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SEA - BSL

$489 Find cheap flights from Seattle to Basel

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 5/27. 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
Sun 6/16
Sun 6/23

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 42,211,976 times on KAYAK, and here is why:

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

 
These are the cheapest deals for flights from Seattle to Basel currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Seattle to Basel

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Seattle to Basel.

Recent one-way flight deals from Seattle to Basel

Only flying one-way? Below are some of the best one-way flight deals from Seattle to Basel found on KAYAK recently.

Recent last minute flight deals from Seattle to Basel

Leaving soon but still want a bargain? Check out these latest deals for last minute flights from Seattle to Basel.

Recent direct flight deals from Seattle to Basel

The latest deals for direct flights from Seattle to Basel so you can sit back and relax without the need for a layover.

Cheap bus & train deals from Seattle to Basel

Find recent round-trip train or bus tickets from Seattle to Basel.

All round-trip flight deals to Basel

The cheapest plane tickets to Basel found on KAYAK recently.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
7:40 pm - 10:55 pmSEA-BSL
18h 15m1 stop
6:35 am - 9:56 pmBSL-SEA
24h 21m2 stops
$641British Airways
Find Deal
Sun, Aug 4 - Thu, Aug 22
6:15 pm - 6:00 pmSEA-BSL
14h 45m1 stop
6:20 am - 10:15 amBSL-SEA
12h 55m1 stop
$654Air France
Find Deal
Sun, Aug 4 - Thu, Aug 22
6:15 pm - 6:00 pmSEA-BSL
14h 45m1 stop
10:55 am - 10:14 pmBSL-SEA
20h 19m2 stops
$662Delta
Find Deal
Sun, Aug 4 - Thu, Aug 22
12:55 pm - 5:40 pmSEA-BSL
43h 45m3 stops
1:05 pm - 9:53 amBSL-SEA
53h 48m2 stops
$669United Airlines
Find Deal
Sun, Sep 1 - Mon, Dec 2
10:50 pm - 10:40 amSEA-BSL
26h 50m2 stops
10:55 am - 12:00 pmBSL-SEA
34h 05m1 stop
$671United Airlines
Find Deal
Sun, Sep 1 - Mon, Dec 2
1:43 am - 6:20 pmSEA-BSL
31h 37m2 stops
3:40 pm - 11:25 amBSL-SEA
28h 45m1 stop
$694American Airlines
Find Deal
Tue, Nov 5 - Wed, Nov 13
7:40 am - 1:40 pmSEA-BSL
21h 00m2 stops
6:40 am - 6:26 pmBSL-SEA
20h 46m2 stops
$707Air Canada
Find Deal
Tue, Sep 3 - Fri, Sep 20
1:35 pm - 6:05 pmSEA-BSL
19h 30m1 stop
10:55 am - 5:35 pmBSL-SEA
15h 40m1 stop
$898Delta
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Wed, Jul 17 - Wed, Jul 24
12:18 am - 6:20 pmSEA-BSL
33h 02m2 stops
6:40 am - 11:35 amBSL-SEA
13h 55m1 stop
$1,442American Airlines
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Mon, Sep 2 - Fri, Sep 20
1:10 pm - 1:40 pmSEA-BSL
15h 30m2 stops
11:05 am - 6:26 pmBSL-SEA
16h 21m2 stops
$4,559Air Canada
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Fri, Sep 27 - Sat, Oct 12
8:40 am - 5:40 pmSEA-BSL
24h 00m2 stops
Mon, May 27
8:40 am - 8:35 amSEA-BSL
38h 55m3 stops
Mon, May 27
10:59 pm - 11:35 amSEA-BSL
51h 36m3 stops
Sun, May 26
11:00 am - 5:40 pmSEA-BSL
21h 40m2 stops
Sat, May 25
11:25 am - 4:35 pmSEA-BSL
44h 10m3 stops
Sat, May 25
11:25 am - 10:05 pmSEA-BSL
25h 40m2 stops
Sun, May 26
5:05 pm - 10:05 pmSEA-BSL
20h 00m1 stop
Mon, May 27
4:55 pm - 1:40 pmSEA-BSL
11h 45m1 stop
Sun, May 26
5:15 pm - 5:40 pmSEA-BSL
15h 25m1 stop
Sat, May 25
1:30 pm - 6:20 pmSEA-BSL
19h 50m2 stops
$1,047British Airways
Find Deal
Tue, Oct 22
2:15 pm - 5:40 pmSEA-BSL
18h 25m1 stop
6:40 am - 12:25 pmBSL-SEA
14h 45m1 stop
$1,177Lufthansa
Find Deal
Fri, May 17 - Fri, May 24
2:15 pm - 1:40 pmSEA-BSL
14h 25m1 stop
8:35 am - 6:27 pmBSL-SEA
18h 52m2 stops
$1,255Lufthansa
Find Deal
Fri, May 17 - Fri, May 24

