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Cheap flights from Seattle to Basel from $335

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 3/17. 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
0 bags

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Find the cheapest flights from Seattle to Basel

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:10 pm - 1:50 pm
SEA
-
BSL
14h 40m
1 stop
Multiple Airlines Logo
6:30 am - 4:30 pm
BSL
-
SEA
19h 00m
1 stop
$513Multiple Airlines
Wed, Mar 25 - Wed, Apr 1
Delta Logo
9:25 am - 1:50 pm
SEA
-
BSL
20h 25m
2 stops
Delta Logo
6:30 am - 4:30 pm
BSL
-
SEA
19h 00m
1 stop
$517Delta
Wed, Mar 25 - Wed, Apr 1
Delta Logo
9:25 am - 1:50 pm
SEA
-
BSL
20h 25m
2 stops
Delta Logo
10:15 am - 10:10 pm
BSL
-
SEA
20h 55m
2 stops
$527Delta
Wed, Mar 25 - Wed, Apr 1
Air France Logo
4:05 pm - 10:40 am
SEA
-
BSL
34h 35m
1 stop
Air France Logo
6:30 am - 11:45 am
BSL
-
SEA
14h 15m
1 stop
$579Air France
Thu, Mar 26 - Thu, Apr 2
KLM Logo
4:05 pm - 10:40 am
SEA
-
BSL
34h 35m
1 stop
KLM Logo
6:30 pm - 4:30 pm
BSL
-
SEA
31h 00m
1 stop
$590KLM
Tue, Mar 24 - Mon, Mar 30
Air France Logo
8:25 am - 10:40 am
SEA
-
BSL
18h 15m
2 stops
Air France Logo
6:30 pm - 4:30 pm
BSL
-
SEA
31h 00m
1 stop
$594Air France
Tue, Mar 24 - Mon, Mar 30
Air France Logo
1:45 pm - 5:55 pm
SEA
-
BSL
19h 10m
1 stop
Air France Logo
6:30 pm - 11:45 am
BSL
-
SEA
26h 15m
1 stop
$628Air France
Sat, Apr 4 - Sun, Apr 12
Air France Logo
4:05 pm - 10:05 pm
SEA
-
BSL
22h 00m
1 stop
Air France Logo
2:25 pm - 11:45 am
BSL
-
SEA
30h 20m
1 stop
$680Air France
Thu, Mar 26 - Mon, Mar 30
British Airways Logo
1:37 pm - 10:20 pm
SEA
-
BSL
24h 43m
2 stops
British Airways Logo
7:40 pm - 12:24 am
BSL
-
SEA
37h 44m
2 stops
$681British Airways
Tue, Mar 24 - Mon, Mar 30
Air France Logo
1:45 pm - 1:55 pm
SEA
-
BSL
15h 10m
1 stop
Air France Logo
2:25 pm - 11:45 am
BSL
-
SEA
30h 20m
1 stop
$711Air France
Fri, Apr 3 - Sun, Apr 12

United Airlines flights from Seattle to Basel

Our best United Airlines deals on Seattle to Basel flight tickets
United Airlines
Mar 25
SEA12:55 pmSeattle/Tacoma Intl
22h 45m
2 stops
BSL7:40 pmBasel EuroAirport Swiss
Apr 1
BSL8:25 amBasel EuroAirport Swiss
24h 02m
3 stops
SEA11:27 pmSeattle/Tacoma Intl
$844
United Airlines
Jul 25
SEA7:20 pmSeattle/Tacoma Intl
37h 50m
2 stops
BSL6:10 pmBasel EuroAirport Swiss
Jul 31
BSL8:25 amBasel EuroAirport Swiss
12h 30m
1 stop
SEA11:55 amSeattle/Tacoma Intl
$912
United Airlines
Apr 4
SEA11:35 pmSeattle/Tacoma Intl
27h 50m
2 stops
BSL12:25 pmBasel EuroAirport Swiss
Apr 12
BSL2:40 pmBasel EuroAirport Swiss
41h 47m
3 stops
SEA11:27 pmSeattle/Tacoma Intl
$915

