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Keflavik Intl

$273+ 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
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 July 29, 2025.

Round-trip from

$652
(United Airlines)

One-way from

$273
(oojo)

Popular in

December

Cheapest in

August

Average price

$995
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. 7% potential increase in price ($79 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 July 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 July 29, 2025.

This United Airlines deal was found by Cheapflights users on 7/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1611:03 pmSFO - KEF
2 stops26h 27mUnited Airlines
Tue 8/269:50 amKEF - SFO
2 stops35h 45mUnited Airlines
Deal found 7/27$652
This KLM deal was found by Cheapflights users on 7/29. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2911:35 amSFO - KEF
1 stop11h 45mMultiple Airlines
Fri 8/19:30 amKEF - SFO
1 stop14h 45mMultiple Airlines
Deal found 7/29$653
This Air Canada deal was found by Cheapflights users on 7/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/1711:25 pmSFO - KEF
2 stops25h 50mAir Canada
Tue 8/269:50 amKEF - SFO
1 stop16h 08mAir Canada
Deal found 7/27$655
This Delta deal was found by Cheapflights users on 7/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/295:55 amSFO - KEF
2 stops17h 25mDelta
Fri 8/18:50 amKEF - SFO
1 stop16h 29mDelta
Deal found 7/27$658
This oojo deal was found by Cheapflights users on 7/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/77:40 pmSFO - KEF
1 stop30h 50mScandinavian Airlines
Sun 10/195:10 pmKEF - SFO
1 stop30h 20mScandinavian Airlines
Deal found 7/27$668
This British Airways deal was found by Cheapflights users on 7/28. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/298:40 pmSFO - KEF
2 stops28h 35mBritish Airways
Fri 1/911:50 amKEF - SFO
2 stops30h 00mBritish Airways
Deal found 7/28$669
This Kiwi.com deal was found by Cheapflights users on 7/29. 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.
Sun 9/2112:50 pmSFO - KEF
1 stop12h 25mWestJet
Thu 10/29:35 amKEF - SFO
1 stop18h 49mWestJet
Deal found 7/29$674
This FlightHub deal was found by Cheapflights users on 7/29. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/192:40 pmSFO - KEF
1 stop25h 55mLufthansa
Sun 11/24:45 pmKEF - SFO
1 stop27h 55mLufthansa
Deal found 7/29$682

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 July 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

Sat 8/16

11:03 pm-8:30 am

2 stops26h 27m

Reykjavik Keflavik Intl

Tue 8/26

9:50 am-2:35 pm

2 stops35h 45m

$652

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Sat 9/20

11:00 pm-4:55 am

2 stops22h 55m

Reykjavik Keflavik Intl

Thu 10/2

9:35 am-9:24 pm

1 stop18h 49m

$653

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Sun 8/3

5:50 am-6:20 am

1 stop17h 30m

Reykjavik Keflavik Intl

Mon 8/11

8:50 am-9:49 pm

1 stop19h 59m

$654

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Sun 8/17

11:25 pm-8:15 am

2 stops25h 50m

Reykjavik Keflavik Intl

Tue 8/26

9:50 am-6:58 pm

1 stop16h 08m

$655

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Tue 10/7

7:40 pm-9:30 am

1 stop30h 50m

Reykjavik Keflavik Intl

Sun 10/19

5:10 pm-4:30 pm

1 stop30h 20m

$668

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Sun 9/21

7:30 am-8:15 am

1 stop17h 45m

Reykjavik Keflavik Intl

Thu 10/2

9:35 am-9:24 pm

1 stop18h 49m

$675

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Sun 10/19

2:40 pm-11:35 pm

1 stop25h 55m

Reykjavik Keflavik Intl

Sun 11/2

4:45 pm-12:40 pm

1 stop27h 55m

$682

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Fri 10/10

12:50 pm-8:15 am

1 stop12h 25m

$273

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Sun 9/28

10:15 am-8:15 am

2 stops15h 00m

$314

San FranciscoReykjavik

SFO - KEF

SFOKEF

San Francisco

Fri 10/10

7:40 pm-3:20 pm

2 stops36h 40m

$511

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Showing 1-10 of 14 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 July 25, 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 $653). 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 July 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 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 July 29, 2025.
See what other customers who have flown with Delta, United Airlines, and Scandinavian 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.
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,979 reviews
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,896 reviews
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Scandinavian Airlines
7.3
Good
1,449 reviews
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
WestJet
7.2
Good
2,972 reviews
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air Canada
7.1
Good
9,826 reviews
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 9 different airlines.

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

    According to our current data, United Airlines ($652), Delta ($654), and Air Canada ($655) offers the cheapest pricing from San Francisco to Reykjavik Keflavik Intl Airport. United Airlines is priced at 32% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from San Francisco to Reykjavik Keflavik Intl Airport one-way?

    One-way options have recently been found by users for as low as $273 on WestJet. Other airlines that offer cheap prices include Scandinavian Airlines from $511 and Air Canada from $513 one-way.

  • 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 $653). 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 9 airlines flying from San Francisco to Keflavik Intl

Discover the top 9 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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$519Average$700FlexibilityNo cancel feeOn-time60%
DeltaCheapest$556Average$793FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$653Average$757FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$655Average$830FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$694Average$932FlexibilityNo cancel feeOn-time69%
KLMCheapest$739Average$949FlexibilityNo cancel feeOn-time75%
Air CanadaCheapest$740Average$858FlexibilityNo cancel feeOn-time67%
IcelandairCheapest$849Average$1,057FlexibilityNo cancel feeOn-time76%
Alaska AirlinesCheapest$1,030Average$1,168FlexibilityNo cancel feeOn-time75%

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