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Cheap flights from Seattle to Basel from $338

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Basel departing on 9/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Seattle to Basel

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
2:10 pm - 2:05 pm
SEA
-
BSL
14h 55m
1 stop
United Airlines Logo
6:10 am - 2:22 pm
BSL
-
SEA
17h 12m
2 stops
$774United Airlines
Tue, Aug 18 - Wed, Aug 26
Multiple Airlines Logo
10:50 am - 10:25 am
SEA
-
BSL
14h 35m
2 stops
Multiple Airlines Logo
6:05 am - 2:22 pm
BSL
-
SEA
17h 17m
2 stops
$776Multiple Airlines
Mon, Sep 14 - Tue, Sep 22
United Airlines Logo
7:00 am - 2:05 pm
SEA
-
BSL
22h 05m
2 stops
United Airlines Logo
6:10 am - 2:22 pm
BSL
-
SEA
17h 12m
2 stops
$779United Airlines
Tue, Aug 18 - Wed, Aug 26
United Airlines Logo
7:30 am - 9:15 am
SEA
-
BSL
16h 45m
2 stops
United Airlines Logo
2:30 pm - 11:55 am
BSL
-
SEA
30h 25m
1 stop
$787United Airlines
Mon, Aug 24 - Mon, Aug 31
Lufthansa Logo
10:50 am - 2:00 pm
SEA
-
BSL
18h 10m
2 stops
Lufthansa Logo
6:10 am - 11:55 am
BSL
-
SEA
14h 45m
1 stop
$791Lufthansa
Mon, Sep 14 - Wed, Sep 30
Lufthansa Logo
2:10 pm - 2:00 pm
SEA
-
BSL
14h 50m
1 stop
Lufthansa Logo
6:10 am - 11:55 am
BSL
-
SEA
14h 45m
1 stop
$792Lufthansa
Mon, Sep 14 - Wed, Sep 30
Lufthansa Logo
2:10 pm - 2:00 pm
SEA
-
BSL
14h 50m
1 stop
Lufthansa Logo
6:10 am - 11:55 am
BSL
-
SEA
14h 45m
1 stop
$793Lufthansa
Mon, Sep 14 - Wed, Sep 30
Lufthansa Logo
2:10 pm - 2:00 pm
SEA
-
BSL
14h 50m
1 stop
Lufthansa Logo
6:05 am - 11:55 am
BSL
-
SEA
14h 50m
1 stop
$794Lufthansa
Mon, Sep 14 - Tue, Sep 22
Multiple Airlines Logo
10:50 am - 10:25 am
SEA
-
BSL
14h 35m
2 stops
Multiple Airlines Logo
11:10 am - 6:32 pm
BSL
-
SEA
16h 22m
2 stops
$795Multiple Airlines
Mon, Sep 14 - Wed, Sep 30
Lufthansa Logo
2:10 pm - 2:00 pm
SEA
-
BSL
14h 50m
1 stop
Lufthansa Logo
2:30 pm - 11:55 am
BSL
-
SEA
30h 25m
1 stop
$816Lufthansa
Mon, Aug 24 - Mon, Aug 31

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Turkish Airlines flights from Seattle to Basel

Our best Turkish Airlines deals on Seattle to Basel flight tickets
Turkish Airlines
Sep 5
SEA12:35 pmSeattle/Tacoma Intl
20h 40m
1 stop
BSL6:15 pmBasel EuroAirport Swiss
Sep 11
BSL10:40 amBasel EuroAirport Swiss
33h 00m
1 stop
SEA10:40 amSeattle/Tacoma Intl
$923
Turkish Airlines
Sep 6
SEA7:15 pmSeattle/Tacoma Intl
29h 30m
1 stop
BSL9:45 amBasel EuroAirport Swiss
Sep 10
BSL7:10 pmBasel EuroAirport Swiss
31h 10m
1 stop
SEA5:20 pmSeattle/Tacoma Intl
$1,153
Turkish Airlines
Sep 6
SEA7:15 pmSeattle/Tacoma Intl
29h 30m
1 stop
BSL9:45 amBasel EuroAirport Swiss
Sep 10
BSL7:10 pmBasel EuroAirport Swiss
31h 10m
1 stop
SEA5:20 pmSeattle/Tacoma Intl
$1,228

