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Cheap flights from Seattle to Basel from $394

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 9/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Seattle to Basel

Cheap round-trip flights

British Airways Logo
6:50 pm - 10:05 pmSEA-BSL
18h 15m1 stop
British Airways Logo
7:00 am - 11:30 amBSL-SEA
13h 30m1 stop
$482British Airways
Find Deal
Wed, Dec 24 - Tue, Dec 30
British Airways Logo
7:45 am - 10:55 amSEA-BSL
18h 10m2 stops
British Airways Logo
6:40 am - 11:35 amBSL-SEA
13h 55m1 stop
$486British Airways
Find Deal
Tue, Sep 9 - Wed, Sep 24
American Airlines Logo
7:44 am - 10:55 amSEA-BSL
18h 11m2 stops
American Airlines Logo
6:00 am - 5:29 pmBSL-SEA
20h 29m2 stops
$494American Airlines
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Tue, Aug 26 - Fri, Sep 12
British Airways Logo
7:45 am - 10:55 amSEA-BSL
18h 10m2 stops
British Airways Logo
6:40 am - 5:29 pmBSL-SEA
19h 49m2 stops
$496British Airways
Find Deal
Tue, Sep 9 - Wed, Sep 24
Logo
6:45 pm - 9:30 amSEA-BSL
29h 45m1 stop
Logo
10:10 am - 4:05 pmBSL-SEA
14h 55m1 stop
$500
Find Deal
Sun, Sep 7 - Wed, Sep 24
Delta Logo
5:40 pm - 5:50 pmSEA-BSL
15h 10m1 stop
Delta Logo
10:10 am - 5:40 pmBSL-SEA
16h 30m1 stop
$510Delta
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Tue, Sep 9 - Wed, Sep 24
KLM Logo
1:55 pm - 5:50 pmSEA-BSL
18h 55m1 stop
KLM Logo
10:10 am - 4:05 pmBSL-SEA
14h 55m1 stop
$511KLM
Find Deal
Tue, Aug 26 - Fri, Sep 12
KLM Logo
1:55 pm - 9:40 pmSEA-BSL
22h 45m1 stop
KLM Logo
6:15 am - 11:45 amBSL-SEA
14h 30m1 stop
$512KLM
Find Deal
Tue, Aug 26 - Fri, Sep 12
Delta Logo
1:55 pm - 9:50 amSEA-BSL
34h 55m1 stop
Delta Logo
11:15 am - 11:50 amBSL-SEA
33h 35m1 stop
$520Delta
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Wed, Nov 19 - Sun, Nov 23
Logo
2:55 pm - 7:35 pmSEA-BSL
19h 40m2 stops
Logo
6:05 am - 11:55 amBSL-SEA
14h 50m1 stop
$521
Find Deal
Tue, Aug 26 - Fri, Sep 12

United Airlines flights from Seattle to Basel EuroAirport Swiss

Our best United Airlines deals on Seattle to Basel EuroAirport Swiss flight tickets
United Airlines
Aug 17
SEA2:20 pmSeattle/Tacoma Intl
11h 35m
1 stop
BSL10:55 amBasel EuroAirport Swiss
Aug 25
BSL1:00 pmBasel EuroAirport Swiss
38h 49m
2 stops
SEA6:49 pmSeattle/Tacoma Intl
$537
Find similar
United Airlines
Aug 26
SEA7:00 amSeattle/Tacoma Intl
20h 25m
2 stops
BSL12:25 pmBasel EuroAirport Swiss
Sep 2
BSL11:25 amBasel EuroAirport Swiss
41h 06m
2 stops
SEA7:31 pmSeattle/Tacoma Intl
$538
Find similar
United Airlines
Aug 26
SEA7:10 amSeattle/Tacoma Intl
20h 15m
3 stops
BSL12:25 pmBasel EuroAirport Swiss
Sep 12
BSL11:30 amBasel EuroAirport Swiss
37h 49m
2 stops
SEA4:19 pmSeattle/Tacoma Intl
$553
Find similar

Lufthansa flights from Seattle to Basel EuroAirport Swiss

Our best Lufthansa deals on Seattle to Basel EuroAirport Swiss flight tickets
Lufthansa
Sep 7
SEA2:20 pmSeattle/Tacoma Intl
11h 35m
1 stop
BSL10:55 amBasel EuroAirport Swiss
Sep 24
BSL6:05 amBasel EuroAirport Swiss
17h 11m
2 stops
SEA2:16 pmSeattle/Tacoma Intl
$535
Find similar
Lufthansa
Dec 8
SEA2:00 pmSeattle/Tacoma Intl
17h 00m
2 stops
BSL4:00 pmBasel EuroAirport Swiss
Dec 26
BSL9:45 amBasel EuroAirport Swiss
12h 35m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$568
Find similar
Lufthansa
Aug 10
SEA6:50 pmSeattle/Tacoma Intl
15h 45m
1 stop
BSL7:35 pmBasel EuroAirport Swiss
Aug 23
BSL8:25 amBasel EuroAirport Swiss
12h 30m
1 stop
SEA11:55 amSeattle/Tacoma Intl
$3,981
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Basel EuroAirport Swiss 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 31, 2025.
Use the filters below to find and compare flights from Seattle to Basel EuroAirport Swiss that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 12/24

