1 stop
$842Lufthansa
Tue, Aug 11 - Tue, Sep 15
Austrian Airlines Logo
2:40 pm - 3:15 pm
SFO
-
BOJ
38h 35m
2 stops
Austrian Airlines Logo
1:05 pm - 12:40 pm
BOJ
-
SFO
33h 35m
2 stops
$877Austrian Airlines
Tue, Aug 11 - Tue, Sep 15
Austrian Airlines Logo
2:40 pm - 3:15 pm
SFO
-
BOJ
38h 35m
2 stops
Austrian Airlines Logo
1:05 pm - 12:40 pm
BOJ
-
SFO
33h 35m
2 stops
$878Austrian Airlines
Booking Insights

KAYAK's insights & trends for San Francisco to Bulgaria flights

Get data-powered insights and trends into flights from San Francisco to Bulgaria to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from San Francisco to Bulgaria?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Francisco to Bulgaria, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from San Francisco to Bulgaria is May, when tickets cost $381 (return) on average. On the other hand, the most expensive months are June and September, when the average cost of round-trip tickets is $646 and $615 respectively.

How far in advance should I book a flight from San Francisco to Bulgaria?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from San Francisco to Bulgaria, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from San Francisco to Bulgaria, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 23 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$404
Best time to beat the crowds with an average 12% drop in price.
Most popular time to fly with an average 22% increase in price.
Flight from San Francisco to Sofia

FAQs - booking Bulgaria flights

  • How does KAYAK find such low prices on flights from San Francisco to Bulgaria?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from San Francisco to Bulgaria.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from San Francisco to Bulgaria?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from San Francisco to Bulgaria is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from San Francisco to Bulgaria?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from San Francisco to Bulgaria with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from San Francisco to Bulgaria?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from San Francisco to Bulgaria up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 4 airlines serving from San Francisco to Bulgaria

 
Need help choosing which airline to fly with from San Francisco to Bulgaria? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.5
LOTOverall score based on 1207 reviews
6.9Entertainment
7.5Boarding
7.2Food
7.5Comfort
8.2Crew
Airline reviews

Food seats were good Flight was delayed for over an hour, missed connecting flight, lot automatically rescheduled us to a new flight which was good but lost approximately 4 hours. Not a good way to start a vacation.

8.0 ExcellentAnonymous, Jun 2026
ORD - WAW
Read more LOT reviews

Food seats were good Flight was delayed for over an hour, missed connecting flight, lot automatically rescheduled us to a new flight which was good but lost approximately 4 hours. Not a good way to start a vacation.

Stuck on a plane for 6 hours due to a technical or mechanical issue.

Boarding was a madhouse. Airport staff was completely disinterested in communicating about the delays. Never again.

The seats are very narrow. Communication regarding bids for better seating could be better

During the flight, the fleas biting me in the plane.

The crew and flight were amazing . However , my bag’s locker got broken and no refund provided . Everything else was amazing except this bad incident that ruined my experience

The seats are small and the movie selection was disappointing. However, the food was excellent and the cabin crew was attentive and kind.

Plane is super outdated, seats not that comfortable for business class. Lounge also out dated. They need to catch up to 2024. Don’t think I’d ever fly again.

Aircraft was new. Food so so, especially vegetarian was very disappointing.

Boeng Dreamliner has so tiny seats, so even medium and smaller size people have not enough room to fill comfortable..

Entertainment system is okay, flight attendants were ok. Leg space very narrow, I couldn’t get what I wanted to eat, dinner nor breakfast.

Excellent experience with business class area. Staff was attentive and food was amazing. Only one bathroom for business class which was logistically difficult for the staff while preparing meals. Need to offer fluids with meals. I did not get enough water to drink. But overall I rate it 5 star.

As a big guy the seats are way too small for me. Would prefer more comfortable seats on these long haul flights.

The staff at IST airport could have been more helpful. Too much wasted time and the plane from IST to KHI was just horrible. The plane was not clean and smelled bad!

This is my 2nd time with the Turkish airline. Would definitely recommend. In stability we connected to Indiago would not recommend, very cramped seating. No inflight entertainment..service was inferior.

