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$350+ Cheap flights from Seattle (SEA) to Basel EuroAirport Swiss (BSL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BSL
Jan 22 — Jan 291
Wed 1/22
Wed 1/29
1 adult, Economy
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Cheap flight deals from Seattle to Basel

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Basel (BSL). 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 January 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$502
(Booking.com)

Popular in

June

Cheapest in

November

Average price

$573
Provider with most accurate pricing for Seattle/Tacoma Intl-Basel EuroAirport Swiss flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Basel EuroAirport Swiss flights.
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From Seattle/Tacoma Intl to Basel EuroAirport Swiss
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High demand for flights, 17% potential price rise
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Best time to find cheap flights, 3% potential price drop
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Average for round-trip flights in January 2025
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Find flight deals from Seattle to Basel

Cheapest flights from Seattle to Basel
Explore the most affordable flight options available from Seattle to Basel. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 17, 2025.

This Booking.com deal was found by Cheapflights users on 1/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/171:33 pmSEA - BSL
2 stops19h 37mBritish Airways
Mon 2/248:00 pmBSL - SEA
1 stop24h 20mBritish Airways
Deal found 1/15$502
This American Airlines deal was found by Cheapflights users on 1/15. 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.
Mon 2/171:33 pmSEA - BSL
2 stops19h 37mAmerican Airlines
Mon 2/243:50 pmBSL - SEA
1 stop28h 30mAmerican Airlines
Deal found 1/15$509
This Gotogate deal was found by Cheapflights users on 1/16. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/25:45 amSEA - BSL
2 stops28h 45mMultiple Airlines
Sun 3/96:50 amBSL - SEA
2 stops23h 10mMultiple Airlines
Deal found 1/16$516
This Gotogate deal was found by Cheapflights users on 1/15. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/173:05 pmSEA - BSL
2 stops37h 20mAir Canada
Mon 2/242:10 pmBSL - SEA
2 stops52h 47mAir Canada
Deal found 1/15$532
This United Airlines deal was found by Cheapflights users on 1/16. 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.
Sun 10/264:10 pmSEA - BSL
1 stop12h 15mUnited Airlines
Thu 11/62:15 pmBSL - SEA
2 stops29h 25mUnited Airlines
Deal found 1/16$541
This Lufthansa deal was found by Cheapflights users on 1/16. 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.
Sun 10/264:10 pmSEA - BSL
1 stop12h 15mLufthansa
Tue 11/49:35 amBSL - SEA
1 stop12h 45mLufthansa
Deal found 1/16$547
This Delta deal was found by Cheapflights users on 1/16. 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.
Tue 10/2811:45 amSEA - BSL
2 stops18h 20mDelta
Tue 11/410:15 amBSL - SEA
2 stops20h 55mDelta
Deal found 1/16$563
This KLM deal was found by Cheapflights users on 1/16. 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.
Fri 5/25:35 pmSEA - BSL
1 stop15h 15mKLM
Wed 5/76:15 amBSL - SEA
1 stop18h 40mKLM
Deal found 1/16$668
This oojo deal was found by Cheapflights users on 1/16. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/157:00 pmSEA - BSL
1 stop37h 10mTurkish Airlines
Sat 2/2211:00 amBSL - SEA
1 stop39h 05mTurkish Airlines
Deal found 1/16$973

Find flights from Seattle to Basel within your budget

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, Cheapflights users made 2,558,603 searches. Data last updated January 17, 2025.

