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Cheap flights from Seattle to Basel from $763

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Basel departing on 8/18. 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
6:50 pm - 7:35 pm
SEA
-
BSL
15h 45m
1 stop
United Airlines Logo
6:00 am - 11:55 am
BSL
-
SEA
14h 55m
1 stop
$763United Airlines
Tue, Aug 18 - Thu, Aug 27
United Airlines Logo
12:44 pm - 7:35 pm
SEA
-
BSL
21h 51m
2 stops
United Airlines Logo
6:10 am - 11:55 am
BSL
-
SEA
14h 45m
1 stop
$768United Airlines
Mon, Aug 17 - Wed, Aug 26
United Airlines Logo
3:54 pm - 7:35 pm
SEA
-
BSL
18h 41m
2 stops
United Airlines Logo
9:55 am - 9:07 pm
BSL
-
SEA
20h 12m
2 stops
$777United Airlines
Mon, Aug 17 - Wed, Aug 26
United Airlines Logo
5:20 pm - 7:35 pm
SEA
-
BSL
17h 15m
2 stops
United Airlines Logo
6:10 am - 4:07 pm
BSL
-
SEA
18h 57m
2 stops
$778United Airlines
Mon, Aug 17 - Wed, Aug 26
British Airways Logo
1:30 pm - 11:00 am
SEA
-
BSL
12h 30m
1 stop
British Airways Logo
11:50 am - 6:25 pm
BSL
-
SEA
15h 35m
1 stop
$843British Airways
Mon, Aug 17 - Wed, Aug 26
Lufthansa Logo
6:50 pm - 7:35 pm
SEA
-
BSL
15h 45m
1 stop
Lufthansa Logo
8:15 pm - 4:59 pm
BSL
-
SEA
29h 44m
1 stop
$880Lufthansa
Tue, Jul 14 - Mon, Jul 20
British Airways Logo
8:20 pm - 10:50 pm
SEA
-
BSL
17h 30m
1 stop
British Airways Logo
7:10 pm - 11:35 am
BSL
-
SEA
25h 25m
1 stop
$883British Airways
Tue, Jul 14 - Tue, Jul 21
Lufthansa Logo
8:10 am - 10:25 am
SEA
-
BSL
41h 15m
2 stops
Lufthansa Logo
9:50 am - 4:59 pm
BSL
-
SEA
16h 09m
1 stop
$886Lufthansa
Fri, Sep 4 - Fri, Sep 18
Multiple Airlines Logo
8:10 am - 10:25 am
SEA
-
BSL
41h 15m
2 stops
Multiple Airlines Logo
11:10 am - 9:04 pm
BSL
-
SEA
18h 54m
2 stops
$894Multiple Airlines
Fri, Sep 4 - Fri, Sep 18
United Airlines Logo
6:50 pm - 7:35 pm
SEA
-
BSL
15h 45m
1 stop
United Airlines Logo
2:50 pm - 9:40 am
BSL
-
SEA
27h 50m
2 stops
$896United Airlines
Tue, Jul 14 - Tue, Jul 21

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Turkish Airlines flights from Seattle to Basel EuroAirport Swiss

Our best Turkish Airlines deals on Seattle to Basel EuroAirport Swiss flight tickets
Turkish Airlines
Aug 24
SEA7:15 pmSeattle/Tacoma Intl
38h 00m
1 stop
BSL6:15 pmBasel EuroAirport Swiss
Aug 27
BSL7:10 pmBasel EuroAirport Swiss
31h 10m
1 stop
SEA5:20 pmSeattle/Tacoma Intl
$1,098
Turkish Airlines
Jul 1
SEA7:15 pmSeattle/Tacoma Intl
38h 00m
1 stop
BSL6:15 pmBasel EuroAirport Swiss
Jul 10
BSL7:10 pmBasel EuroAirport Swiss
24h 30m
1 stop
SEA10:40 amSeattle/Tacoma Intl
$1,151
Turkish Airlines
Jul 1
SEA1:30 pmSeattle/Tacoma Intl
43h 45m
2 stops
BSL6:15 pmBasel EuroAirport Swiss
Jul 10
BSL10:40 amBasel EuroAirport Swiss
33h 00m
1 stop
SEA10:40 amSeattle/Tacoma Intl
$1,324

