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SEA - BSL

Find cheap flights from Seattle to Basel from $522

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Basel departing on 7/3. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Wed 6/5
Wed 6/12

Search hundreds of travel sites at once for deals on flights to Basel

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Basel, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Basel, as well as popular online travel agencies
In the last 7 days travelers have searched 42,830,901 times on KAYAK, and here is why:

Save 22% or moreCompare multiple travel sites with one search.

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

Cheap flight deals from Seattle to Basel (SEA-BSL)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Basel that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
12:30 am - 12:55 pmSEA-BSL
27h 25m2 stops
2:05 pm - 1:23 amBSL-SEA
20h 18m2 stops
$699United Airlines
Find Deal
Sat, Aug 3 - Thu, Aug 22
12:30 am - 12:55 pmSEA-BSL
27h 25m2 stops
9:40 am - 11:34 amBSL-SEA
34h 54m2 stops
$801United Airlines
Find Deal
Sat, Aug 3 - Fri, Aug 23
11:25 am - 5:40 pmSEA-BSL
21h 15m2 stops
8:30 am - 6:59 pmBSL-SEA
19h 29m2 stops
Mon, Jun 3 - Mon, Jun 10
12:30 am - 12:55 pmSEA-BSL
27h 25m2 stops
6:40 am - 12:15 pmBSL-SEA
14h 35m1 stop
$888United Airlines
Find Deal
Sat, Aug 3 - Thu, Aug 22
1:10 pm - 1:40 pmSEA-BSL
15h 30m2 stops
1:30 pm - 10:20 pmBSL-SEA
17h 50m2 stops
$905Lufthansa
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Wed, Jul 17 - Wed, Jul 24
10:40 am - 1:40 pmSEA-BSL
18h 00m2 stops
8:30 am - 12:15 pmBSL-SEA
12h 45m1 stop
$919Lufthansa
Find Deal
Wed, Jul 17 - Wed, Jul 24
10:40 am - 5:40 pmSEA-BSL
22h 00m2 stops
9:40 am - 10:20 pmBSL-SEA
21h 40m2 stops
$956Lufthansa
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Thu, Jul 18 - Thu, Jul 25
1:30 pm - 10:55 pmSEA-BSL
24h 25m1 stop
6:35 am - 9:58 pmBSL-SEA
24h 23m2 stops
$958British Airways
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Thu, Jul 18 - Thu, Jul 25
5:05 pm - 5:40 pmSEA-BSL
15h 35m1 stop
8:30 am - 10:07 pmBSL-SEA
22h 37m2 stops
Mon, Jun 3 - Mon, Jun 10
1:35 pm - 6:05 pmSEA-BSL
19h 30m1 stop
10:55 am - 11:20 amBSL-SEA
33h 25m1 stop
$1,180Air France
Find Deal
Thu, Jul 18 - Thu, Jul 25

Flights from Seattle to Basel - Travel Insights & Trends

Get data-powered insights and trends into flights from Seattle to Basel to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Seattle to Basel?

The average price of all flights from Seattle to Basel EuroAirport Swiss clicked on KAYAK for each day over the last 12 months.
If you are looking for a flight deal from Seattle to Basel, look for departures on Mondays and avoid leaving on a Friday, as it's usually the priciest day. When flying back from Basel, Tuesday is the cheapest day to fly and Saturday is the most expensive.

Which airlines provide the cheapest flights from Seattle to Basel?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
The cheapest return flight ticket from Seattle to Basel found by KAYAK users in the last 72 hours was for $699 on United Airlines, followed by Lufthansa ($905). One-way flight deals have also been found from as low as $1,026 on United Airlines and from $2,935 on American Airlines.

Good to know

Low season

February

High season

August

Cheapest flight

$522
Best time to beat the crowds with an average 38% drop in price.
Most popular time to fly and prices are also 15% lower on average.
Flight from Seattle to Basel

When to book flights from Seattle to Basel

Are your dates flexible? Find out the best times to travel from Seattle to Basel based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Seattle to Basel flights

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

    In the last 3 days, the lowest price for a flight from Seattle to Basel EuroAirport Swiss was $522 for a one-way ticket and $699 for a round-trip.

  • Do I need a passport to fly between Seattle and Basel?

    Yes, you’ll need a passport to travel to Basel from Seattle.

  • Which aircraft models fly most regularly from Seattle to Basel?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Seattle to Basel?

    Star Alliance, oneworld, and SkyTeam are the airline alliances operating flights between Seattle and Basel, with oneworld being the most commonly used for this route.

  • How does KAYAK find such low prices on flights from Seattle to Basel?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Basel.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Basel?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Basel from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Basel?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Basel with an airline and back to Seattle with another airline. Booking your flights between Seattle and BSL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Basel?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Basel from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top airlines flying from Seattle to Basel

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Basel. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Basel? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 10826 reviews
7.9Comfort
8.0Entertainment
8.2Boarding
7.4Food
8.6Crew
Airline reviews

Had a broken tray in business class. Crew just shrugged it off.

2.0 MediocreShiva, Apr 2024SEA - SFO
Read more about Delta reviews

Had a broken tray in business class. Crew just shrugged it off.

Everything was great except for the seat. The backrest would not stay in the upright position.

public website still broken for years randomly blocking browsers with privacy options active after loading a page maybe once. check-in on laptop was almost impossible but eventually randomly worked. had to print pass at airport since couldn't get back in to load digital pass on mobile firefox or chrome. red eye flight so smooth onboarding, plenty of room to spread out, easy offboarding. onboard wifi instructions mention vpn can cause problems connecting but fails to also mention private dns. no printed or built in menu list, seems weird to require personal device to point at qr code link for menu which does not even allow direct ordering. people with health condition risk related dietary restrictions trying to avoid for example cholesterol and sugar are left guessing what they can order either way without nutritional info highlights (cranberry juice was minute maid cocktail with as much suger as typical can of soda). tap to pay wasn't working and always seems sketchy to manually enter card info. good movie variety, so limited tv was okay.

Bag drop off was slow and annoying. Only 2 agents at the entire delta desk, and no one directing traffic for what line to be in, many confused people slowed down the process. Boarding was fine. Seats in Delta comfort plus were fine. Snacks were great! Definitely a bonus. The entertainment system was awful — old, slow, not responsive, and completely unable to play games due to some kind of error. But on the other hand, thank you to Delta for the free WiFi. That made it better.

Flight diverted in SD. Later take off in Seattle by 1.3hrs

Mi primera conexión se retrasó por lo cual perdí mi segunda conexión la cual salió adelantada

Crew was not friendly when I went to request a seat change.

There were choices for the snacks. Good choices and tasty lunch and breakfast as well.

The flight crew was amazing. I’m very tall and they moved me to an exit row unsolicited!!! Amazing service.

The boarding process was terrible especially with an indirect flight Chicago to Seattle to San Diego was terrible talking about we overbooked a flight idk if I’d take this airline ever again we got off our flight from Chicago to Seattle and we traveled for business and they told us our connecting flight was over booked and their was no seats asking people to take a delayed next flight and they don’t tell anyone coughing to wear masks seats 30A-B were terrible during the flight no one wants to sit next to people coughing all around I don’t want to be sick traveling for work or get sick anytime it’s very upsetting the staff doesn’t take this stuff serious to tell them to wear masks when they see people coughing and sneezing

My luggage never arrived to Zurich. They can't confirm when it will arrive

We missed the flight to Barcelona because the flight from Baltimore was delayed. We flew on Vueling VW6653. Our luggage didn’t arrive. Please help us get our luggage. We are staying at Hotel Gran Via in Barcelona

The seats were tiny, being of a fairly petite build, I don’t usually expect to feel crammed and cramped in a seat, but I definitely was on this flight. I couldn’t even bend over to get anything out from under the seat in front and getting up to go to the bathroom at night with the seat backs reclined was nearly impossible. I had to do gymnastics to get over and out. For an airline that does long flights overnight, it’s kind of ridiculous.

Not connecting flights. Missed my flight from Dublin to Liverpool because I arrived at Dublin one hour too late. For this mistake, they offered me a flight from Dublin to Manchester. Thats great and all, but I waste time and money to commute to Liverpool. Be sure to check the time of your connecting flights, because they sure don’t when they sell it to you

Excellent! Great flight attendants, good food (in business class, at least), very comfortable. Touchscreen and remote wasn’t great.

In economy and food was ok, but with limited leg space (and I was in a 2 seat configuration) it was difficult to eat with a tiny seat tray. I spilt wine on my trousers. First time on British Air (I usually fly Turkish Air) and in a 777. Heathrow was pleasant but changing terminals awkward.

Starting with the flight Cairo to London the plain was so poor no entertainment at all uncomfortable seats although it’s 5 hours long,then an American airline plain took me from London to Miami it was a bad experience the crew most of flight time not available and they asked us to help our selves for any snacks if we need. From Miami to London actually was perfect flight with a huge plain and perfect crew but from London to Cairo was horrible plain with stiff fixed seats not movable no entertainment or wi fi very poor Menu which is unacceptable for a business class

I've done hundreds of flights in my life, and this flight was one of the best I've ever taken, From beginning to end, everything went smoothly, professionally, and with a smile and friendly attitude from all employees I interacted with. The food was delicious (and free), as were the drinks. There was just a genial and effective way in the way that British Airways organized the flight -that reminded of days in the 70's, 80's, and 90's, when flying was a fun, and exciting adventure. I enjoyed and had confidence in the abilities of the flight crew, I'll be flying British Airways several more times this summer. Thank you so much for the great experience! Cheryl Olso

My baggage did not arrived with me. Took 3 days to get it after so may calls and follow up

Terrible! I missed my flight to my final destination and British airlines and American Airlines keep pointing fingers on each other’s. Nobody wants to take responsibility

Book cheap flights from Seattle to Basel

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Seattle to Basel found on KAYAK in the last 72 hours.
7/3Wed
3 stops
49h 45mSEA-BSL
$522
5/22Wed
3 stops
42h 06mSEA-BSL
$636
7/3Wed
2 stops
38h 00mSEA-BSL
$653
5/22Wed
1 stop
19h 45mSEA-BSL
$693
5/22Wed
2 stops
36h 20mSEA-BSL
$706
7/3Wed
1 stop
19h 40mSEA-BSL
$989
7/2Tue
2 stopsUnited Airlines
23h 35mSEA-BSL
$1,026
5/21Tue
2 stopsAmerican Airlines
25h 05mSEA-BSL
$2,935

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Seattle - Basel Flights

Departure:

Seattle (SEA)United States

Destination:

Basel (BSL)Switzerland

Return flight deals:

Basel - Seattle

Cabin classes: