What is the cheapest airline that flies from Basel to Seattle/Tacoma Intl?

British Airways is the most popular carrier operating from Basel to Seattle/Tacoma Intl

When did momondo last update prices for flights from Basel to Seattle/Tacoma Intl Airport?

Prices for flights from Basel to Seattle/Tacoma Intl Airport refresh daily.

How old do you have to be to fly from Basel to Seattle/Tacoma Intl Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Basel to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The required travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$508 Cheap Flights from Basel to Seattle in 2026/27

Find the cheapest flights from Basel to Seattle

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:10 am - 11:35 amBSL Basel EuroAirport Swiss-SEA Seattle/Tacoma Intl

14h 25m1 stop London Heathrow

7:45 pm - 8:00 pmSEA Seattle/Tacoma Intl-BSL Basel EuroAirport Swiss

16h 15m1 stop London Heathrow

$685British Airways

Thu, Oct 22 - Tue, Oct 27

8:35 pm - 11:25 amBSL Basel EuroAirport Swiss-SEA Seattle/Tacoma Intl

23h 50m1 stop London Heathrow

2:37 pm - 8:10 pmSEA Seattle/Tacoma Intl-BSL Basel EuroAirport Swiss

20h 33m2 stops Chicago O'Hare Intl London Heathrow

$709British Airways

Fri, Jan 22 - Sat, Jan 30

11:05 am - 12:44 amBSL Basel EuroAirport Swiss-SEA Seattle/Tacoma Intl

22h 39m2 stops London Heathrow Chicago O'Hare Intl

2:37 pm - 8:10 pmSEA Seattle/Tacoma Intl-BSL Basel EuroAirport Swiss

20h 33m2 stops Chicago O'Hare Intl London Heathrow

$715British Airways

Fri, Jan 22 - Sat, Jan 30

6:40 am - 4:48 pmBSL Basel EuroAirport Swiss-SEA Seattle/Tacoma Intl

19h 08m2 stops London Heathrow Dallas/Fort Worth

8:24 am - 11:15 amSEA Seattle/Tacoma Intl-BSL Basel EuroAirport Swiss

17h 51m2 stops Philadelphia London Heathrow

$718American Airlines

Wed, Oct 7 - Wed, Oct 21

6:10 am - 11:35 amBSL Basel EuroAirport Swiss-SEA Seattle/Tacoma Intl

14h 25m1 stop London Heathrow

10:31 am - 8:00 pmSEA Seattle/Tacoma Intl-BSL Basel EuroAirport Swiss

25h 29m2 stops Chicago O'Hare Intl London Heathrow

$730Multiple Airlines

Thu, Oct 22 - Tue, Oct 27

8:40 pm - 4:50 pmBSL Basel EuroAirport Swiss-SEA Seattle/Tacoma Intl

29h 10m1 stop London Heathrow

6:45 pm - 10:00 amSEA Seattle/Tacoma Intl-BSL Basel EuroAirport Swiss

30h 15m1 stop London Heathrow

$733British Airways

Thu, Jan 14 - Sun, Jan 17

6:10 am - 11:35 amBSL Basel EuroAirport Swiss-SEA Seattle/Tacoma Intl

14h 25m1 stop London Heathrow

6:12 am - 6:20 pmSEA Seattle/Tacoma Intl-BSL Basel EuroAirport Swiss

27h 08m2 stops Chicago O'Hare Intl London Heathrow

$734Multiple Airlines

Thu, Oct 15 - Mon, Oct 19

8:40 pm - 4:50 pmBSL Basel EuroAirport Swiss-SEA Seattle/Tacoma Intl

29h 10m1 stop London Heathrow

6:45 pm - 10:00 amSEA Seattle/Tacoma Intl-BSL Basel EuroAirport Swiss

30h 15m1 stop London Heathrow

$735British Airways

Thu, Jan 14 - Sun, Jan 17

6:40 am - 12:36 amBSL Basel EuroAirport Swiss-SEA Seattle/Tacoma Intl

26h 56m2 stops London Heathrow Chicago O'Hare Intl

8:24 am - 11:15 amSEA Seattle/Tacoma Intl-BSL Basel EuroAirport Swiss

17h 51m2 stops Philadelphia London Heathrow

$738American Airlines

Mon, Oct 5 - Wed, Oct 21

11:05 am - 12:44 amBSL Basel EuroAirport Swiss-SEA Seattle/Tacoma Intl

22h 39m2 stops London Heathrow Chicago O'Hare Intl

2:37 pm - 6:45 pmSEA Seattle/Tacoma Intl-BSL Basel EuroAirport Swiss

43h 08m2 stops Chicago O'Hare Intl London Heathrow

$739American Airlines

Thu, Jan 14 - Sun, Jan 17

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KLM flights from Basel to Seattle