Lufthansa flights from Seattle to Basel EuroAirport Swiss

Our best Lufthansa deals on Seattle to Basel EuroAirport Swiss flight tickets
Lufthansa
Jul 14
SEA6:50 pmSeattle/Tacoma Intl
15h 45m
1 stop
BSL7:35 pmBasel EuroAirport Swiss
Jul 20
BSL8:15 pmBasel EuroAirport Swiss
29h 44m
1 stop
SEA4:59 pmSeattle/Tacoma Intl
$880
Lufthansa
Sep 4
SEA8:10 amSeattle/Tacoma Intl
41h 15m
2 stops
BSL10:25 amBasel EuroAirport Swiss
Sep 18
BSL9:50 amBasel EuroAirport Swiss
16h 09m
1 stop
SEA4:59 pmSeattle/Tacoma Intl
$886
Lufthansa
Jul 14
SEA3:00 pmSeattle/Tacoma Intl
19h 35m
2 stops
BSL7:35 pmBasel EuroAirport Swiss
Jul 20
BSL8:15 pmBasel EuroAirport Swiss
25h 05m
2 stops
SEA12:20 pmSeattle/Tacoma Intl
$903

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 June 18, 2026.
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

Cheapest round-trip

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 8/18

6:50 pm-7:35 pm

1 stop15h 45m

Basel EuroAirport Swiss

Thu 8/27

6:00 am-11:55 am

1 stop14h 55m

$763

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 8/17

12:44 pm-7:35 pm

2 stops21h 51m

Basel EuroAirport Swiss

Wed 8/26

6:10 am-11:55 am

1 stop14h 45m

$768

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 8/17

3:54 pm-7:35 pm

2 stops18h 41m

Basel EuroAirport Swiss

Wed 8/26

9:55 am-9:07 pm

2 stops20h 12m

$777

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 8/17

5:20 pm-7:35 pm

2 stops17h 15m

Basel EuroAirport Swiss

Wed 8/26

6:10 am-4:07 pm

2 stops18h 57m

$778
Quickest round-trip

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 8/17

1:30 pm-11:00 am

1 stop12h 30m

Basel EuroAirport Swiss

Wed 8/26

11:50 am-6:25 pm

1 stop15h 35m

$843

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 7/14

6:50 pm-7:35 pm

1 stop15h 45m

Basel EuroAirport Swiss

Mon 7/20

8:15 pm-4:59 pm

1 stop29h 44m

$880

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 7/14

8:20 pm-10:50 pm

1 stop17h 30m

Basel EuroAirport Swiss

Tue 7/21

7:10 pm-11:35 am

1 stop25h 25m

$883

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 9/4

8:10 am-10:25 am

2 stops41h 15m

Basel EuroAirport Swiss

Fri 9/18

9:50 am-4:59 pm

1 stop16h 09m

$886

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 9/4

8:10 am-10:25 am

2 stops41h 15m

Basel EuroAirport Swiss

Fri 9/18

11:10 am-9:04 pm

2 stops18h 54m

$894

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 7/14

6:50 pm-7:35 pm

1 stop15h 45m

Basel EuroAirport Swiss

Tue 7/21

2:50 pm-9:40 am

2 stops27h 50m

$896

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 June, then departing from Seattle during the month April is also very affordable. Most momondo users find prices during this month for around $0.

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

You could potentially save up to 3% 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

Fastest flight time

15h 45m

Direct flights

None
The fastest flight from Seattle to Basel EuroAirport Swiss takes 15h 45m
There are no direct flights from Seattle to Basel EuroAirport Swiss. There are no popular flight routes from Seattle to Basel EuroAirport Swiss.
Search flight deals

Frequently asked questions about flying from Seattle to Basel EuroAirport Swiss

  • 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 15h 45m.

  • 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 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.

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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Sat 7/18
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