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Cheap flights from Seattle to Basel from $478

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 9/7. 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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Find the cheapest flights from Seattle to Basel

Cheap round-trip flights

British Airways Logo
6:50 pm - 3:05 pmSEA-BSL
35h 15m1 stop
British Airways Logo
11:20 am - 4:55 pmBSL-SEA
14h 35m1 stop
$501British Airways
Find Deal
Wed, Nov 19 - Sun, Nov 23
British Airways Logo
6:50 pm - 6:40 pmSEA-BSL
14h 50m1 stop
British Airways Logo
6:35 am - 4:55 pmBSL-SEA
19h 20m1 stop
$502British Airways
Find Deal
Wed, Nov 19 - Sun, Nov 23
British Airways Logo
6:50 pm - 10:15 amSEA-BSL
30h 25m1 stop
British Airways Logo
7:00 am - 4:55 pmBSL-SEA
18h 55m1 stop
$506British Airways
Find Deal
Mon, Dec 8 - Fri, Dec 26
Lufthansa Logo
10:05 am - 6:30 pmSEA-BSL
23h 25m2 stops
Lufthansa Logo
6:45 am - 7:16 pmBSL-SEA
21h 31m2 stops
$531Lufthansa
Find Deal
Wed, Nov 19 - Sun, Nov 23
Lufthansa Logo
3:00 pm - 1:35 pmSEA-BSL
14h 35m1 stop
Lufthansa Logo
7:05 pm - 12:10 pmBSL-SEA
26h 05m1 stop
$540Lufthansa
Find Deal
Tue, Oct 28 - Mon, Nov 10
Logo
4:51 pm - 6:30 pmSEA-BSL
16h 39m2 stops
Logo
6:40 am - 8:09 pmBSL-SEA
22h 29m2 stops
$569
Find Deal
Tue, Sep 9 - Wed, Sep 24
Logo
4:51 pm - 6:30 pmSEA-BSL
16h 39m2 stops
Logo
6:40 am - 11:35 amBSL-SEA
13h 55m1 stop
$609
Find Deal
Tue, Sep 9 - Wed, Sep 24
United Airlines Logo
9:05 am - 7:40 pmSEA-BSL
25h 35m2 stops
United Airlines Logo
9:50 am - 6:45 pmBSL-SEA
17h 55m2 stops
$638United Airlines
Find Deal
Tue, Dec 16 - Tue, Dec 23
United Airlines Logo
7:00 am - 10:50 amSEA-BSL
18h 50m2 stops
United Airlines Logo
11:30 am - 6:36 pmBSL-SEA
40h 06m2 stops
$640United Airlines
Find Deal
Mon, Sep 1 - Mon, Sep 15
KLM Logo
1:55 pm - 1:50 pmSEA-BSL
14h 55m1 stop
KLM Logo
10:10 am - 5:40 pmBSL-SEA
16h 30m1 stop
$668KLM
Find Deal
Sun, Sep 7 - Wed, Sep 24

Lufthansa flights from Seattle to Basel

Our best Lufthansa deals on Seattle to Basel flight tickets
Lufthansa
Nov 19
SEA10:05 amSeattle/Tacoma Intl
23h 25m
2 stops
BSL6:30 pmBasel EuroAirport Swiss
Nov 23
BSL6:45 amBasel EuroAirport Swiss
21h 31m
2 stops
SEA7:16 pmSeattle/Tacoma Intl
$531
Find similar
Lufthansa
Oct 28
SEA3:00 pmSeattle/Tacoma Intl
14h 35m
1 stop
BSL1:35 pmBasel EuroAirport Swiss
Nov 10
BSL7:05 pmBasel EuroAirport Swiss
26h 05m
1 stop
SEA12:10 pmSeattle/Tacoma Intl
$540
Find similar
Lufthansa
Nov 19
SEA10:05 amSeattle/Tacoma Intl
18h 30m
2 stops
BSL1:35 pmBasel EuroAirport Swiss
Nov 23
BSL9:45 amBasel EuroAirport Swiss
12h 35m
1 stop
SEA1:20 pmSeattle/Tacoma Intl
$542
Find similar