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Fly to

Any airport

Route

Depart

Return

Price

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 3/3

6:50 pm-6:10 pm

1 stop14h 20m

Basel EuroAirport Swiss

Mon 3/10

8:00 pm-12:20 pm

1 stop24h 20m

$501

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 3/3

1:33 pm-6:10 pm

2 stops19h 37m

Basel EuroAirport Swiss

Mon 3/10

10:55 am-12:20 pm

1 stop33h 25m

$507

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 3/3

10:35 am-1:30 pm

2 stops17h 55m

Basel EuroAirport Swiss

Mon 3/10

10:55 am-10:00 pm

2 stops43h 05m

$513

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sun 3/2

5:45 am-7:30 pm

2 stops28h 45m

Basel EuroAirport Swiss

Sun 3/9

6:50 am-9:00 pm

2 stops23h 10m

$516

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 3/3

8:10 am-4:20 pm

2 stops23h 10m

Basel EuroAirport Swiss

Mon 3/10

1:05 pm-2:20 pm

1 stop33h 15m

$560

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Tue 5/20

6:35 pm-9:30 am

1 stop29h 55m

Basel EuroAirport Swiss

Wed 6/11

10:10 am-5:35 pm

1 stop16h 25m

$595

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 5/2

5:35 pm-5:50 pm

1 stop15h 15m

Basel EuroAirport Swiss

Wed 5/7

6:15 am-3:55 pm

1 stop18h 40m

$668

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Fri 5/2

2:20 pm-5:50 pm

1 stop18h 30m

Basel EuroAirport Swiss

Wed 5/7

6:20 am-2:13 pm

2 stops16h 53m

$688

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Mon 3/3

7:05 am-7:45 pm

2 stops27h 40m

Basel EuroAirport Swiss

Mon 3/10

8:25 pm-8:24 pm

2 stops31h 59m

$751

SeattleBasel

SEA - BSL

SEABSL

Seattle/Tacoma Intl

Sat 2/15

7:00 pm-5:10 pm

1 stop37h 10m

Basel EuroAirport Swiss

Sat 2/22

11:00 am-5:05 pm

1 stop39h 05m

$973

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/15

Showing 1-10 of 15 results
1
2
  • Most accurate provider: When it comes to deals on Seattle-Basel EuroAirport Swiss flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Seattle-Basel EuroAirport Swiss flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from Seattle-Basel EuroAirport Swiss flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Basel EuroAirport Swiss flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Basel EuroAirport Swiss flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Basel

Have a flexible travel schedule? Discover the best time to fly to Basel from Seattle 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.

Travel insights for flights from Seattle to Basel

Get recent, data-driven insights about flights from Seattle to Basel including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Seattle to Basel EuroAirport Swiss?

Currently, January is the cheapest month in which you can book a flight from Seattle to Basel EuroAirport Swiss (average of $545). Flying from Seattle to Basel EuroAirport Swiss in June is currently the most expensive (average of $1,132). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to BSL?

Find hourly flight availability from Seattle to Basel. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 17, 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to Basel EuroAirport Swiss in the evening. If you’re flexible enough to do this you can expect to save up to 24% on your trip compared to booking a flight in the afternoon.

Rainfall in Basel by month

Plan your trip to Basel by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Basel EuroAirport Swiss ranges from 1.9 - 3.4 inches per month. June is typically the wettest month, when rainfall can reach 3.4 in. February is typically the driest time to visit Basel EuroAirport Swiss when rainfall is around 1.9 in.

Temperature in Basel by month

Plan your trip to Basel by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Basel EuroAirport Swiss, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

Reviews of airlines servicing Basel

Get insights into the airlines that provide service to Basel. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Basel. Reviews last updated January 17, 2025.
Delta
8.0
Very good
8,511 reviews

Entertainment

7.9

Overall

8.0

Crew

8.6

Comfort

8.0

Boarding

8.2

Food

7.3

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta
8.0
Very good
8,511 reviews
Delta
8.0
Very good
8,511 reviews

Entertainment

7.9

Overall

8.0

Crew

8.6

Comfort

8.0

Boarding

8.2

Food

7.3

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Austrian Airlines
7.6
Good
786 reviews
Delta
8.0
Very good
8,511 reviews

Entertainment

7.9

Overall

8.0

Crew

8.6

Comfort

8.0

Boarding

8.2

Food

7.3

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

United Airlines
7.4
Good
8,964 reviews
Delta
8.0
Very good
8,511 reviews

Entertainment

7.9

Overall

8.0

Crew

8.6

Comfort

8.0

Boarding

8.2

Food

7.3

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Turkish Airlines
7.3
Good
3,921 reviews
Delta
8.0
Very good
8,511 reviews

Entertainment

7.9

Overall

8.0

Crew

8.6

Comfort

8.0

Boarding

8.2

Food

7.3

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
8,511 reviews

Entertainment

7.9

Overall

8.0

Crew

8.6

Comfort

8.0

Boarding

8.2

Food

7.3

Reviews

1 / 10

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

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

  • What are the cheapest airlines flying from Seattle to Basel EuroAirport Swiss round-trip?

    British Airways, at $502, was found to be the cheapest airline from Seattle to Basel EuroAirport Swiss.Alternate airlines to your destination round-trip include American Airlines and Air Canada. You may be able to fly from Seattle to Basel EuroAirport Swiss for 32% less than the average price by searching for these airlines.

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

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

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

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

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

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

  • What is the cheapest month to book a flight from Seattle to Basel EuroAirport Swiss?

    Currently, January is the cheapest month in which you can book a flight from Seattle to Basel EuroAirport Swiss (average of $545). Flying from Seattle to Basel EuroAirport Swiss in June is currently the most expensive (average of $1,132). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Seattle to Basel

See prices for flight routes from nearby airports that may be better suited for you.
Portland to Basel flights

Top 2 airlines flying from Seattle to Basel

Discover the top 2 airlines that operate flights from Seattle to Basel. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$443Average$624FlexibilityNo cancel feeOn-time70%
Air FranceCheapest$502Average$769FlexibilityNo cancel feeOn-time77%
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