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.

$434 Cheap Flights from Basel to Seattle in 2026

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

Prices are currently low for flights on this route. Typical prices usually range from $684 to $639. The lowest price recently found on this route was $682.

Find the cheapest flights from Basel to Seattle

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:20 pm - 11:35 am

BSL

SEA

24h 15m

1 stop

1:35 pm - 3:35 pm

SEA

BSL

17h 00m

1 stop

$682British Airways

Thu, Aug 27 - Sat, Nov 14

6:10 am - 11:35 am

BSL

SEA

14h 25m

1 stop

8:20 pm - 6:30 pm

SEA

BSL

13h 10m

1 stop

$696British Airways

Thu, Aug 20 - Thu, Sep 10

6:10 am - 11:35 pm

BSL

SEA

26h 25m

2 stops

1:38 pm - 6:20 pm

SEA

BSL

19h 42m

2 stops

$700American Airlines

Thu, Aug 20 - Mon, Sep 14

6:40 am - 8:52 pm

BSL

SEA

23h 12m

2 stops

1:30 pm - 10:50 pm

SEA

BSL

24h 20m

1 stop

$702British Airways

Wed, Aug 26 - Sun, Sep 13

6:10 am - 11:35 pm

BSL

SEA

26h 25m

2 stops

3:42 pm - 10:50 pm

SEA

BSL

22h 08m

2 stops

$703American Airlines

Thu, Aug 20 - Fri, Sep 11

6:10 am - 8:52 pm

BSL

SEA

23h 42m

2 stops

10:35 am - 3:35 pm

SEA

BSL

20h 00m

2 stops

$705Multiple Airlines

Thu, Aug 27 - Sat, Nov 14

7:15 am - 6:47 pm

BSL

SEA

20h 32m

2 stops

3:42 pm - 6:50 pm

SEA

BSL

18h 08m

2 stops

$735American Airlines

Sun, Aug 23 - Sun, Sep 13

6:10 am - 8:52 pm

BSL

SEA

23h 42m

2 stops

1:38 pm - 6:50 pm

SEA

BSL

20h 12m

2 stops

$739American Airlines

Thu, Aug 20 - Sun, Sep 13

2:20 pm - 11:37 am

BSL

SEA

30h 17m

1 stop

1:30 pm - 1:45 pm

SEA

BSL

15h 15m

1 stop

$743Air France

Fri, Aug 21 - Sun, Sep 13

6:30 am - 4:27 pm

BSL

SEA

18h 57m

1 stop

6:45 pm - 9:55 am

SEA

BSL

30h 10m

1 stop

$745Air France

Thu, Aug 20 - Fri, Sep 11

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United Airlines flights from Basel to Seattle

Our best United Airlines deals on Basel to Seattle flight tickets

United Airlines

Aug 27

BSL10:35 amBasel EuroAirport Swiss

21h 51m

3 stops

SEA11:26 pmSeattle/Tacoma Intl

Nov 14

SEA11:00 amSeattle/Tacoma Intl

16h 30m

2 stops

BSL12:30 pmBasel EuroAirport Swiss

$790

United Airlines

Aug 6

BSL6:00 amBasel EuroAirport Swiss

14h 55m

1 stop

SEA11:55 amSeattle/Tacoma Intl

Aug 11

SEA12:44 pmSeattle/Tacoma Intl

16h 21m

2 stops

BSL2:05 pmBasel EuroAirport Swiss

$795

United Airlines

Jul 2

BSL9:55 amBasel EuroAirport Swiss

31h 05m

2 stops

SEA8:00 amSeattle/Tacoma Intl

Sep 10

SEA5:00 amSeattle/Tacoma Intl

22h 25m

2 stops

BSL12:25 pmBasel EuroAirport Swiss

$802

British Airways flights from Basel to Seattle

Our best British Airways deals on Basel to Seattle flight tickets

British Airways

Aug 27

BSL8:20 pmBasel EuroAirport Swiss

24h 15m

1 stop

SEA11:35 amSeattle/Tacoma Intl

Nov 14

SEA1:35 pmSeattle/Tacoma Intl

17h 00m

1 stop

BSL3:35 pmBasel EuroAirport Swiss

$682

British Airways

Aug 20

BSL6:10 amBasel EuroAirport Swiss

14h 25m

1 stop

SEA11:35 amSeattle/Tacoma Intl

Sep 10

SEA8:20 pmSeattle/Tacoma Intl

13h 10m

1 stop

BSL6:30 pmBasel EuroAirport Swiss

$696

British Airways

Aug 26

BSL6:40 amBasel EuroAirport Swiss

23h 12m

2 stops

SEA8:52 pmSeattle/Tacoma Intl

Sep 13

SEA1:30 pmSeattle/Tacoma Intl

24h 20m

1 stop

BSL10:50 pmBasel EuroAirport Swiss

$702

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 8/27

8:20 pm-11:35 am

1 stop24h 15m

Seattle/Tacoma Intl

Sat 11/14

1:35 pm-3:35 pm

1 stop17h 00m

$682

Quickest round-trip

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 8/20

6:10 am-11:35 am

1 stop14h 25m

Seattle/Tacoma Intl

Thu 9/10

8:20 pm-6:30 pm

1 stop13h 10m

$696

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 8/20

6:10 am-11:35 pm

2 stops26h 25m

Seattle/Tacoma Intl

Mon 9/14

1:38 pm-6:20 pm

2 stops19h 42m

$700

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Wed 8/26

6:40 am-8:52 pm

2 stops23h 12m

Seattle/Tacoma Intl

Sun 9/13

1:30 pm-10:50 pm

1 stop24h 20m

$702

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 8/20

6:10 am-11:35 pm

2 stops26h 25m

Seattle/Tacoma Intl

Fri 9/11

3:42 pm-10:50 pm

2 stops22h 08m

$703

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 8/27

6:10 am-8:52 pm

2 stops23h 42m

Seattle/Tacoma Intl

Sat 11/14

10:35 am-3:35 pm

2 stops20h 00m

$705

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Sun 8/23

7:15 am-6:47 pm

2 stops20h 32m

Seattle/Tacoma Intl

Sun 9/13

3:42 pm-6:50 pm

2 stops18h 08m

$735

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 8/20

6:10 am-8:52 pm

2 stops23h 42m

Seattle/Tacoma Intl

Sun 9/13

1:38 pm-6:50 pm

2 stops20h 12m

$739

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Fri 8/21

2:20 pm-11:37 am

1 stop30h 17m

Seattle/Tacoma Intl

Sun 9/13

1:30 pm-1:45 pm

1 stop15h 15m

$743

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

Thu 8/20

6:30 am-4:27 pm

1 stop18h 57m

Seattle/Tacoma Intl

Fri 9/11

6:45 pm-9:55 am

1 stop30h 10m

$745

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?

What is the cheapest month to fly to Seattle?

In general, October 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 $521. If you don’t want to visit Seattle in October, then you should wait until September to fly from Basel, when ticket prices are also cheap, with an average price of $527.

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

Fastest flight time	14h 55m
Direct flights	None

The fastest flight from Basel to Seattle takes 14h 55m

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 55m.
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

Olympia

Lynnwood

Redmond

Kent

Lakewood

Puyallup

Tukwila

Federal Way

Fife

Cle Elum

Marysville

Centralia

Shoreline

Kirkland

Westport

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.