Title: £413 Cheap Flights from Sofia to San Francisco (SOF to SFO) - Expedia.co.uk ![Sunset view of the Golden Gate Bridge and fog from Battery Spencer, Golden Gate National Recreation Area, in San Francisco, California.](https://images.trvl-media.com/place/508803/0ac688ba-e7fa-4fb1-9f85-037d98869bf8.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/508803/0ac688ba-e7fa-4fb1-9f85-037d98869bf8.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # £413 Cheap Flights from Sofia (SOF) to San Francisco (SFO) [View £413 flight on Mon, 16 Feb 2026](https://expedia.co.uk/Flights-Search?trip=oneway&leg1=from:SOF,to:SFO,departure:16/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:412.94&airProductToken=AQqeAQoyCMKCARIDODkxGNIrIOuJASi9qYUDMI-rhQM4T0AAWAFqBU5PQkFHcglPTE41QzVCV1AKMwjCggESAzI4MxjriQEgi7gBKJ2yhQMwyreFAzhPQAFYAWoFTk9CQUdyCU9MTjVDNUJXUAozCMKCARIENDgwORiLuAEgsnEouLqFAzCMu4UDOE9AAVgBagVOT0JBR3IJT0xONUM1QldQEgoIARABGAEqAkJBGAEiBAgBEAEoAigDMA0) - [Return](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travellers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only ## Popular airlines from Sofia Airport (SOF) to San Francisco International Airport (SFO) - ![Turkish Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_TK.svg) Turkish Airlines [](https://www.expedia.co.uk/Flights-Search?leg1=from:sof,to:sfo,departure:03/10/2025TANYT&leg2=from:sfo,to:sof,departure:10/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"TK"}}]) - ![Austrian Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_OS.svg) Austrian Airlines [](https://www.expedia.co.uk/Flights-Search?leg1=from:sof,to:sfo,departure:03/10/2025TANYT&leg2=from:sfo,to:sof,departure:10/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"OS"}}]) - ![Lufthansa](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_LH.svg) Lufthansa [](https://www.expedia.co.uk/Flights-Search?leg1=from:sof,to:sfo,departure:03/10/2025TANYT&leg2=from:sfo,to:sof,departure:10/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"LH"}}]) - ![Air Canada](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AC.svg) Air Canada [](https://www.expedia.co.uk/Flights-Search?leg1=from:sof,to:sfo,departure:03/10/2025TANYT&leg2=from:sfo,to:sof,departure:10/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AC"}}]) - ![British Airways](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_BA.svg) British Airways [](https://www.expedia.co.uk/Flights-Search?leg1=from:sof,to:sfo,departure:03/10/2025TANYT&leg2=from:sfo,to:sof,departure:10/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"BA"}}]) - ![Swiss International Air Lines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_LX.svg) Swiss International Air Lines [](https://www.expedia.co.uk/Flights-Search?leg1=from:sof,to:sfo,departure:03/10/2025TANYT&leg2=from:sfo,to:sof,departure:10/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"LX"}}]) - ![United](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_UA.svg) United [](https://www.expedia.co.uk/Flights-Search?leg1=from:sof,to:sfo,departure:03/10/2025TANYT&leg2=from:sfo,to:sof,departure:10/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) ![notification illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* ![deals illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 25% on select hotels after you book a flight\* ![trophy illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.co.uk/login) ## Cheap Flights from Sofia (SOF) to San Francisco (SFO) Prices were available within the past 7 days and start at £413 for one-way flights and £585 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Return ![Turkish Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/TK.gif) Tue, 4 Nov - Sat, 8 Nov SOF Sofia SFO San Francisco £585 Return found 1 day ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:SOF,to:SFO,departure:04/11/2025TANYT&leg2=from:SFO,to:SOF,departure:08/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:584.90&airProductToken=AQpeCi4I1JYBEgQxMDI4GNIrIMicASiFlPwCMN-U_AI4V0AAWAFqAlBTcgdXTjNGRVNUCiwI1JYBEgI3ORjInAEgsnEoqpX8AjDtm_wCOFdAAVgBagJQU3IHV04zRkVTVApfCi0I1JYBEgMyOTAYsnEgyJwBKJbH_AIwsc38AjhXQABYAWoCUFNyB1dOM0ZFU1QKLgjUlgESBDEwMzEYyJwBINIrKIbO_AIw1s78AjhXQAFYAWoCUFNyB1dOM0ZFU1QSCggBEAEYASoCVEsYASIECAEQASgCKAMoBDAB) ![Turkish Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/TK.gif) Sat, 1 Nov - Sun, 30 Nov SOF Sofia SFO San Francisco £611 Return found 3 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:SOF,to:SFO,departure:01/11/2025TANYT&leg2=from:SFO,to:SOF,departure:30/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:610.90&airProductToken=AQpfCi4I1JYBEgQxMDMwGNIrIMicASjc9_sCMLv4-wI4V0AAWAFqAlBTcgdXTjNGRVNUCi0I1JYBEgMyODkYyJwBILJxKJH8-wIw2YL8AjhXQAFYAWoCUFNyB1dOM0ZFU1QKXwotCNSWARIDMjkwGLJxIMicASjWvv4CMPHE_gI4UEAAWAFqAlBTcgdQTjNGRVNUCi4I1JYBEgQxMDMxGMicASDSKyjGxf4CMJbG_gI4UEABWAFqAlBTcgdQTjNGRVNUEgoIARABGAEqAlRLGAEiBAgBEAEoAigDKAQwAQ) ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Sun, 12 Oct - Sun, 19 Oct SOF Sofia SFO San Francisco £641 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:SOF,to:SFO,departure:12/10/2025TANYT&leg2=from:SFO,to:SOF,departure:19/10/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:640.64&airProductToken=AQqcAQoxCMKCARIDODkzGNIrIOuJASiClvoCMMWX-gI4UUAAWAFqBU5PQkFHcghRS043VDhCVwozCMKCARIEMTYwORjriQEgi7gBKJmf-gIwwaT6AjhRQAFYAWoFTk9CQUdyCFFLTjdUOEJXCjIIwoIBEgQ1MTEyGIu4ASCycSj1pfoCMMqm-gI4UUABWAFqBU5PQkFHcghRS043VDhCVwpmCjEIwoIBEgMyODQYsnEg64kBKKLn-gIwk-z6AjhPQABYAWoFTk9CQUdyCE9MTjdUOEI0CjEIwoIBEgM4OTIY64kBINIrKMzt-gIwiu_6AjhPQAFYAWoFTk9CQUdyCE9MTjdUOEI0EgoIAhABGAIqAkJBGAEiBAgBEAEoAigDKAQwAQ) ![Lufthansa](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LH.gif) Wed, 29 Oct - Fri, 28 Nov SOF Sofia SFO San Francisco £647 Return found 3 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:SOF,to:SFO,departure:29/10/2025TANYT&leg2=from:SFO,to:SOF,departure:28/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:646.50&airProductToken=AQpsCjQIzJABEgQxNDMxGNIrIKUEKNrO-wIw9c_7AjhLQABYAWoIRUNPTElHSFRyCEtNUThEWEJRCjQIzJABEgQ5NDA4GKUEILJxKLnU-wIw-tn7AjhLQAFYAWoIRUNPTElHSFRyCEtNUThEWEJRCmoKMgjMsAESAjM5GLJxILk8KI2r_gIwprD-AjhLQABYAWoIRUNPTElHSFRyCEtNUThEWEJRCjQIzLABEgQxMzkwGLk8INIrKMi3_gIwz7j-AjhLQAFYAWoIRUNPTElHSFRyCEtNUThEWEJREgoIAhABGAIqAkxIGAEiBAgBEAEoAigDKAQwCw) ![Lufthansa](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LH.gif) Wed, 29 Oct - Fri, 28 Nov SOF Sofia SFO San Francisco £649 Return found 3 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:SOF,to:SFO,departure:29/10/2025TANYT&leg2=from:SFO,to:SOF,departure:28/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:648.30&airProductToken=AQpsCjQIzJABEgQxNDMxGNIrIKUEKNrO-wIw9c_7AjhLQABYAWoIRUNPTElHSFRyCEtNUThEWEJRCjQIzJABEgQ5NDEwGKUEILJxKMTS-wIw-9f7AjhLQAFYAWoIRUNPTElHSFRyCEtNUThEWEJRCmsKMwjMkAESAzQ1ORiycSCMFSiUrP4CMLex_gI4S0AAWAFqCEVDT0xJR0hUcghLTVE4RFhCUQo0CMyQARIEMTcwNhiMFSDSKyivsv4CMJ2z_gI4S0ABWAFqCEVDT0xJR0hUcghLTVE4RFhCURIKCAIQARgCKgJMSBgBIgQIARABKAIoAygEMAs) ![Air Canada](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AC.gif) Wed, 29 Oct - Fri, 28 Nov SOF Sofia SFO San Francisco £650 Return found 3 