United Airlines flights from Seattle to Basel

Our best United Airlines deals on Seattle to Basel flight tickets
United Airlines
Aug 24
SEA7:30 amSeattle/Tacoma Intl
16h 45m
2 stops
BSL9:15 amBasel EuroAirport Swiss
Aug 31
BSL2:30 pmBasel EuroAirport Swiss
30h 25m
1 stop
SEA11:55 amSeattle/Tacoma Intl
$787
United Airlines
Aug 21
SEA7:00 amSeattle/Tacoma Intl
22h 15m
2 stops
BSL2:15 pmBasel EuroAirport Swiss
Aug 28
BSL11:10 amBasel EuroAirport Swiss
21h 16m
3 stops
SEA11:26 pmSeattle/Tacoma Intl
$892
United Airlines
Aug 21
SEA8:10 amSeattle/Tacoma Intl
21h 05m
2 stops
BSL2:15 pmBasel EuroAirport Swiss
Aug 27
BSL2:50 pmBasel EuroAirport Swiss
30h 05m
1 stop
SEA11:55 amSeattle/Tacoma Intl
$902

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Basel 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, momondo users made 832,500 searches. Data last updated July 11, 2026.
Use the filters below to find and compare flights from Seattle to Basel that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 8/18

2:10 pm-2:05 pm

1 stop14h 55m

Basel EuroAirport Swiss

Wed 8/26

6:10 am-2:22 pm

2 stops17h 12m

$774

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 9/14

10:50 am-10:25 am

2 stops14h 35m

Basel EuroAirport Swiss

Tue 9/22

6:05 am-2:22 pm

2 stops17h 17m

$776

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 8/18

7:00 am-2:05 pm

2 stops22h 05m

Basel EuroAirport Swiss

Wed 8/26

6:10 am-2:22 pm

2 stops17h 12m

$779

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 8/24

7:30 am-9:15 am

2 stops16h 45m

Basel EuroAirport Swiss

Mon 8/31

2:30 pm-11:55 am

1 stop30h 25m

$787

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 9/14

10:50 am-2:00 pm

2 stops18h 10m

Basel EuroAirport Swiss

Wed 9/30

6:10 am-11:55 am

1 stop14h 45m

$791
Quickest round-trip

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 9/14

2:10 pm-2:00 pm

1 stop14h 50m

Basel EuroAirport Swiss

Wed 9/30

6:10 am-11:55 am

1 stop14h 45m

$792

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 9/14

2:10 pm-2:00 pm

1 stop14h 50m

Basel EuroAirport Swiss

Wed 9/30

6:10 am-11:55 am

1 stop14h 45m

$793

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 9/14

2:10 pm-2:00 pm

1 stop14h 50m

Basel EuroAirport Swiss

Tue 9/22

6:05 am-11:55 am

1 stop14h 50m

$794

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 9/14

10:50 am-10:25 am

2 stops14h 35m

Basel EuroAirport Swiss

Wed 9/30

11:10 am-6:32 pm

2 stops16h 22m

$795

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 8/24

2:10 pm-2:00 pm

1 stop14h 50m

Basel EuroAirport Swiss

Mon 8/31

2:30 pm-11:55 am

1 stop30h 25m

$816

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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2

See travel insights to Basel from

How to get the cheapest flight ticket from Seattle to Basel

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 airline that flies from Seattle/Tacoma Intl to Basel?

KLM, Delta, and United Airlines are the most popular carriers operating from Seattle/Tacoma Intl to Basel

When to book flights from Seattle to Basel

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

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

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

Fastest flight time

15h 05m

Direct flights

None
The fastest flight from Seattle to Basel takes 15h 05m
There are no direct flights from Seattle to Basel. There are no popular flight routes from Seattle to Basel.
Search flight deals

Frequently asked questions about flying from Seattle to Basel

  • How far is Seattle/Tacoma Intl to Basel by plane?

    A flight from Seattle/Tacoma Intl to Basel will travel around 5202.0 mi. Typically, this will take 15h 05m by plane in normal conditions.

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

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to Basel.

  • What documentation or ID do you need to fly to Basel?

    The travel and health documents required for your trip to Basel 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 Basel. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Seattle to Basel?

Why use momondo?

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

It is quick and easy to find Seattle to Basel flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Basel that suits you.

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

Yes. All flights to Basel from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

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

Price alerts on flights to Basel from Seattle 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.

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