Lufthansa flights from Seattle to Basel

Our best Lufthansa deals on Seattle to Basel flight tickets
Lufthansa
Aug 25
SEA6:50 pmSeattle/Tacoma Intl
14h 20m
2 stops
BSL6:10 pmBasel EuroAirport Swiss
Sep 15
BSL8:15 amBasel EuroAirport Swiss
15h 07m
2 stops
SEA2:22 pmSeattle/Tacoma Intl
$834
Lufthansa
Jul 26
SEA6:50 pmSeattle/Tacoma Intl
14h 20m
2 stops
BSL6:10 pmBasel EuroAirport Swiss
Jul 31
BSL1:00 pmBasel EuroAirport Swiss
12h 59m
1 stop
SEA4:59 pmSeattle/Tacoma Intl
$869
Lufthansa
Aug 26
SEA6:50 pmSeattle/Tacoma Intl
14h 20m
2 stops
BSL6:10 pmBasel EuroAirport Swiss
Aug 31
BSL8:20 amBasel EuroAirport Swiss
12h 35m
1 stop
SEA11:55 amSeattle/Tacoma Intl
$921

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 February 27, 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

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 3/25

3:10 pm-1:50 pm

1 stop14h 40m

Basel EuroAirport Swiss

Wed 4/1

6:30 am-4:30 pm

1 stop19h 00m

$513

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 3/25

9:25 am-1:50 pm

2 stops20h 25m

Basel EuroAirport Swiss

Wed 4/1

6:30 am-4:30 pm

1 stop19h 00m

$517

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 3/25

9:25 am-1:50 pm

2 stops20h 25m

Basel EuroAirport Swiss

Wed 4/1

10:15 am-10:10 pm

2 stops20h 55m

$527

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 3/26

4:05 pm-10:40 am

1 stop34h 35m

Basel EuroAirport Swiss

Thu 4/2

6:30 am-11:45 am

1 stop14h 15m

$579

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 3/24

4:05 pm-10:40 am

1 stop34h 35m

Basel EuroAirport Swiss

Mon 3/30

6:30 pm-4:30 pm

1 stop31h 00m

$590

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 3/24

8:25 am-10:40 am

2 stops18h 15m

Basel EuroAirport Swiss

Mon 3/30

6:30 pm-4:30 pm

1 stop31h 00m

$594

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 4/4

1:45 pm-5:55 pm

1 stop19h 10m

Basel EuroAirport Swiss

Sun 4/12

6:30 pm-11:45 am

1 stop26h 15m

$628

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Thu 3/26

4:05 pm-10:05 pm

1 stop22h 00m

Basel EuroAirport Swiss

Mon 3/30

2:25 pm-11:45 am

1 stop30h 20m

$680

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 3/24

1:37 pm-10:20 pm

2 stops24h 43m

Basel EuroAirport Swiss

Mon 3/30

7:40 pm-12:24 am

2 stops37h 44m

$681

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 4/3

1:45 pm-1:55 pm

1 stop15h 10m

Basel EuroAirport Swiss

Sun 4/12

2:25 pm-11:45 am

1 stop30h 20m

$711

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

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 typical price of a round-trip flight between Seattle and Basel?

Can stopping save me money on Seattle to Basel flights?

You could potentially save up to 3% on your flight if you consider stops on a Seattle to Basel flight.

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

12h 25m

Direct flights

None
The fastest flight from Seattle to Basel takes 12h 25m
There are no direct flights from Seattle to Basel. There are no popular flight routes from Seattle to Basel.
Search flight deals

  • 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 12h 25m 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 many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Basel?

  • 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?

Best airlines flying from Seattle to Basel

Compare and see reviews for airlines that fly from Seattle to Basel with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $467Free CancellationRating
6.7
7,771 reviews
Search British Airways flights
LufthansaPriceFrom $483Free CancellationRating
6.8
7,814 reviews
Search Lufthansa flights

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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