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Keflavik Intl

$304+ Cheap flights from San Francisco (SFO) to Keflavik Intl (KEF)

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 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — KEF
Nov 28 — Dec 51
Fri 11/28
Fri 12/5
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from San Francisco to Reykjavik Keflavik Intl are usually found in August or February, booked 89 days in advance, depart on a Monday or Tuesday and return on a Monday

Cheap flight deals from San Francisco to Keflavik Intl

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Keflavik Intl (KEF). 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 29, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$522
(KAYAK)

One-way from

$304
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$995
Provider with most accurate pricing for San Francisco-Reykjavik Keflavik Intl flight deals.
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Provider most trusted by Cheapflights users for San Francisco-Reykjavik Keflavik Intl flights.
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From San Francisco to Reykjavik Keflavik Intl
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One-way flight from San Francisco to Reykjavik Keflavik Intl
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Highest demand for flights based on searches. 12% potential increase in price ($141 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($45 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find flight deals from San Francisco to Keflavik Intl

Cheapest flights from San Francisco to Keflavik Intl
Explore the most affordable flight options available from San Francisco to Keflavik Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 29, 2025.

This KAYAK deal was found by Cheapflights users on 10/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/277:25 pmSFO - KEF
1 stop33h 55mSWISS
Sat 12/62:20 pmKEF - SFO
1 stop34h 10mSWISS
Deal found 10/28$522
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/277:25 pmSFO - KEF
1 stop33h 55mSWISS
Sat 12/132:20 pmKEF - SFO
1 stop34h 10mSWISS
Deal found 10/29$524
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/47:25 pmSFO - KEF
1 stop33h 55mMultiple Airlines
Tue 12/93:20 pmKEF - SFO
1 stop29h 20mMultiple Airlines
Deal found 10/29$574
This KAYAK deal was found by Cheapflights users on 10/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/272:40 pmSFO - KEF
2 stops38h 40mLufthansa
Sat 12/62:20 pmKEF - SFO
2 stops37h 15mLufthansa
Deal found 10/28$596
This KAYAK deal was found by Cheapflights users on 10/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/272:40 pmSFO - KEF
2 stops38h 40mLufthansa
Fri 12/53:25 pmKEF - SFO
2 stops36h 10mLufthansa
Deal found 10/28$616
This Gurufare deal was found by Cheapflights users on 10/28. 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.
Thu 11/277:25 pmSFO - KEF
1 stop33h 55mMultiple Airlines
Tue 12/23:20 pmKEF - SFO
1 stop29h 20mMultiple Airlines
Deal found 10/28$620
This KAYAK deal was found by Cheapflights users on 10/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/245:30 pmSFO - KEF
1 stop33h 20mBritish Airways
Thu 12/411:45 amKEF - SFO
1 stop35h 15mBritish Airways
Deal found 10/28$626
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 12/49:00 amSFO - KEF
1 stop13h 15mMultiple Airlines
Wed 12/105:00 pmKEF - SFO
1 stop12h 34mMultiple Airlines
Deal found 10/27$627
This KAYAK deal was found by Cheapflights users on 10/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/272:40 pmSFO - KEF
2 stops38h 40mLufthansa
Tue 12/23:20 pmKEF - SFO
1 stop29h 20mLufthansa
Deal found 10/28$643

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Francisco to Keflavik Intl 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 29, 2025.
Use the filters below to find and compare flights from San Francisco to Reykjavik Keflavik Intl Airport that are best for you.

Fly from

San Francisco

Fly to

Keflavik Intl

Route

Depart

Return

Price

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Mon 3/2

8:40 pm-9:15 am

2 stops28h 35m

Reykjavik Keflavik Intl

Tue 3/31

8:35 am-8:58 pm

2 stops19h 23m

$606

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Tue 4/7

10:40 am-4:25 pm

2 stops22h 45m

Reykjavik Keflavik Intl

Tue 4/14

8:35 am-9:04 pm

2 stops19h 29m

$617

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Mon 1/12

8:40 pm-9:00 am

2 stops28h 20m

Reykjavik Keflavik Intl

Tue 1/20

10:00 am-12:47 am

2 stops22h 47m

$642

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Thu 12/11

9:40 pm-1:20 pm

2 stops31h 40m

Reykjavik Keflavik Intl

Tue 12/23

3:20 pm-12:40 pm

1 stop29h 20m

$658

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Thu 4/2

2:30 pm-4:25 pm

2 stops18h 55m

Reykjavik Keflavik Intl

Wed 4/8

5:10 pm-9:04 pm

2 stops34h 54m

$677

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Tue 1/13

2:40 pm-2:15 pm

2 stops39h 35m

Reykjavik Keflavik Intl

Sun 1/18

3:20 pm-12:40 pm

1 stop29h 20m

$684

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Fri 1/9

9:40 pm-2:20 pm

2 stops32h 40m

Reykjavik Keflavik Intl

Fri 1/23

3:25 pm-5:36 pm

2 stops34h 11m

$697

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Sat 1/10

4:40 pm-4:50 pm

1 stop16h 10m

Reykjavik Keflavik Intl

Thu 1/22

11:30 am-2:35 pm

1 stop35h 05m

$701

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Sun 3/22

6:30 pm-9:15 am

2 stops31h 45m

Reykjavik Keflavik Intl

Sun 3/29

8:35 am-12:20 am

2 stops22h 45m

$702

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Wed 12/3

12:25 pm-11:55 pm

2 stops27h 30m

Reykjavik Keflavik Intl

Sun 12/7

11:15 am-2:35 pm

2 stops35h 20m

$703

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 19 results
1
2

Compare providers for flights from San Francisco to Keflavik Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from San Francisco to Keflavik Intl in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*3 stars
Trip.comPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on San Francisco-Reykjavik Keflavik Intl Airport flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on San Francisco-Reykjavik Keflavik Intl Airport flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from San Francisco-Reykjavik Keflavik Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Francisco-Reykjavik Keflavik Intl Airport flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Francisco-Reykjavik Keflavik Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from San Francisco to Keflavik Intl

Have a flexible travel schedule? Discover the best time to fly to Keflavik Intl from San Francisco 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 San Francisco to Reykjavik Keflavik Intl Airport

How far ahead should I book a flight from San Francisco to Reykjavik Keflavik Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from San Francisco to Keflavik Intl. Price data was last updated on October 24, 2025.

Booking 89 days in advance of your planned departure date is, on average, the best time to get cheap flights from San Francisco to Reykjavik Keflavik Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from San Francisco to Reykjavik Keflavik Intl Airport?

Currently, April is the cheapest month in which you can book a flight from San Francisco to Reykjavik Keflavik Intl Airport (average of $167). Flying from San Francisco to Reykjavik Keflavik Intl Airport in January is currently the most expensive (average of $853). 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 SFO to KEF?

Find hourly flight availability from San Francisco to Keflavik Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 29, 2025.

It’s optimal to fly from San Francisco to Reykjavik Keflavik Intl Airport in the evening. By choosing this option you can save up to 16% on the cost of your flight, compared to a flight at noon.

What is the cheapest day to fly from San Francisco to Reykjavik Keflavik Intl Airport?

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

Travelers seeking maximum savings on their San Francisco to Reykjavik Keflavik Intl Airport flight should consider departing on Tuesday evenings when fares are most often at their lowest. Thursday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost to fly round-trip from San Francisco to Reykjavik Keflavik Intl Airport?

Reviews of airlines servicing Keflavik Intl

Get insights into the airlines that provide service to Keflavik Intl. 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 Keflavik Intl. Reviews last updated October 29, 2025.
See what other customers who have flown with Alaska Airlines, Delta, and United Airlines from San Francisco to Reykjavik Keflavik Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,206 reviews

Comfort

7.8

Overall

8.0

Food

7.1

Crew

8.5

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
11,206 reviews
Alaska Airlines
8.0
Very good
11,206 reviews

Comfort

7.8

Overall

8.0

Food

7.1

Crew

8.5

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Delta
7.9
Good
7,993 reviews
Alaska Airlines
8.0
Very good
11,206 reviews

Comfort

7.8

Overall

8.0

Food

7.1

Crew

8.5

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
9,001 reviews
Alaska Airlines
8.0
Very good
11,206 reviews

Comfort

7.8

Overall

8.0

Food

7.1

Crew

8.5

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
WestJet
7.2
Good
3,148 reviews
Alaska Airlines
8.0
Very good
11,206 reviews

Comfort

7.8

Overall

8.0

Food

7.1

Crew

8.5

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Icelandair
7.1
Good
562 reviews
Alaska Airlines
8.0
Very good
11,206 reviews

Comfort

7.8

Overall

8.0

Food

7.1

Crew

8.5

Entertainment

7.0

Boarding

8.1

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Keflavik Intl. 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 from for flights from San Francisco to Reykjavik Keflavik Intl?

    Located just 11.8 mi from the city center, San Francisco is the airport most travelers will use when flying to Reykjavik Keflavik Intl from San Francisco. Booking flights from San Francisco (SFO) to Reykjavik Keflavik Intl should be relatively easy as there are 0 daily outbound flights to Reykjavik Keflavik Intl from 8 different airlines.

  • How long is the flight from San Francisco to Reykjavik Keflavik Intl Airport?

    Airlines like Finnair fly from San Francisco to Reykjavik Keflavik Intl Airport in about 28h 35m. The time it takes to get you to your destination can typically vary by up to . San Francisco and Reykjavik Keflavik Intl Airport are separated by a distance of 4190 mi.

  • What are the cheapest airlines flying from San Francisco to Reykjavik Keflavik Intl Airport round-trip?

    According to our current data, WestJet ($537), Delta ($556), and Scandinavian Airlines ($653) offers the cheapest pricing from San Francisco to Reykjavik Keflavik Intl Airport. WestJet is priced at 44% lower than the current average price of a flight leaving 3 months from now.

  • Can I find deals for flights from San Francisco to Keflavik Intl that include hotel bookings?

    Yes. In addition to deals on San Francisco to Keflavik Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Francisco to Keflavik Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Keflavik Intl.

  • Can I find deals for business class flights from San Francisco to Keflavik Intl?

    Yes. Cheapflights offers flight deals from San Francisco to Keflavik Intl 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 San Francisco to Reykjavik Keflavik Intl Airport?

    Currently, April is the cheapest month in which you can book a flight from San Francisco to Reykjavik Keflavik Intl Airport (average of $167). Flying from San Francisco to Reykjavik Keflavik Intl Airport in January is currently the most expensive (average of $853). 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

Traveling to a place near Reykjavik Keflavik Intl Airport?

Book flights to Reykjavik Keflavik Intl Airport if you plan to visit one of these locations
Keflavik
Hveragerdi

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Top 8 airlines flying from San Francisco to Keflavik Intl

Discover the top 8 airlines that operate flights from San Francisco to Keflavik Intl. 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 October 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$537Average$713FlexibilityNo cancel feeOn-time60%
DeltaCheapest$556Average$793FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$653Average$755FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$655Average$830FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$684Average$921FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$700Average$823FlexibilityNo cancel feeOn-time67%
IcelandairCheapest$840Average$1,064FlexibilityNo cancel feeOn-time76%
Alaska AirlinesCheapest$1,022Average$1,153FlexibilityNo cancel feeOn-time75%

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