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Cheap flights from Seattle to Basel from $302

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
6:50 pm - 7:35 pm-
15h 45m
United Airlines Logo
6:05 am - 11:55 am-
14h 50m
$794United Airlines
Tue, Sep 15 - Tue, Sep 22
United Airlines Logo
6:50 pm - 7:35 pm-
15h 45m
United Airlines Logo
6:05 am - 11:55 am-
14h 50m
$794United Airlines
Sun, Sep 13 - Tue, Sep 29
United Airlines Logo
6:50 pm - 7:35 pm-
15h 45m
United Airlines Logo
6:05 am - 10:47 pm-
25h 42m
$794United Airlines
Tue, Sep 15 - Tue, Sep 22
Delta Logo
11:08 pm - 9:55 am-
25h 47m
Delta Logo
10:15 am - 4:35 pm-
15h 20m
$796Delta
Sat, Sep 12 - Tue, Sep 22
United Airlines Logo
1:10 pm - 7:35 pm-
21h 25m
United Airlines Logo
6:05 am - 2:22 pm-
17h 17m
$799United Airlines
Tue, Sep 15 - Tue, Sep 22
United Airlines Logo
2:34 pm - 7:35 pm-
20h 01m
United Airlines Logo
6:05 am - 11:55 am-
14h 50m
$799United Airlines
Sun, Sep 13 - Tue, Sep 29
Delta Logo
11:08 pm - 9:55 am-
25h 47m
Delta Logo
10:15 am - 10:05 pm-
20h 50m
$806Delta
Sat, Sep 12 - Tue, Sep 22
United Airlines Logo
10:42 am - 12:25 pm-
16h 43m
United Airlines Logo
11:00 am - 8:37 pm-
18h 37m
$809United Airlines
Sun, Sep 13 - Tue, Sep 29
Delta Logo
11:08 pm - 9:55 am-
25h 47m
Delta Logo
10:35 am - 11:15 am-
33h 40m
$816Delta
Sat, Sep 12 - Mon, Sep 21
Multiple Airlines Logo
11:04 pm - 1:40 pm-
29h 36m
Multiple Airlines Logo
8:15 pm - 4:59 pm-
29h 44m
$823Multiple Airlines
Sat, Sep 12 - Mon, Sep 21

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United Airlines flights from Seattle to Basel EuroAirport Swiss

Our best United Airlines deals on Seattle to Basel EuroAirport Swiss flight tickets
United Airlines
Sep 15
SEA6:50 pmSeattle/Tacoma Intl
15h 45m
1 stop
BSL7:35 pmBasel EuroAirport Swiss
Sep 22
BSL6:05 amBasel EuroAirport Swiss
25h 42m
2 stops
SEA10:47 pmSeattle/Tacoma Intl
$794
United Airlines
Sep 13
SEA2:34 pmSeattle/Tacoma Intl
20h 01m
2 stops
BSL7:35 pmBasel EuroAirport Swiss
Sep 29
BSL6:05 amBasel EuroAirport Swiss
14h 50m
1 stop
SEA11:55 amSeattle/Tacoma Intl
$799
United Airlines
Sep 13
SEA10:42 amSeattle/Tacoma Intl
16h 43m
2 stops
BSL12:25 pmBasel EuroAirport Swiss
Sep 29
BSL11:00 amBasel EuroAirport Swiss
18h 37m
2 stops
SEA8:37 pmSeattle/Tacoma Intl
$809

Delta flights from Seattle to Basel EuroAirport Swiss

Our best Delta deals on Seattle to Basel EuroAirport Swiss flight tickets
Delta
Sep 12
SEA11:08 pmSeattle/Tacoma Intl
25h 47m
2 stops
BSL9:55 amBasel EuroAirport Swiss
Sep 22
BSL10:15 amBasel EuroAirport Swiss
15h 20m
1 stop
SEA4:35 pmSeattle/Tacoma Intl
$796
Delta
Sep 12
SEA11:08 pmSeattle/Tacoma Intl
25h 47m
2 stops
BSL9:55 amBasel EuroAirport Swiss
Sep 22
BSL10:15 amBasel EuroAirport Swiss
20h 50m
2 stops
SEA10:05 pmSeattle/Tacoma Intl
$806
Delta
Sep 12
SEA11:08 pmSeattle/Tacoma Intl
25h 47m
2 stops
BSL9:55 amBasel EuroAirport Swiss
Sep 21
BSL10:35 amBasel EuroAirport Swiss
33h 40m
1 stop
SEA11:15 amSeattle/Tacoma Intl
$816

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 August 4, 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
Quickest round-trip

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 9/15

6:50 pm-7:35 pm

1 stop15h 45m

Basel EuroAirport Swiss

Tue 9/22

6:05 am-11:55 am

1 stop14h 50m

$794

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 9/13

6:50 pm-7:35 pm

1 stop15h 45m

Basel EuroAirport Swiss

Tue 9/29

6:05 am-11:55 am

1 stop14h 50m

$794

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 9/15

6:50 pm-7:35 pm

1 stop15h 45m

Basel EuroAirport Swiss

Tue 9/22

6:05 am-10:47 pm

2 stops25h 42m

$794

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 9/12

11:08 pm-9:55 am

2 stops25h 47m

Basel EuroAirport Swiss

Tue 9/22

10:15 am-4:35 pm

1 stop15h 20m

$796

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 9/15

1:10 pm-7:35 pm

2 stops21h 25m

Basel EuroAirport Swiss

Tue 9/22

6:05 am-2:22 pm

2 stops17h 17m

$799

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 9/13

2:34 pm-7:35 pm

2 stops20h 01m

Basel EuroAirport Swiss

Tue 9/29

6:05 am-11:55 am

1 stop14h 50m

$799

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 9/12

11:08 pm-9:55 am

2 stops25h 47m

Basel EuroAirport Swiss

Tue 9/22

10:15 am-10:05 pm

2 stops20h 50m

$806

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 9/13

10:42 am-12:25 pm

2 stops16h 43m

Basel EuroAirport Swiss

Tue 9/29

11:00 am-8:37 pm

2 stops18h 37m

$809

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 9/12

11:08 pm-9:55 am

2 stops25h 47m

Basel EuroAirport Swiss

Mon 9/21

10:35 am-11:15 am

1 stop33h 40m

$816

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 9/12

11:04 pm-1:40 pm

2 stops29h 36m

Basel EuroAirport Swiss

Mon 9/21

8:15 pm-4:59 pm

1 stop29h 44m

$823

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 airline that flies from Seattle/Tacoma Intl to Basel EuroAirport Swiss?

Lufthansa is the most popular carrier operating from Seattle/Tacoma Intl to Basel EuroAirport Swiss

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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