Vegan food tasted good. Restroom could be kept cleaner. Seat tray table was a bit tilted so food tray kept sliding down a bit. Flight crew can be a little more friendly, caring and approachable. Their faces lacked smiles and tone was stern.

Flight was delayed then we had to redirect for medical emergency during which time we had no information on what is the plan. The connecting flight was also delayed.

Awful seats, poor air circulation. Smelled like poop for 3-5 mins after someone used the bathroom. Child screaming for 13 hours

We are thankful for the useful gifts provided by the airline.The entertainment and crew were also very good

Quality of service on board was very inconsistent. FA service primarily seemed robotic and they barely engaged with passengers

No extra snacks were available. Meals quality is terrible. Crew was not friendly.

Lost one piece of luggage even though I checked in 2.5 hours before the flight

It was perfect! United Airlines staff was extremely caring, super friendly and professional

United has maintenance issues and can then never recover. No operations ability and simple issues always turn into multiple hours long cascading delays. Worst airline on earth.

I paid for a confirmed upgraded aisle seat and was moved to a center seat in the back of the plane at the last minute.

Horrifying Almost 2 million miles. Bring your own food and drink. One coffee or drink every three hours. Have to order meals on app more than 24 hours ahead Tiny and dirty bathrooms

Easy of boarding, helpfully staff at check in, surprisingly comfortable seating

Lost of requested seat assignments. Lost my husband's meal choice

My service dog and I were asked to deplane just before they closed the door - clearly very last minute they couldn’t find the documentation that I have filled out many many times before that is for flying service animals. I purposely purchase 3seats (a whole row) since he is large and not all passengers want to sit next to a dog on a cross country flight. The plane departed with my husband on it!!! They made me fill out a hard copy of the same form and had to reschedule me on a later flight where they could find 3 seats together!! I’ve done this so many times before - clearly the error was on their part in a technology glitch - but really people - do better!! Very traumatic - and my husband had to wait for us when he landed ….so bad. Poor pup was confused and tired.

My flight time was changed without any notification to me which ruined my time sensitive plans so I ended up completely changing my travel plans and no reimbursement.

Flight attendants were fine, seats a bit hard but I use a cushion for extra support. The only issue was it was a bit too cool and I needed to ask for and received and extra blanket. I survived!!!

Food choices limited & not enticing Seats quite uncomfortable & difficult to control

Boarding was disorganized. The door to one to the toilets wouldn’t lock. The plane was shockingly cramped, and clearly used for domestic flights due to the menus for items to sell domestic travelers. United should be ashamed of its small seats, tiny unclean toilets, and money grubbing stance toward services, compared to Lufthansa, Emirates, and most international carriers United is awful.

Service and food were excellent. Incredibly friendly and competent staff. Flight was delayed over and hour and I had to run between terminals to get my connecting flight.

Everything was really great just The aircraft was too old and sounded it will break during takeoff

Extremely pleased with the crew. Best flight attendants ever! Very friendly, genuinely caring and attentive.

Cheapest airlines I have ever been on. I got downgraded and never got on united. I got rerouted through Vancouver onto jetwesf

Very small and uncomfortable seats, Hard to hear entertainment system sound. Horrible food. Staff doesn't care much about the passengers. 2nd time they didn't give me my vegetarian meal. They asked me regular food with meat. The airline and staff was from United airlines.

Lufthansa charged me $280 to take skiiis when in the US the boot bag and skiis are one check-in bag. This was not advertised and a real shock at the airport. They only took the boot bag as a check-in item. The seats have been squeezed together like any economy airline and legroom is not as good as it used to be. Otherwise, the flight was fine and staff was helpful for making my connection.

Professional crew and staff, very organized boarding and on time flights, baggage handling. Indian vegetarian meals were good, though could improve by offering Indian bread (naan/paratha/roti) as well. Very helpful pre flight emails with details of onboard experience 👍 Above average selection of movies. Consider offering more movies with subtitles and ratings indicators (e.g., IMDB scores).

Everything you need to know for your flight from San Francisco to Bulgaria

Information on your arrival and departure airports