Our best KLM deals on Basel to Seattle flight tickets

KLM

Oct 7

BSL10:15 amBasel EuroAirport Swiss

15h 20m

1 stop

SEA4:35 pmSeattle/Tacoma Intl

Oct 20

SEA1:30 pmSeattle/Tacoma Intl

15h 15m

1 stop

BSL1:45 pmBasel EuroAirport Swiss

$778

KLM

Oct 6

BSL6:30 amBasel EuroAirport Swiss

14h 22m

1 stop

SEA11:52 amSeattle/Tacoma Intl

Oct 22

SEA5:45 pmSeattle/Tacoma Intl

19h 05m

1 stop

BSL9:50 pmBasel EuroAirport Swiss

$784

KLM

Oct 12

BSL6:30 pmBasel EuroAirport Swiss

31h 15m

2 stops

SEA4:45 pmSeattle/Tacoma Intl

Oct 19

SEA9:45 amSeattle/Tacoma Intl

19h 05m

2 stops

BSL1:50 pmBasel EuroAirport Swiss

$797

Delta flights from Basel to Seattle

Our best Delta deals on Basel to Seattle flight tickets

Delta

Oct 6

BSL6:30 amBasel EuroAirport Swiss

19h 05m

1 stop

SEA4:35 pmSeattle/Tacoma Intl

Oct 20

SEA1:30 pmSeattle/Tacoma Intl

15h 15m

1 stop

BSL1:45 pmBasel EuroAirport Swiss

$756

Delta

Oct 22

BSL6:30 amBasel EuroAirport Swiss

21h 05m

2 stops

SEA6:35 pmSeattle/Tacoma Intl

Oct 27

SEA7:24 amSeattle/Tacoma Intl

18h 36m

2 stops

BSL10:00 amBasel EuroAirport Swiss

$759

Delta

Oct 8

BSL6:30 amBasel EuroAirport Swiss

14h 22m

1 stop

SEA11:52 amSeattle/Tacoma Intl

Oct 22

SEA5:45 pmSeattle/Tacoma Intl

15h 10m

1 stop

BSL5:55 pmBasel EuroAirport Swiss

$762

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

BaselSeattle

BSL Basel EuroAirport Swiss - SEA Seattle/Tacoma Intl

BSLSEA

Basel EuroAirport Swiss

Thu 10/22

6:10 am-11:35 am

1 stop14h 25m

Seattle/Tacoma Intl

Tue 10/27

7:45 pm-8:00 pm

1 stop16h 15m

$685

BaselSeattle

BSL Basel EuroAirport Swiss - SEA Seattle/Tacoma Intl

BSLSEA

Basel EuroAirport Swiss

Fri 1/22

8:35 pm-11:25 am

1 stop23h 50m

Seattle/Tacoma Intl

Sat 1/30

2:37 pm-8:10 pm

2 stops20h 33m

$709

BaselSeattle

BSL Basel EuroAirport Swiss - SEA Seattle/Tacoma Intl

BSLSEA

Basel EuroAirport Swiss

Fri 1/22

11:05 am-12:44 am

2 stops22h 39m

Seattle/Tacoma Intl

Sat 1/30

2:37 pm-8:10 pm

2 stops20h 33m

$715

BaselSeattle

BSL Basel EuroAirport Swiss - SEA Seattle/Tacoma Intl

BSLSEA

Basel EuroAirport Swiss

Wed 10/7

6:40 am-4:48 pm

2 stops19h 08m

Seattle/Tacoma Intl

Wed 10/21

8:24 am-11:15 am

2 stops17h 51m

$718

BaselSeattle

BSL Basel EuroAirport Swiss - SEA Seattle/Tacoma Intl

BSLSEA

Basel EuroAirport Swiss

Thu 10/22

6:10 am-11:35 am

1 stop14h 25m

Seattle/Tacoma Intl

Tue 10/27

10:31 am-8:00 pm

2 stops25h 29m

$730

BaselSeattle

BSL Basel EuroAirport Swiss - SEA Seattle/Tacoma Intl

BSLSEA

Basel EuroAirport Swiss

Thu 1/14

8:40 pm-4:50 pm

1 stop29h 10m

Seattle/Tacoma Intl

Sun 1/17

6:45 pm-10:00 am

1 stop30h 15m

$733

BaselSeattle

BSL Basel EuroAirport Swiss - SEA Seattle/Tacoma Intl

BSLSEA

Basel EuroAirport Swiss

Thu 10/15

6:10 am-11:35 am

1 stop14h 25m

Seattle/Tacoma Intl

Mon 10/19

6:12 am-6:20 pm

2 stops27h 08m

$734

BaselSeattle

BSL Basel EuroAirport Swiss - SEA Seattle/Tacoma Intl

BSLSEA

Basel EuroAirport Swiss

Thu 1/14

8:40 pm-4:50 pm

1 stop29h 10m

Seattle/Tacoma Intl

Sun 1/17

6:45 pm-10:00 am

1 stop30h 15m

$735

BaselSeattle

BSL Basel EuroAirport Swiss - SEA Seattle/Tacoma Intl

BSLSEA

Basel EuroAirport Swiss

Mon 10/5

6:40 am-12:36 am

