HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Keflavik Intl

$635+ Cheap flights from Appleton (ATW) to Keflavik Intl (KEF)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/22. Fares are subject to change and may not be available on all flights or dates of travel.
ATW — KEF
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Appleton to Keflavik Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Appleton to Keflavik Intl

Discover tips and strategies to find the most affordable flight options for your journey from Appleton (ATW) 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 30, 2025.

Round-trip from

$635
(United Airlines)
From Appleton Intl to Reykjavik Keflavik Intl
Search Deals

Find flight deals from Appleton to Keflavik Intl

Cheapest flights from Appleton to Keflavik Intl
Explore the most affordable flight options available from Appleton to Keflavik Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/223:45 pmATW - KEF
1 stop11h 45mUnited Airlines
Tue 8/269:50 amKEF - ATW
2 stops35h 59mUnited Airlines
Deal found 7/28$635
This Lufthansa 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/225:25 pmATW - KEF
2 stops25h 10mLufthansa
Mon 8/2512:25 amKEF - ATW
2 stops21h 24mLufthansa
Deal found 7/29$1,229

Cheapflights Fare Finder

 
Customize your flight search to find flights from Appleton 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 30, 2025.
Use the filters below to find and compare flights from Appleton to Reykjavik Keflavik Intl Airport that are best for you.

Fly from

Appleton

Fly to

Keflavik Intl

Route

Depart

Return

Price

AppletonReykjavik

ATW - KEF

ATWKEF

Appleton Intl

Fri 8/22

6:41 am-8:20 am

2 stops20h 39m

Reykjavik Keflavik Intl

Tue 8/26

9:50 am-4:49 pm

2 stops35h 59m

$635

AppletonReykjavik

ATW - KEF

ATWKEF

Appleton Intl

Fri 8/22

5:25 pm-11:35 pm

2 stops25h 10m

Reykjavik Keflavik Intl

Mon 8/25

12:25 am-4:49 pm

2 stops21h 24m

$1,229

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Best time to book a flight from Appleton to Keflavik Intl

Have a flexible travel schedule? Discover the best time to fly to Keflavik Intl from Appleton 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.

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 30, 2025.
See what other customers who have flown with United Airlines and Lufthansa from Appleton 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.
United Airlines
7.4
Good
8,896 reviews

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,896 reviews
United Airlines
7.4
Good
8,896 reviews

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Lufthansa
6.8
Okay
7,269 reviews
United Airlines
7.4
Good
8,896 reviews

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from Appleton 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 Appleton to Reykjavik Keflavik Intl?

    For a flight from Appleton to Reykjavik Keflavik Intl, you will be flying from Appleton Intl. Appleton Intl (ATW) is just 5.1 mi from the center of the city. Appleton Intl is the only Appleton airport and it handles 0 outbound flights to Reykjavik Keflavik Intl per day. 1 airline has flights to Reykjavik Keflavik Intl from Appleton Intl on a regular basis.

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

    United Airlines, at $635, was found to be the cheapest airline from Appleton to Reykjavik Keflavik Intl Airport. An alternate airline flying to your destination would be Lufthansa.

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

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

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

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

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

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

    Currently, November is the cheapest month in which you can book a flight from Appleton to Reykjavik Keflavik Intl Airport (average of $328). Flying from Appleton 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top airline flying from Appleton to Keflavik Intl

Discover the top airline that operate flights from Appleton 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 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$838Average$887FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.