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$566+ Cheap flights from Basel EuroAirport Swiss (BSL) to Seattle (SEA)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/19. Fares are subject to change and may not be available on all flights or dates of travel.
BSL — SEA
nov. 29 — dic. 61
sáb. 11/29
sáb. 12/6
1 adult, Economy
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Find flight deals from Basel to Seattle

Cheapest flights from Basel to Seattle
Explore the most affordable flight options available from Basel to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on octubre 30, 2025.

This American Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/136:05 amBSL - SEA
2 stops22h 39mAmerican Airlines
mar. 11/189:00 amSEA - BSL
2 stops21h 05mAmerican Airlines
Deal found 10/29$596
This Delta deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/136:05 amBSL - SEA
1 stop14h 40mDelta
mar. 11/181:40 pmSEA - BSL
1 stop15h 10mDelta
Deal found 10/29$606
This Flightnetwork deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/1310:35 amBSL - SEA
2 stops20h 41mMultiple Airlines
mar. 11/1810:05 amSEA - BSL
2 stops17h 25mMultiple Airlines
Deal found 10/29$653
This Lufthansa deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/179:50 amBSL - SEA
1 stop12h 30mLufthansa
vie. 1/93:10 pmSEA - BSL
1 stop15h 55mLufthansa
Deal found 10/30$658
This United Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/171:10 pmBSL - SEA
2 stops20h 40mUnited Airlines
vie. 1/97:30 pmSEA - BSL
3 stops39h 10mUnited Airlines
Deal found 10/30$659
This Lufthansa deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 11/138:15 pmBSL - SEA
1 stop26h 05mLufthansa
mar. 11/182:00 pmSEA - BSL
1 stop14h 35mLufthansa
Deal found 10/29$673
This Kiwi.com deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/186:05 amBSL - SEA
1 stop14h 45mAir France
vie. 1/97:10 amSEA - BSL
2 stops18h 05mAir France
Deal found 10/30$679
This United Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/171:10 pmBSL - SEA
2 stops20h 40mUnited Airlines
sáb. 12/2711:15 pmSEA - BSL
2 stops28h 15mUnited Airlines
Deal found 10/30$712
This KLM deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/186:05 amBSL - SEA
2 stops19h 16mKLM
vie. 1/97:10 amSEA - BSL
2 stops18h 30mKLM
Deal found 10/30$713
This Lufthansa deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/179:50 amBSL - SEA
1 stop12h 30mLufthansa
sáb. 12/277:00 amSEA - BSL
2 stops18h 05mLufthansa
Deal found 10/30$718

Cheap flight deals from Basel to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Basel (BSL) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated octubre 30, 2025.

Round-trip from

$566
(American Airlines)

Popular in

July

Cheapest in

November

Average price

$632
From Basel EuroAirport Swiss to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($100 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Basel to Seattle 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, Cheapflights users made 2,558,603 searches. Data last updated octubre 30, 2025.
Use the filters below to find and compare flights from Basel EuroAirport Swiss to Seattle that are best for you.

Fly from

Basel

Fly to

Seattle

Route

Depart

Return

Price

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

jue. 2/19

6:05 am-4:55 pm

1 stop19h 50m

Seattle/Tacoma Intl

lun. 3/2

6:00 am-6:15 pm

2 stops27h 15m

$566

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

jue. 2/19

6:05 am-4:55 pm

1 stop19h 50m

Seattle/Tacoma Intl

lun. 3/2

6:50 pm-6:15 pm

1 stop14h 25m

$567

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

jue. 11/13

6:05 am-11:18 pm

2 stops26h 13m

Seattle/Tacoma Intl

mar. 11/18

6:50 pm-10:20 pm

1 stop18h 30m

$596

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

jue. 11/13

6:05 am-11:45 am

1 stop14h 40m

Seattle/Tacoma Intl

mar. 11/18

1:40 pm-1:50 pm

1 stop15h 10m

$606

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

dom. 12/28

6:00 am-6:20 pm

2 stops45h 20m

$635

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

sáb. 12/27

7:10 am-11:30 am

1 stop13h 20m

$705

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

dom. 12/28

6:05 am-11:50 am

1 stop14h 45m

$894

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

dom. 12/28

9:50 am-1:20 pm

1 stop12h 30m

$1,516

BaselSeattle

BSL - SEA

BSLSEA

Basel EuroAirport Swiss

dom. 12/28

11:20 am-11:13 pm

2 stops20h 53m

$1,546

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Best time to book a flight from Basel to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Basel with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

Find useful and relevant information for your journey from Basel to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Basel EuroAirport Swiss to Seattle?

    Departing from Basel EuroAirport Swiss to Seattle will take you 19h 50m. Airlines will cover a distance of 5207 mi.

  • Can I find deals for flights from Basel to Seattle that include hotel bookings?

    Yes. In addition to deals on Basel to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Basel to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Basel to Seattle.

  • Can I find deals for business class flights from Basel to Seattle?

    Yes. Cheapflights offers flight deals from Basel to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tukwila
Tacoma
Lakewood
Olympia
Ocean Shores
Lynnwood
Edmonds
Leavenworth
Renton
Kirkland
Lacey
Kent
Federal Way
Cle Elum
Marysville
Puyallup
Chehalis
Fife
Issaquah

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