2 stops26h 56m

Seattle/Tacoma Intl

Wed 10/21

8:24 am-11:15 am

2 stops17h 51m

$738

BaselSeattle

BSL Basel EuroAirport Swiss - SEA Seattle/Tacoma Intl

BSLSEA

Basel EuroAirport Swiss

Thu 1/14

11:05 am-12:44 am

2 stops22h 39m

Seattle/Tacoma Intl

Sun 1/17

2:37 pm-6:45 pm

2 stops43h 08m

$739

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Basel 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

Prices

Airlines

What is the typical price of a round-trip flight between Basel and Seattle?

Prices are currently high for flights on this route.

Typical prices usually range from $614 to $649.
The lowest price recently found on this route was $685.

What is the cheapest month to fly to Seattle?

In general, March is the cheapest month to fly from Basel to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $0. If you don’t want to visit Seattle in March, then you should wait until January to fly from Basel, when ticket prices are also cheap, with an average price of $0.

When to book flights from Basel to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Basel to Seattle according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Basel to Seattle (EAP to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Basel to Seattle

Best Price Found	$508
Fastest flight time	14h 25m
Direct flights	None

The best one-way flight to Seattle from Basel in the past 72 hours is $508. The best round-trip flight deal from Basel to Seattle found on momondo in the last 72 hours is $685.

The fastest flight from Basel to Seattle takes 14h 25m

There are no direct flights from Basel to Seattle. There are no popular flight routes from Basel to Seattle.

Search flight deals

Frequently asked questions about flying from Basel to Seattle

How far is Basel to Seattle/Tacoma Intl by plane?
A flight from Basel to Seattle/Tacoma Intl will travel around 5202.0 mi. A reasonable flight in good conditions will take 14h 25m.
When did momondo last update prices for flights from Basel to Seattle/Tacoma Intl Airport?
Prices for flights from Basel to Seattle/Tacoma Intl Airport refresh daily.
How old do you have to be to fly from Basel to Seattle/Tacoma Intl Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Basel to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The required travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Kent

Olympia

Redmond

Lakewood

Federal Way

Fife

Puyallup

Tukwila

Lynnwood

Cle Elum

Marysville

Lacey

Kirkland

Centralia

Shoreline

Why use momondo?

Why should I use momondo to find a flight deal from Basel to Seattle?

Finding the right flight to Seattle from Basel is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Seattle quick and easy, saving you time and money.

Can I find flights from Basel to Seattle with flexible booking policies on momondo?

momondo does allow users to show only those flights to Seattle from Basel which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Basel to Seattle?

Once you have performed a search for Basel 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 Basel to Seattle right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Basel to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.