Find the cheapest flights from Reykjavik Keflavik Intl Airport to Seattle
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Cheap direct flights
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.United Airlines flights from Reykjavik Keflavik Intl Airport to Seattle
Our best United Airlines deals on Reykjavik Keflavik Intl Airport to Seattle flight tickets
Icelandair flights from Reykjavik Keflavik Intl Airport to Seattle
Our best Icelandair deals on Reykjavik Keflavik Intl Airport to Seattle flight tickets
momondo Fare Finder
Use the filters below to find and compare flights from Reykjavik Keflavik Intl Airport to Seattle that are best for you.
Fly from
Fly to
Route
Depart
Return
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Wed 12/23
5:00 pm-5:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Tue 1/5
2:35 pm-6:15 am
Nonstop7h 40m
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Mon 11/23
5:00 pm-5:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Tue 12/1
2:35 pm-6:15 am
Nonstop7h 40m
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Mon 11/23
5:00 pm-5:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Tue 12/1
2:35 pm-6:15 am
Nonstop7h 40m
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Mon 11/23
5:00 pm-5:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Tue 12/1
2:35 pm-6:15 am
Nonstop7h 40m
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Mon 11/23
5:00 pm-5:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Tue 12/1
2:35 pm-6:15 am
Nonstop7h 40m
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Mon 11/23
5:00 pm-5:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Tue 12/1
2:35 pm-6:15 am
Nonstop7h 40m
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Fri 11/20
5:00 pm-5:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Fri 11/27
2:35 pm-6:15 am
Nonstop7h 40m
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Thu 11/19
5:00 pm-5:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Fri 4/30
7:00 pm-9:25 am
Nonstop7h 25m
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Mon 11/23
5:00 pm-5:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Mon 11/30
2:35 pm-6:15 am
Nonstop7h 40m
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Thu 11/19
5:00 pm-5:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Thu 5/6
3:40 pm-6:15 am
Nonstop7h 35m
See travel insights to Seattle from
How to get the cheapest flight ticket from Reykjavik Keflavik Intl Airport to Seattle
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest day to depart on your flight to Seattle?
On average, the least expensive day to fly to Seattle from Reykjavik Keflavik Intl Airport is on a Friday. momondo users have found tickets for Friday departures for as low as $732. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Tuesday is the most expensive day to depart from Reykjavik Keflavik Intl Airport because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $991.
What is the cheapest time of day to depart on your flight to Seattle?
Flying to Seattle from Reykjavik Keflavik Intl Airport in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $903 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the morning, with an average ticket price of $933. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.
What is the cheapest Reykjavik Keflavik Intl to Seattle/Tacoma Intl flight route?
Fly from Reykjavik Keflavik Intl to Seattle/Tacoma Intl for the best Reykjavik Keflavik Intl - Seattle/Tacoma Intl flight prices
What cabin class options are available on Reykjavik Keflavik Intl Airport to Seattle flights?
There are 2 cabin classes available to choose from on Reykjavik Keflavik Intl Airport to Seattle flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
Can stopping save me money on Reykjavik Keflavik Intl Airport to Seattle flights?
You could potentially save up to 30% on your flight if you consider stops on a Reykjavik Keflavik Intl Airport to Seattle flight.
How have Reykjavik Keflavik Intl Airport to Seattle flight prices changed over time?
How many flights depart from Reykjavik Keflavik Intl Airport to Seattle on average per day?
As of October 2026, 3 flights take off from Reykjavik Keflavik Intl Airport and land in Seattle each day. The most common flight departure time for this route is 4:00PM, with 56% of daily flights taking off in the afternoon.
How many flights depart from Reykjavik Keflavik Intl Airport to Seattle on average per week?
23 flights are operational weekly from Reykjavik Keflavik Intl Airport to Seattle as of October 2026. The most popular departure day for this route is Tue, with 17% of flights per week taking off on this day.
When to book flights from Reykjavik Keflavik Intl Airport to Seattle
Cheap Reykjavik Keflavik Intl Airport to Seattle (KEF to SEA) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Reykjavik Keflavik Intl Airport to Seattle
Frequently asked questions about flying from Reykjavik Keflavik Intl Airport to Seattle
How far is Reykjavik Keflavik Intl to Seattle/Tacoma Intl by plane?
The distance between Reykjavik Keflavik Intl and Seattle/Tacoma Intl is about 3599.8 mi. Flights usually cover this in 8h 00m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Reykjavik Keflavik Intl Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Reykjavik Keflavik Intl Airport to Seattle/Tacoma Intl Airport are refreshed on a daily basis.
How old do you have to be to fly from Reykjavik Keflavik Intl Airport to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Reykjavik Keflavik Intl Airport to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Reykjavik Keflavik Intl Airport to Seattle?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Reykjavik Keflavik Intl Airport to Seattle is Boeing 737 MAX 8 (75.00% of total bookings). The next most popular plane model is Airbus A321neo (25.00%).
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Reykjavik to Seattle?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Reykjavik to Seattle. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from Reykjavik to Seattle with flexible booking policies on momondo?
Yes. All flights to Seattle from Reykjavik on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from Reykjavik to Seattle?
Once you have performed a search for Reykjavik to Seattle flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.
I’m not ready to book a flight from Reykjavik to Seattle right now. Can momondo alert me if prices change?
Price alerts on flights to Seattle from Reykjavik are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.