6:50 pm-10:05 pm

1 stop18h 15m

Basel EuroAirport Swiss

Tue 12/30

7:00 am-11:30 am

1 stop13h 30m

$482

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 9/9

7:45 am-10:55 am

2 stops18h 10m

Basel EuroAirport Swiss

Wed 9/24

6:40 am-11:35 am

1 stop13h 55m

$486

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 8/26

7:44 am-10:55 am

2 stops18h 11m

Basel EuroAirport Swiss

Fri 9/12

6:00 am-5:29 pm

2 stops20h 29m

$494

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 9/9

7:45 am-10:55 am

2 stops18h 10m

Basel EuroAirport Swiss

Wed 9/24

6:40 am-5:29 pm

2 stops19h 49m

$496

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 9/7

6:45 pm-9:30 am

1 stop29h 45m

Basel EuroAirport Swiss

Wed 9/24

10:10 am-4:05 pm

1 stop14h 55m

$500

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 9/9

5:40 pm-5:50 pm

1 stop15h 10m

Basel EuroAirport Swiss

Wed 9/24

10:10 am-5:40 pm

1 stop16h 30m

$510

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 8/26

1:55 pm-5:50 pm

1 stop18h 55m

Basel EuroAirport Swiss

Fri 9/12

10:10 am-4:05 pm

1 stop14h 55m

$511

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 8/26

1:55 pm-9:40 pm

1 stop22h 45m

Basel EuroAirport Swiss

Fri 9/12

6:15 am-11:45 am

1 stop14h 30m

$512

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 11/19

1:55 pm-9:50 am

1 stop34h 55m

Basel EuroAirport Swiss

Sun 11/23

11:15 am-11:50 am

1 stop33h 35m

$520

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 8/26

2:55 pm-7:35 pm

2 stops19h 40m

Basel EuroAirport Swiss

Fri 9/12

6:05 am-11:55 am

1 stop14h 50m

$521

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Basel from

How to get the cheapest flight ticket from Seattle to Basel EuroAirport Swiss

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 month to fly to Basel EuroAirport Swiss?

If you are unable to visit Basel EuroAirport Swiss during the month of August, then departing from Seattle during the month November is also very affordable. Most momondo users find prices during this month for around $474.

What is the cheapest day to depart on your flight to Basel EuroAirport Swiss?

According to our data, Wednesday is the cheapest day to fly to Basel EuroAirport Swiss from Seattle. The lowest ticket price found for a Wednesday departure recently was $590. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Seattle to Basel EuroAirport Swiss on a Friday will generally be more expensive and average around $1,201. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Basel EuroAirport Swiss?

According to our data, the cheapest time of day to fly to Basel EuroAirport Swiss is in the evening. momondo users have found flights departing from Seattle to Basel EuroAirport Swiss in the evening for as low as $590. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Try not to purchase tickets in the afternoon because they tend to be around $767. Of course, these prices can vary depending on the time of year and what airport you fly to.

Can stopping save me money on Seattle to Basel EuroAirport Swiss flights?

You could potentially save up to 57% on your flight if you consider stops on a Seattle to Basel EuroAirport Swiss flight.

When to book flights from Seattle to Basel EuroAirport Swiss

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

Cheap Seattle to Basel EuroAirport Swiss (SEA to BSL) flight deals and tips

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

Best Price Found

$394

Fastest flight time

11h 35m

Direct flights

None
The best one-way flight to Basel EuroAirport Swiss from Seattle in the past 72 hours is $394. The best round-trip flight deal from Seattle to Basel EuroAirport Swiss found on momondo in the last 72 hours is $482.
The fastest flight from Seattle to Basel EuroAirport Swiss takes 11h 35m
There are no direct flights from Seattle to Basel EuroAirport Swiss. Popular non-direct route for this connection is Seattle/Tacoma Intl Airport - Basel EuroAirport Swiss.
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  • How far is Seattle/Tacoma Intl to Basel EuroAirport Swiss by plane?

    Seattle/Tacoma Intl and Basel EuroAirport Swiss are 5198.6 mi apart from one another. A reasonable flight in good conditions will take 11h 35m.

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

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

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Basel EuroAirport Swiss?

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

    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 EuroAirport Swiss.

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

    The travel and health documents required for your trip to Basel EuroAirport Swiss 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 EuroAirport Swiss. 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 EuroAirport Swiss?

Best airlines flying from Seattle to Basel EuroAirport Swiss

Compare and see reviews for airlines that fly from Seattle to Basel EuroAirport Swiss with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $443Free CancellationRating
6.6
7,222 reviews
Search British Airways flights
DeltaPriceFrom $513Free CancellationRating
8.0
7,981 reviews
Search Delta flights

Why use momondo?

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

Finding the right flight to Basel from Seattle 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 Basel quick and easy, saving you time and money.

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

Flights from Seattle to Basel with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once all potential Seattle to Basel flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Seattle to Basel right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Basel, momondo offers a useful price alert feature which will track prices for flights to Basel from Seattle and alert you when they change.

An easier way to manage your Basel EuroAirport Swiss trip

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