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.

Good to know

Low season

February

High season

August

Cheapest flight

$489
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 $489 for a one-way ticket and $641 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?

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

  • Which is the best airline for flights from Seattle to Basel, Delta or British Airways?

    The two airlines most popular with KAYAK users for flights from Seattle to Basel are Delta and British Airways. With an average price for the route of $1,271 and an overall rating of 8.0, Delta is the most popular choice. British Airways is also a great choice for the route, with an average price of $1,120 and an overall rating of 6.8.

  • 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 10673 reviews
7.4Food
7.9Comfort
8.0Entertainment
8.6Crew
8.2Boarding
Airline reviews

The plane from SNA wouldn’t start after 5 tries. The team gave me an option of flying direct from LAX and giving me a Lyft ride there! Perfect!

10.0 ExcellentSash, May 2024SEA - HNL
Read more about Delta reviews

The plane from SNA wouldn’t start after 5 tries. The team gave me an option of flying direct from LAX and giving me a Lyft ride there! Perfect!

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.

- OK plane. Basic accommodations. OK food. The digital window shade wasn't working.

- OK plane. Basic accommodations. OK food. The digital window shade wasn't working. - Expect to be woken up more than an hour before landing when they start dinging the bell and making announcements and turning on all cabin lights to serve a snack. I would prefer they remain quiet and only serve people who want to wake up.

Better food and more space in the seats. Also when doing the web check in both times I was going in to your site the minute you open it and there is not really many seats to choose only to buy!!!

It was ok, not as good as it used to be. The Heathrow connection was a disaster - complete anarchy, unknowledgable and skimpy assistance and signage. Gate crew at next flight was great, held the flight while my wife struggled through security.

It was great! The seats were comfortable, and they fed me during the transatlantic flight, something which I have been missing out on for the past 3 years as I travel to and from school.

This flight was cancelled at the last minute. We were rebooked on another flight but a day later. We lost a day of our vacation and paid for a night in a hotel we couldn’t use. The flights we were rebooked on (both American) messed up our seating on both flights-we didn’t get the seats we had paid for. All in all, a terrible experience.

Lost our bags in Heathrow, We didn’t receive bags in Mallorca for 3 days, out of a 7 day cycling vacation. Really inconvenient and disappointing!

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.

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.
5/27Mon
2 stops
24h 00mSEA-BSL
$489
5/27Mon
3 stops
38h 55mSEA-BSL
$526
5/26Sun
3 stops
51h 36mSEA-BSL
$574
5/25Sat
2 stops
21h 40mSEA-BSL
$594
5/25Sat
3 stops
44h 10mSEA-BSL
$636
5/26Sun
2 stops
25h 40mSEA-BSL
$670
5/27Mon
1 stop
20h 00mSEA-BSL
$744
5/26Sun
1 stop
11h 45mSEA-BSL
$745
5/25Sat
1 stop
15h 25mSEA-BSL
$788
10/22Tue
2 stopsBritish Airways
19h 50mSEA-BSL
$1,047

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Last minute flights from Seattle to Basel

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Seattle to Basel that are departing in the next 10 days.
5/17Fri
multi-stopLufthansa
18h 25mSEA-BSL
5/24Fri
multi-stopLufthansa
14h 45mBSL-SEA
$1,177
5/17Fri
multi-stopLufthansa
14h 25mSEA-BSL
5/24Fri
multi-stopLufthansa
18h 52mBSL-SEA
$1,255

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Seattle - Basel Flights

Departure:

Seattle (undefined)United States

Destination:

Basel (BSL)Switzerland

Return flight deals:

Basel - Seattle

Cabin classes: