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Cheap flights from Seattle to Basel from $379

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 1/20. 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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Cheap round-trip flights

British Airways Logo
6:50 pm - 10:15 amSEA-BSL
30h 25m1 stop
British Airways Logo
3:40 pm - 11:30 amBSL-SEA
28h 50m1 stop
$452British Airways
Find Deal
Sun, Dec 7 - Thu, Dec 18
British Airways Logo
9:00 am - 3:05 pmSEA-BSL
21h 05m2 stops
British Airways Logo
11:00 am - 11:38 pmBSL-SEA
21h 38m2 stops
$467British Airways
Find Deal
Tue, Dec 9 - Tue, Dec 16
Air France Logo
3:10 pm - 1:50 pmSEA-BSL
14h 40m1 stop
Air France Logo
11:15 am - 11:45 amBSL-SEA
33h 30m1 stop
$468Air France
Find Deal
Wed, Oct 29 - Wed, Nov 5
Delta Logo
2:05 pm - 9:50 amSEA-BSL
34h 45m1 stop
Delta Logo
6:05 am - 11:50 amBSL-SEA
14h 45m1 stop
$470Delta
Find Deal
Sun, Dec 7 - Tue, Dec 16
Delta Logo
11:00 pm - 9:50 amSEA-BSL
25h 50m2 stops
Delta Logo
6:05 am - 11:50 amBSL-SEA
14h 45m1 stop
$473Delta
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Sat, Dec 6 - Tue, Dec 16
Multiple Airlines Logo
3:10 pm - 1:50 pmSEA-BSL
14h 40m1 stop
Multiple Airlines Logo
6:05 am - 2:45 pmBSL-SEA
17h 40m2 stops
$478Multiple Airlines
Find Deal
Wed, Oct 29 - Wed, Nov 5
Air France Logo
6:35 pm - 9:30 amSEA-BSL
29h 55m1 stop
Air France Logo
6:25 pm - 4:05 pmBSL-SEA
30h 40m1 stop
$500Air France
Find Deal
Mon, Oct 13 - Mon, Oct 20
Multiple Airlines Logo
7:46 am - 2:10 pmSEA-BSL
21h 24m2 stops
Multiple Airlines Logo
7:00 am - 7:25 pmBSL-SEA
21h 25m2 stops
$516Multiple Airlines
Find Deal
Fri, Jan 30 - Tue, Feb 3
Lufthansa Logo
2:00 pm - 1:15 pmSEA-BSL
14h 15m1 stop
Lufthansa Logo
6:35 am - 10:47 pmBSL-SEA
25h 12m2 stops
$522Lufthansa
Find Deal
Mon, Dec 8 - Thu, Dec 18
Lufthansa Logo
1:40 pm - 7:40 pmSEA-BSL
21h 00m2 stops
Lufthansa Logo
6:35 am - 10:47 pmBSL-SEA
25h 12m2 stops
$523Lufthansa
Find Deal
Tue, Dec 9 - Thu, Dec 18

British Airways flights from Seattle to Basel EuroAirport Swiss

Our best British Airways deals on Seattle to Basel EuroAirport Swiss flight tickets
British Airways
Dec 7
SEA6:50 pmSeattle/Tacoma Intl
30h 25m
1 stop
BSL10:15 amBasel EuroAirport Swiss
Dec 18
BSL3:40 pmBasel EuroAirport Swiss
28h 50m
1 stop
SEA11:30 amSeattle/Tacoma Intl
$452
Find similar
British Airways
Dec 9
SEA9:00 amSeattle/Tacoma Intl
21h 05m
2 stops
BSL3:05 pmBasel EuroAirport Swiss
Dec 16
BSL11:00 amBasel EuroAirport Swiss
21h 38m
2 stops
SEA11:38 pmSeattle/Tacoma Intl
$467
Find similar
British Airways
Dec 6
SEA1:35 pmSeattle/Tacoma Intl
13h 30m
1 stop
BSL12:05 pmBasel EuroAirport Swiss
Dec 18
BSL7:35 pmBasel EuroAirport Swiss
24h 55m
1 stop
SEA11:30 amSeattle/Tacoma Intl
$502
Find similar

Air France flights from Seattle to Basel EuroAirport Swiss

Our best Air France deals on Seattle to Basel EuroAirport Swiss flight tickets
Air France
Oct 29
SEA3:10 pmSeattle/Tacoma Intl
14h 40m
1 stop
BSL1:50 pmBasel EuroAirport Swiss
Nov 5
BSL11:15 amBasel EuroAirport Swiss
33h 30m
1 stop
SEA11:45 amSeattle/Tacoma Intl
$468
Find similar
Air France
Oct 13
SEA6:35 pmSeattle/Tacoma Intl
29h 55m
1 stop
BSL9:30 amBasel EuroAirport Swiss
Oct 20
BSL6:25 pmBasel EuroAirport Swiss
30h 40m
1 stop
SEA4:05 pmSeattle/Tacoma Intl
$500
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 September 16, 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

Sun 12/7

6:50 pm-10:15 am

1 stop30h 25m

Basel EuroAirport Swiss

Thu 12/18

3:40 pm-11:30 am

1 stop28h 50m

$452

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/9

9:00 am-3:05 pm

2 stops21h 05m

Basel EuroAirport Swiss

Tue 12/16

11:00 am-11:38 pm

2 stops21h 38m

$467

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 10/29

3:10 pm-1:50 pm

1 stop14h 40m

Basel EuroAirport Swiss

Wed 11/5

11:15 am-11:45 am

1 stop33h 30m

$468

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 12/7

2:05 pm-9:50 am

1 stop34h 45m

Basel EuroAirport Swiss

Tue 12/16

6:05 am-11:50 am

1 stop14h 45m

$470

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 12/6

11:00 pm-9:50 am

2 stops25h 50m

Basel EuroAirport Swiss

Tue 12/16

6:05 am-11:50 am

1 stop14h 45m

$473

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 10/29

3:10 pm-1:50 pm

1 stop14h 40m

Basel EuroAirport Swiss

Wed 11/5

6:05 am-2:45 pm

2 stops17h 40m

$478

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 10/13

6:35 pm-9:30 am

1 stop29h 55m

Basel EuroAirport Swiss

Mon 10/20

6:25 pm-4:05 pm

1 stop30h 40m

$500

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 1/30

7:46 am-2:10 pm

2 stops21h 24m

Basel EuroAirport Swiss

Tue 2/3

7:00 am-7:25 pm

2 stops21h 25m

$516

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 12/8

2:00 pm-1:15 pm

1 stop14h 15m

Basel EuroAirport Swiss

Thu 12/18

6:35 am-10:47 pm

2 stops25h 12m

$522

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/9

1:40 pm-7:40 pm

2 stops21h 00m

Basel EuroAirport Swiss

Thu 12/18

6:35 am-10:47 pm

2 stops25h 12m

$523

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 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 46% 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

Direct flights

None
There are no direct flights from Seattle to Basel EuroAirport Swiss. There are no popular flight routes from Seattle to 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
6.7
7,363 reviews
Search British Airways flights
DeltaPriceFrom $513Free CancellationRating
7.9
7,957 reviews
Search Delta flights
LufthansaPriceFrom $571Free CancellationRating
6.8
7,407 reviews
Search Lufthansa 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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