British Airways flights from Seattle to Basel

Our best British Airways deals on Seattle to Basel flight tickets
British Airways
Nov 19
SEA6:50 pmSeattle/Tacoma Intl
35h 15m
1 stop
BSL3:05 pmBasel EuroAirport Swiss
Nov 23
BSL11:20 amBasel EuroAirport Swiss
14h 35m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$501
Find similar
British Airways
Nov 19
SEA6:50 pmSeattle/Tacoma Intl
14h 50m
1 stop
BSL6:40 pmBasel EuroAirport Swiss
Nov 23
BSL6:35 amBasel EuroAirport Swiss
19h 20m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$502
Find similar
British Airways
Dec 8
SEA6:50 pmSeattle/Tacoma Intl
30h 25m
1 stop
BSL10:15 amBasel EuroAirport Swiss
Dec 26
BSL7:00 amBasel EuroAirport Swiss
18h 55m
1 stop
SEA4:55 pmSeattle/Tacoma Intl
$506
Find similar

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 August 14, 2025.
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 11/19

6:50 pm-3:05 pm

1 stop35h 15m

Basel EuroAirport Swiss

Sun 11/23

11:20 am-4:55 pm

1 stop14h 35m

$501

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 11/19

6:50 pm-6:40 pm

1 stop14h 50m

Basel EuroAirport Swiss

Sun 11/23

6:35 am-4:55 pm

1 stop19h 20m

$502

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 12/8

6:50 pm-10:15 am

1 stop30h 25m

Basel EuroAirport Swiss

Fri 12/26

7:00 am-4:55 pm

1 stop18h 55m

$506

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Wed 11/19

10:05 am-6:30 pm

2 stops23h 25m

Basel EuroAirport Swiss

Sun 11/23

6:45 am-7:16 pm

2 stops21h 31m

$531

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 10/28

3:00 pm-1:35 pm

1 stop14h 35m

Basel EuroAirport Swiss

Mon 11/10

7:05 pm-12:10 pm

1 stop26h 05m

$540

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 9/9

4:51 pm-6:30 pm

2 stops16h 39m

Basel EuroAirport Swiss

Wed 9/24

6:40 am-8:09 pm

2 stops22h 29m

$569

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 9/9

4:51 pm-6:30 pm

2 stops16h 39m

Basel EuroAirport Swiss

Wed 9/24

6:40 am-11:35 am

1 stop13h 55m

$609

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 12/16

9:05 am-7:40 pm

2 stops25h 35m

Basel EuroAirport Swiss

Tue 12/23

9:50 am-6:45 pm

2 stops17h 55m

$638

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 9/1

7:00 am-10:50 am

2 stops18h 50m

Basel EuroAirport Swiss

Mon 9/15

11:30 am-6:36 pm

2 stops40h 06m

$640

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 9/7

1:55 pm-1:50 pm

1 stop14h 55m

Basel EuroAirport Swiss

Wed 9/24

10:10 am-5:40 pm

1 stop16h 30m

$668

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?

What is the cheapest month to fly to Basel?

If you aren’t able to travel to Basel during the month of February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $566.

What is the cheapest day to depart on your flight to Basel?

On average, the least expensive day to fly to Basel from Seattle is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $561. However, this price may fluctuate depending on the airline, the season, and holidays. The most expensive day to fly to Basel is Thursday, with ticket prices averaging around $997.

What is the cheapest time of day to depart on your flight to Basel?

In the morning is the cheapest time of day to fly from Seattle to Basel when you can find flight prices for as low as $643. Flying to Basel in the morning is an ideal time because this is during off-peak travel hours. Flights to Basel are more costly in the evening, with an average ticket price of $675. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

Can stopping save me money on Seattle to Basel flights?

You could potentially save up to 57% 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

Best Price Found

$478

Fastest flight time

11h 30m

Direct flights

None

Airports in Basel

1 airport
The best one-way flight to Basel from Seattle in the past 72 hours is $478. The best round-trip flight deal from Seattle to Basel found on momondo in the last 72 hours is $501.
The fastest flight from Seattle to Basel takes 11h 30m
There are no direct flights from Seattle to Basel. Popular non-direct route for this connection is Seattle/Tacoma Intl Airport - Basel EuroAirport Swiss.
There is 1 airport near Basel: Basel EuroAirport Swiss (BSL)
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 11h 35m 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 $443Free CancellationRating
6.6
7,266 reviews
Search British Airways flights
DeltaPriceFrom $513Free CancellationRating
8.0
7,980 reviews
Search Delta flights
LufthansaPriceFrom $571Free CancellationRating
6.8
7,317 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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