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:SOF,to:SFO,departure:29/10/2025TANYT&leg2=from:SFO,to:SOF,departure:28/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:649.80&airProductToken=AQqXAQoxCMGGARIEOTA0MRjSKyClBCjazvsCMPXP-wI4S0AAWAFqBUJBU0lDcghLTVE4RFhCUQowCMGGARIDODQ1GKUEIJhdKO3Q-wIw3NT7AjhLQAFYAWoFQkFTSUNyCEtNUThEWEJRCjAIwYYBEgM3NjEYmF0gsnEo_tb7AjCG2vsCOEtAAVgBagVCQVNJQ3IIS01ROERYQlEKmwEKMgjBhgESBDg4NDMYsnEguI0BKMKl_gIw06b-AjhLQABYAWoFQkFTSUNyCEtNUThEWEJRCjIIwYYBEgQ5MTAwGLiNASClBCi-qP4CMJut_gI4S0ABWAFqBUJBU0lDcghLTVE4RFhCUQoxCMGGARIEOTQ4NxilBCDSKyjwrf4CMPeu_gI4S0ABWAFqBUJBU0lDcghLTVE4RFhCURIKCAIQARgCKgJBQxgBIgQIARABKAIoAygEMAE) ![Lufthansa](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LH.gif) Tue, 28 Oct - Thu, 27 Nov SOF Sofia SFO San Francisco £653 Return found 3 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:SOF,to:SFO,departure:28/10/2025TANYT&leg2=from:SFO,to:SOF,departure:27/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:652.80&airProductToken=AQprCjQIzJABEgQxNDMxGNIrIKUEKLDD-wIwy8T7AjhLQABYAWoIRUNPTElHSFRyCEtNUThEWEJRCjMIzJABEgM0NTQYpQQgsnEo5sX7AjCYy_sCOEtAAVgBaghFQ09MSUdIVHIIS01ROERYQlEKoQEKNQjPpgESBDc5OTAYsnEgxI0BKISa_gIwyJz-AjhLQABYAWoIRUNPTElHSFRyCEtNUThEWEJRCjMIz6YBEgIzOBjEjQEglSIo353-AjDEof4COEtAAVgBaghFQ09MSUdIVHIIS01ROERYQlEKMwjPpgESAzc3MRiVIiDSKyiUov4CMO6i_gI4S0ABWAFqCEVDT0xJR0hUcghLTVE4RFhCURIKCAIQARgCKgJMSBgBIgQIARABKAIoAygEMAs) ![Air Canada](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AC.gif) Wed, 29 Oct - Fri, 28 Nov SOF Sofia SFO San Francisco £655 Return found 3 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:SOF,to:SFO,departure:29/10/2025TANYT&leg2=from:SFO,to:SOF,departure:28/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:654.70&airProductToken=AQqXAQoxCMGGARIEOTA0MRjSKyClBCjazvsCMPXP-wI4S0AAWAFqBUJBU0lDcghLTVE4RFhCUQowCMGGARIDODQ1GKUEIJhdKO3Q-wIw3NT7AjhLQAFYAWoFQkFTSUNyCEtNUThEWEJRCjAIwYYBEgM3NjEYmF0gsnEo_tb7AjCG2vsCOEtAAVgBagVCQVNJQ3IIS01ROERYQlEKmwEKMgjBhgESBDM0NTUYsnEgmM4BKJKm_gIwwKj-AjhLQABYAWoFQkFTSUNyCEtNUThEWEJRCjIIwYYBEgQ5MTA0GJjOASClBCiTqf4CMN-s_gI4S0ABWAFqBUJBU0lDcghLTVE4RFhCUQoxCMGGARIEOTQ4NxilBCDSKyjwrf4CMPeu_gI4S0ABWAFqBUJBU0lDcghLTVE4RFhCURIKCAIQARgCKgJBQxgBIgQIARABKAIoAygEMAE) ![Lufthansa](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LH.gif) Wed, 29 Oct - Fri, 28 Nov SOF Sofia SFO San Francisco £657 Return found 3 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:SOF,to:SFO,departure:29/10/2025TANYT&leg2=from:SFO,to:SOF,departure:28/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:656.10&airProductToken=AQprCjQIzJABEgQxNzAzGNIrIIwVKLDS-wIwstP7AjhLQABYAWoIRUNPTElHSFRyCEtNUThEWEJRCjMIzJABEgM0NTgYjBUgsnEogtT7AjDX2fsCOEtAAVgBaghFQ09MSUdIVHIIS01ROERYQlEKagoyCMywARICMzkYsnEguTwojav-AjCmsP4COEtAAFgBaghFQ09MSUdIVHIIS01ROERYQlEKNAjMsAESBDEzOTAYuTwg0isoyLf-AjDPuP4COEtAAVgBaghFQ09MSUdIVHIIS01ROERYQlESCggCEAEYAioCTEgYASIECAEQASgCKAMoBDAL) ![Swiss International Air Lines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LX.gif) Wed, 15 Oct - Wed, 22 Oct SOF Sofia SFO San Francisco £657 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:SOF,to:SFO,departure:15/10/2025TANYT&leg2=from:SFO,to:SOF,departure:22/10/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:656.80&airProductToken=AQpqCjQIzLABEgQxMzkxGNIrILk8KPay-gIwgrT6AjhLQABYAWoIRUNPTElHSFRyCEtNUThEWEJRCjIIzLABEgIzOBi5PCCycSi-tPoCMI66-gI4S0ABWAFqCEVDT0xJR0hUcghLTVE4RFhCUQpsCjQIzJABEgQ5NDA3GLJxIKUEKLGK-wIwu4_7AjhLQABYAWoIRUNPTElHSFRyCEtNUThEWEJRCjQIzJABEgQxNDMwGKUEINIrKMSR-wIwxpL7AjhLQAFYAWoIRUNPTElHSFRyCEtNUThEWEJREgoIAhABGAIqAkxYGAEiBAgBEAEoAigDKAQwCw) Flight from Sofia to San Francisco route information | Origin airport | Sofia | | --- | --- | | Destination airport | San Francisco Intl. | | Airlines serving | Air Canada, Austrian Airlines, Lufthansa, Swiss International Air Lines, Turkish Airlines | | Return price | £585 | | Distance | 10377 km | ## Compare flights from Sofia to San Francisco easily and book with confidence For travelling on business or for pleasure, Expedia makes it easy to book your flights from Sofia to San Francisco. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to San Francisco Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Sofia to San Francisco Intl..   To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights.  Grab a great deal on your flight from Sofia (SOF) to San Francisco Intl. (SFO) The easiest way to view the best deals on flights from Sofia to San Francisco today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Sofia to San Francisco Intl. start at just £585 and range up to £668.   To find an even better deal, try   - being flexible on your dates – midweek flights can be cheaper - looking for other airports near Sofia and San Francisco - booking your flight during November, the cheapest month on this route - varying your flight times – early morning and late at night are sometimes cheaper  Why you should book your Sofia to San Francisco flight with Expedia! We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Sofia to San Francisco Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.   Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.   ## Frequently asked questions ### How much is a flight from Sofia Intl. Airport to SFO? > If you're planning on travelling between Sofia Airport (SOF) and San Francisco Airport, round-trip journeys start from £585. This price is based on airfares listed within the last 7 days on Expedia for flights departing within the next year, so don't wait around. Book now and save yourself both money and time. Prices and availability are subject to change. Additional terms apply. ### Do I need to pay a cancellation fee if I cancel my flight from Sofia Intl. Airport to San Francisco Airport? > The majority of flights can be cancelled online, but each airline has its own set of terms and conditions. If you do have to cancel your flight, go to our [Customer Service Portal](https://www.expedia.co.uk/service/?langid=1033) and follow the instructions. ### How do I find cheap flights from Sofia Intl. Airport to SFO that have flexible change policies? > Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Sofia Airport (SOF) to San Francisco Airport flights, you'll see a "no change fees" filter for you to select. ### How far is the flight from SOF to San Francisco Intl. Airport (SFO)? > The distance is around 10,500 kilometres, so pack your carry-on bag with all the things you need to make the long journey comfortable. Not sure what to take on board your Sofia to San Francisco flight? A travel pillow, earplugs and a sleep mask are among the essentials. ### Which airlines fly direct from Sofia Airport (SOF) to SFO? > Direct flights aren't available, so you'll need to make at least one stop between SOF and SFO. Take advantage of the layover time to stretch your legs and grab a bite to eat. ### Are Sofia Intl. Airport to San Francisco Airport flight tickets cheaper when they're purchased at the last minute? > Late planners can sometimes nab a bargain, with some of the cheapest fares from Sofia Intl. Airport to San Francisco Airport arising a few weeks before the date of departure. If you'd rather book ahead, Expedia compares and updates the best flight deals regularly — as early as a year in advance in some cases. 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