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Cheap flights from Seattle to Basel from $400

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 1/16. 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.
Lufthansa Logo
2:10 pm - 7:40 pm
SEA
-
BSL
20h 30m2 stops
Lufthansa Logo
9:50 am - 7:16 pm
BSL
-
SEA
18h 26m2 stops
$470Lufthansa
Tue, Jan 13 - Tue, Jan 20
British Airways Logo
8:04 am - 10:20 pm
SEA
-
BSL
29h 16m2 stops
British Airways Logo
7:00 am - 4:55 pm
BSL
-
SEA
18h 55m1 stop
$482British Airways
Tue, Jan 13 - Tue, Jan 20
British Airways Logo
6:50 pm - 10:20 pm
SEA
-
BSL
18h 30m1 stop
British Airways Logo
7:00 am - 11:30 am
BSL
-
SEA
13h 30m1 stop
$485British Airways
Tue, Jan 13 - Tue, Jan 20
British Airways Logo
6:50 pm - 10:05 pm
SEA
-
BSL
18h 15m1 stop
British Airways Logo
6:35 am - 4:55 pm
BSL
-
SEA
19h 20m1 stop
$487British Airways
Wed, Jan 14 - Sun, Jan 18
United Airlines Logo
3:10 pm - 7:40 pm
SEA
-
BSL
19h 30m1 stop
United Airlines Logo
1:10 pm - 3:44 pm
BSL
-
SEA
35h 34m2 stops
$495United Airlines
Wed, Jan 14 - Sun, Jan 18
United Airlines Logo
2:10 pm - 7:40 pm
SEA
-
BSL
20h 30m2 stops
United Airlines Logo
1:10 pm - 11:30 am
BSL
-
SEA
31h 20m2 stops
$499United Airlines
Wed, Jan 14 - Sun, Jan 18
United Airlines Logo
12:35 pm - 4:05 pm
SEA
-
BSL
42h 30m3 stops
United Airlines Logo
9:50 am - 12:59 am
BSL
-
SEA
24h 09m2 stops
$510United Airlines
Tue, Jan 13 - Tue, Jan 20
United Airlines Logo
11:00 am - 12:30 pm
SEA
-
BSL
16h 30m2 stops
United Airlines Logo
9:50 am - 1:20 pm
BSL
-
SEA
12h 30m1 stop
$589United Airlines
Tue, Jan 6 - Fri, Feb 6
Multiple Airlines Logo
7:40 am - 10:40 am
SEA
-
BSL
18h 00m2 stops
Multiple Airlines Logo
6:05 am - 11:40 am
BSL
-
SEA
14h 35m1 stop
$594Multiple Airlines
Wed, Jan 7 - Thu, Feb 5
Multiple Airlines Logo
3:10 pm - 10:05 pm
SEA
-
BSL
21h 55m1 stop
Multiple Airlines Logo
6:05 am - 3:00 pm
BSL
-
SEA
17h 55m2 stops
$595Multiple Airlines
Tue, Jan 6 - Thu, Feb 5

Lufthansa flights from Seattle to Basel EuroAirport Swiss

Our best Lufthansa deals on Seattle to Basel EuroAirport Swiss flight tickets
Lufthansa
Jan 13
SEA2:10 pmSeattle/Tacoma Intl
20h 30m
2 stops
BSL7:40 pmBasel EuroAirport Swiss
Jan 20
BSL9:50 amBasel EuroAirport Swiss
18h 26m
2 stops
SEA7:16 pmSeattle/Tacoma Intl
$470
Find similar
Lufthansa
Dec 26
SEA7:00 amSeattle/Tacoma Intl
18h 05m
2 stops
BSL10:05 amBasel EuroAirport Swiss
Jan 5
BSL1:10 pmBasel EuroAirport Swiss
40h 47m
2 stops
SEA8:57 pmSeattle/Tacoma Intl
$1,394
Find similar

British Airways flights from Seattle to Basel EuroAirport Swiss

Our best British Airways deals on Seattle to Basel EuroAirport Swiss flight tickets
British Airways
Jan 13
SEA8:04 amSeattle/Tacoma Intl
29h 16m
2 stops
BSL10:20 pmBasel EuroAirport Swiss
Jan 20
BSL7:00 amBasel EuroAirport Swiss
18h 55m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$482
Find similar
British Airways
Jan 13
SEA6:50 pmSeattle/Tacoma Intl
18h 30m
1 stop
BSL10:20 pmBasel EuroAirport Swiss
Jan 20
BSL7:00 amBasel EuroAirport Swiss
13h 30m
1 stop
SEA11:30 amSeattle/Tacoma Intl
$485
Find similar
British Airways
Jan 14
SEA6:50 pmSeattle/Tacoma Intl
30h 25m
1 stop
BSL10:15 amBasel EuroAirport Swiss
Jan 18
BSL11:20 amBasel EuroAirport Swiss
14h 35m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$487
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 December 18, 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

Tue 1/13

2:10 pm-7:40 pm

2 stops20h 30m

Basel EuroAirport Swiss

Tue 1/20

9:50 am-7:16 pm

2 stops18h 26m

$470

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 1/13

8:04 am-10:20 pm

2 stops29h 16m

Basel EuroAirport Swiss

Tue 1/20

7:00 am-4:55 pm

1 stop18h 55m

$482

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 1/13

6:50 pm-10:20 pm

1 stop18h 30m

Basel EuroAirport Swiss

Tue 1/20

7:00 am-11:30 am

1 stop13h 30m

$485

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 1/14

6:50 pm-10:05 pm

1 stop18h 15m

Basel EuroAirport Swiss

Sun 1/18

6:35 am-4:55 pm

1 stop19h 20m

$487

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 1/14

3:10 pm-7:40 pm

1 stop19h 30m

Basel EuroAirport Swiss

Sun 1/18

1:10 pm-3:44 pm

2 stops35h 34m

$495

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 1/14

2:10 pm-7:40 pm

2 stops20h 30m

Basel EuroAirport Swiss

Sun 1/18

1:10 pm-11:30 am

2 stops31h 20m

$499

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 1/13

12:35 pm-4:05 pm

3 stops42h 30m

Basel EuroAirport Swiss

Tue 1/20

9:50 am-12:59 am

2 stops24h 09m

$510

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 1/6

11:00 am-12:30 pm

2 stops16h 30m

Basel EuroAirport Swiss

Fri 2/6

9:50 am-1:20 pm

1 stop12h 30m

$589

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 1/7

7:40 am-10:40 am

2 stops18h 00m

Basel EuroAirport Swiss

Thu 2/5

6:05 am-11:40 am

1 stop14h 35m

$594

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 1/6

3:10 pm-10:05 pm

1 stop21h 55m

Basel EuroAirport Swiss

Thu 2/5

6:05 am-3:00 pm

2 stops17h 55m

$595

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 17 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 February is also very affordable. Most momondo users find prices during this month for around $509.

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

Fastest flight time

14h 50m

Direct flights

None
The fastest flight from Seattle to Basel EuroAirport Swiss takes 14h 50m
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

  • 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 14h 50m.

  • 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 $467Free CancellationRating
6.7
7,585 reviews
Search British Airways flights
LufthansaPriceFrom $483Free CancellationRating
6.8
7,635 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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