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Cheap flights from Seattle to Basel from $367

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 12/11. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
6:50 pm - 10:20 pmSEA-BSL
18h 30m1 stop
British Airways Logo
11:10 am - 4:55 pmBSL-SEA
14h 45m1 stop
$437British Airways
Find Deal
Sun, Feb 8 - Wed, Feb 18
British Airways Logo
8:04 am - 3:05 pmSEA-BSL
22h 01m2 stops
British Airways Logo
6:20 am - 4:55 pmBSL-SEA
19h 35m1 stop
$441British Airways
Find Deal
Sun, Feb 8 - Wed, Feb 18
United Airlines Logo
8:40 am - 12:30 pmSEA-BSL
18h 50m3 stops
United Airlines Logo
9:50 am - 10:16 pmBSL-SEA
21h 26m2 stops
$494United Airlines
Find Deal
Sun, Feb 8 - Wed, Feb 18
United Airlines Logo
5:05 am - 7:40 pmSEA-BSL
29h 35m2 stops
United Airlines Logo
9:50 am - 12:50 amBSL-SEA
24h 00m2 stops
$496United Airlines
Find Deal
Sat, Nov 29 - Sat, Dec 6
Air France Logo
3:05 pm - 5:25 pmSEA-BSL
17h 20m1 stop
Air France Logo
11:15 am - 11:50 amBSL-SEA
33h 35m1 stop
$514Air France
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Tue, Dec 16 - Tue, Dec 23
Air France Logo
3:05 pm - 5:25 pmSEA-BSL
17h 20m1 stop
Air France Logo
11:15 am - 10:25 pmBSL-SEA
20h 10m2 stops
$524Air France
Find Deal
Tue, Dec 16 - Tue, Dec 23
Lufthansa Logo
10:05 am - 4:05 pmSEA-BSL
22h 00m2 stops
Lufthansa Logo
11:00 am - 7:18 pmBSL-SEA
17h 18m2 stops
$631Lufthansa
Find Deal
Fri, Mar 27 - Tue, Mar 31
Lufthansa Logo
10:55 am - 12:30 pmSEA-BSL
16h 35m2 stops
Lufthansa Logo
9:50 am - 1:20 pmBSL-SEA
12h 30m1 stop
$761Lufthansa
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Sat, Feb 14 - Wed, Feb 25
Multiple Airlines Logo
8:10 am - 1:35 pmSEA-BSL
20h 25m2 stops
Multiple Airlines Logo
9:50 am - 9:31 amBSL-SEA
32h 41m2 stops
$892Multiple Airlines
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Tue, Nov 25 - Sun, Nov 30
Multiple Airlines Logo
8:10 am - 12:30 pmSEA-BSL
19h 20m2 stops
Multiple Airlines Logo
7:05 pm - 12:10 pmBSL-SEA
26h 05m1 stop
$916Multiple Airlines
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Sun, Dec 28 - Mon, Jan 5

British Airways flights from Seattle to Basel EuroAirport Swiss

Our best British Airways deals on Seattle to Basel EuroAirport Swiss flight tickets
British Airways
Feb 8
SEA6:50 pmSeattle/Tacoma Intl
18h 30m
1 stop
BSL10:20 pmBasel EuroAirport Swiss
Feb 18
BSL11:10 amBasel EuroAirport Swiss
14h 45m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$437
Find similar
British Airways
Feb 8
SEA8:04 amSeattle/Tacoma Intl
22h 01m
2 stops
BSL3:05 pmBasel EuroAirport Swiss
Feb 18
BSL6:20 amBasel EuroAirport Swiss
19h 35m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$441
Find similar
British Airways
Feb 8
SEA8:04 amSeattle/Tacoma Intl
22h 01m
2 stops
BSL3:05 pmBasel EuroAirport Swiss
Feb 18
BSL6:20 amBasel EuroAirport Swiss
24h 57m
2 stops
SEA10:17 pmSeattle/Tacoma Intl
$479
Find similar

United Airlines flights from Seattle to Basel EuroAirport Swiss

Our best United Airlines deals on Seattle to Basel EuroAirport Swiss flight tickets
United Airlines
Feb 8
SEA8:40 amSeattle/Tacoma Intl
18h 50m
3 stops
BSL12:30 pmBasel EuroAirport Swiss
Feb 18
BSL9:50 amBasel EuroAirport Swiss
21h 26m
2 stops
SEA10:16 pmSeattle/Tacoma Intl
$494
Find similar
United Airlines
Nov 29
SEA5:05 amSeattle/Tacoma Intl
29h 35m
2 stops
BSL7:40 pmBasel EuroAirport Swiss
Dec 6
BSL9:50 amBasel EuroAirport Swiss
24h 00m
2 stops
SEA12:50 amSeattle/Tacoma Intl
$496
Find similar
United Airlines
Nov 8
SEA11:30 pmSeattle/Tacoma Intl
35h 10m
2 stops
BSL7:40 pmBasel EuroAirport Swiss
Nov 16
BSL1:10 pmBasel EuroAirport Swiss
42h 20m
2 stops
SEA10:30 pmSeattle/Tacoma Intl
$561
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 November 3, 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 2/8

6:50 pm-10:20 pm

1 stop18h 30m

Basel EuroAirport Swiss

Wed 2/18

11:10 am-4:55 pm

1 stop14h 45m

$437

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 2/8

8:04 am-3:05 pm

2 stops22h 01m

Basel EuroAirport Swiss

Wed 2/18

6:20 am-4:55 pm

1 stop19h 35m

$441

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 2/8

8:40 am-12:30 pm

3 stops18h 50m

Basel EuroAirport Swiss

Wed 2/18

9:50 am-10:16 pm

2 stops21h 26m

$494

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 11/29

5:05 am-7:40 pm

2 stops29h 35m

Basel EuroAirport Swiss

Sat 12/6

9:50 am-12:50 am

2 stops24h 00m

$496

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/16

3:05 pm-5:25 pm

1 stop17h 20m

Basel EuroAirport Swiss

Tue 12/23

11:15 am-11:50 am

1 stop33h 35m

$514

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/16

3:05 pm-5:25 pm

1 stop17h 20m

Basel EuroAirport Swiss

Tue 12/23

11:15 am-10:25 pm

2 stops20h 10m

$524

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 3/27

10:05 am-4:05 pm

2 stops22h 00m

Basel EuroAirport Swiss

Tue 3/31

11:00 am-7:18 pm

2 stops17h 18m

$631

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 2/14

10:55 am-12:30 pm

2 stops16h 35m

Basel EuroAirport Swiss

Wed 2/25

9:50 am-1:20 pm

1 stop12h 30m

$761

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 11/25

8:10 am-1:35 pm

2 stops20h 25m

Basel EuroAirport Swiss

Sun 11/30

9:50 am-9:31 am

2 stops32h 41m

$892

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 12/28

8:10 am-12:30 pm

2 stops19h 20m

Basel EuroAirport Swiss

Mon 1/5

7:05 pm-12:10 pm

1 stop26h 05m

$916

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 $502.

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 28% 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 12h 20m.

  • 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 $481Free CancellationRating
6.7
7,494 reviews
Search British Airways flights
LufthansaPriceFrom $497Free CancellationRating
6.8
7,544 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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