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Keflavik Intl

$243+ 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 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — KEF
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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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 September 11, 2025.

Round-trip from

$643
(KAYAK)

One-way from

$243
(FlightHub)

Popular in

December

Cheapest in

August

Average price

$934
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. 8% potential increase in price ($86 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($32 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This KAYAK deal was found by Cheapflights users on 9/10. 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
1 stop17h 05mLufthansa
Tue 12/23:20 pmKEF - SFO
1 stop29h 20mLufthansa
Deal found 9/10$643
This KAYAK deal was found by Cheapflights users on 9/11. 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.
Fri 10/249:05 pmSFO - KEF
1 stop20h 05mLufthansa
Thu 11/133:10 pmKEF - SFO
2 stops40h 49mLufthansa
Deal found 9/11$645
This FlightHub deal was found by Cheapflights users on 9/9. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/238:30 amSFO - KEF
1 stop16h 40mMultiple Airlines
Mon 10/612:25 amKEF - SFO
1 stop19h 15mMultiple Airlines
Deal found 9/9$646
This Mytrip deal was found by Cheapflights users on 9/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/67:10 amSFO - KEF
3 stops18h 05mMultiple Airlines
Thu 10/99:35 amKEF - SFO
2 stops20h 33mMultiple Airlines
Deal found 9/9$649
This KAYAK deal was found by Cheapflights users on 9/10. 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.
Tue 11/252:40 pmSFO - KEF
2 stops39h 35mLufthansa
Tue 12/23:20 pmKEF - SFO
1 stop29h 20mLufthansa
Deal found 9/10$650
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Mon 12/16:25 amSFO - KEF
1 stop15h 50mMultiple Airlines
Fri 12/55:00 pmKEF - SFO
1 stop12h 34mMultiple Airlines
Deal found 9/10$651
This Scandinavian Airlines deal was found by Cheapflights users on 9/10. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/277:05 amSFO - KEF
2 stops32h 50mScandinavian Airlines
Thu 12/411:30 amKEF - SFO
1 stop35h 05mScandinavian Airlines
Deal found 9/10$652
This CheapOair deal was found by Cheapflights users on 9/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/19:58 amSFO - KEF
1 stop15h 17mMultiple Airlines
Mon 10/612:25 amKEF - SFO
1 stop19h 15mMultiple Airlines
Deal found 9/10$653
This Scandinavian Airlines deal was found by Cheapflights users on 9/8. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/283:30 pmSFO - KEF
2 stops36h 15mScandinavian Airlines
Thu 11/611:30 amKEF - SFO
2 stops35h 05mScandinavian Airlines
Deal found 9/8$655
This Kiwi.com deal was found by Cheapflights users on 9/8. 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 10/306:34 amSFO - KEF
1 stop16h 31mMultiple Airlines
Mon 11/34:55 pmKEF - SFO
1 stop15h 19mMultiple Airlines
Deal found 9/8$657

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 September 11, 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

Sat 10/4

12:45 am-6:20 am

2 stops22h 35m

Reykjavik Keflavik Intl

Tue 10/14

11:25 am-7:25 am

2 stops27h 00m

$653

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Tue 10/28

3:30 pm-10:45 am

2 stops36h 15m

Reykjavik Keflavik Intl

Thu 11/6

11:30 am-2:35 pm

2 stops35h 05m

$655

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Mon 10/27

8:59 pm-10:45 am

2 stops54h 46m

Reykjavik Keflavik Intl

Sun 11/2

11:15 am-2:35 pm

2 stops35h 20m

$666

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Fri 10/31

10:40 pm-11:35 pm

1 stop17h 55m

Reykjavik Keflavik Intl

Fri 11/7

4:50 pm-12:40 pm

1 stop27h 50m

$667

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Tue 10/7

9:05 pm-11:35 pm

2 stops19h 30m

Reykjavik Keflavik Intl

Tue 10/14

2:20 pm-12:40 pm

1 stop29h 20m

$682

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Sat 10/25

12:35 pm-10:45 am

2 stops39h 10m

Reykjavik Keflavik Intl

Thu 11/13

11:30 am-2:35 pm

1 stop35h 05m

$682

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Thu 10/23

2:40 pm-11:35 pm

1 stop25h 55m

Reykjavik Keflavik Intl

Fri 11/14

4:50 pm-12:40 pm

1 stop27h 50m

$683

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Tue 10/28

6:30 pm-9:15 am

2 stops31h 45m

Reykjavik Keflavik Intl

Mon 11/3

10:00 am-3:00 pm

2 stops37h 00m

$692

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Mon 10/27

8:59 pm-10:45 am

2 stops54h 46m

Reykjavik Keflavik Intl

Thu 11/6

11:30 am-2:35 pm

1 stop35h 05m

$692

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Wed 11/5

12:35 pm-10:45 am

2 stops38h 10m

Reykjavik Keflavik Intl

Sun 11/9

4:25 pm-2:35 pm

2 stops30h 10m

$709

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 16 results
1
2

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 August 29, 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, November is the cheapest month in which you can book a flight from San Francisco to Reykjavik Keflavik Intl Airport (average of $328). Flying from San Francisco to Reykjavik Keflavik Intl Airport in June is currently the most expensive (average of $655). 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 September 11, 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 17% 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.

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 September 11, 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
10,000 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

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
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

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
8.0
Very good
7,960 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

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
8,937 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

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
3,091 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

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
7.0
Good
546 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Overall

8.0

Entertainment

7.0

Crew

8.5

Comfort

7.8

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 Delta, Scandinavian Airlines, and Lufthansa fly from San Francisco to Reykjavik Keflavik Intl Airport in about 17h 55m. The time it takes to get you to your destination can typically vary by up to 18h 20m. San Francisco and Reykjavik Keflavik Intl Airport are separated by a distance of 4190 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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, November is the cheapest month in which you can book a flight from San Francisco to Reykjavik Keflavik Intl Airport (average of $328). Flying from San Francisco to Reykjavik Keflavik Intl Airport in June is currently the most expensive (average of $655). 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$537Average$713FlexibilityNo cancel feeOn-time60%
DeltaCheapest$556Average$806FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$653Average$756FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$655Average$830FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$694Average$929FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$727Average$829FlexibilityNo cancel feeOn-time67%
IcelandairCheapest$841Average$1,059FlexibilityNo cancel feeOn-time76%
Alaska AirlinesCheapest$1,030Average$1,166FlexibilityNo cancel feeOn-time75%

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