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Flights from Seattle to Basel

Find flight deals from Seattle to Basel for the next 3 months. Book one way flights from $461 or round trip flights from $837.

      • SEA 2:10 PM
        14h 30m
        1 stop
        BSL 1:40 PM
        Seattle - Basel | Mon, Aug 24 | United Airlines
        BSL 6:00 AM
        14h 55m
        1 stop
        SEA 11:55 AM
        Basel - Seattle | Mon, Aug 31 | United Airlines
        $837 $1,032
        19% off
        19% off
        $1,032 $837
      • SEA 1:30 PM
        15h
        1 stop
        BSL 1:30 PM
        Seattle - Basel | Mon, Aug 24 | Air France
        BSL 10:15 AM
        15h 12m
        1 stop
        SEA 4:27 PM
        Basel - Seattle | Mon, Aug 31 | Air France
        $852 $1,032
        17% off
        17% off
        $1,032 $852
      • SEA 1:30 PM
        15h
        1 stop
        BSL 1:30 PM
        Seattle - Basel | Mon, Aug 24 | KLM
        BSL 6:30 PM
        26h 7m
        1 stop
        SEA 11:37 AM
        Basel - Seattle | Mon, Aug 31 | KLM
        $852 $1,032
        17% off
        17% off
        $1,032 $852
      • SEA 5:45 PM
        15h 10m
        1 stop
        BSL 5:55 PM
        Seattle - Basel | Mon, Aug 24 | Virgin Atlantic
        BSL 6:30 AM
        18h 57m
        1 stop
        SEA 4:27 PM
        Basel - Seattle | Mon, Aug 31 | Delta Air Lines
        $858
        17% off
        $1,032 $858
      • SEA 6:50 PM
        15h 50m
        1 stop
        BSL 7:40 PM
        Seattle - Basel | Wed, Sep 9 | Lufthansa
        BSL 6:05 AM
        14h 50m
        1 stop
        SEA 11:55 AM
        Basel - Seattle | Wed, Sep 16 | United Airlines
        $892
        14% off
        $1,032 $892
      • SEA 6:50 PM
        15h 45m
        1 stop
        BSL 7:35 PM
        Seattle - Basel | Wed, Aug 12 | Lufthansa
        BSL 2:30 PM
        30h 25m
        1 stop
        SEA 11:55 AM
        Basel - Seattle | Tue, Aug 18 | United Airlines
        $902
        13% off
        $1,032 $902
      • SEA 2:10 PM
        14h 55m
        1 stop
        BSL 2:05 PM
        Seattle - Basel | Wed, Sep 9 | United Airlines
        BSL 6:05 AM
        14h 50m
        1 stop
        SEA 11:55 AM
        Basel - Seattle | Wed, Sep 16 | Swiss Airlines
        $904
        12% off
        $1,032 $904
      • SEA 2:10 PM
        14h 30m
        1 stop
        BSL 1:40 PM
        Seattle - Basel | Mon, Aug 31 | United Airlines
        BSL 8:15 PM
        29h 44m
        1 stop
        SEA 4:59 PM
        Basel - Seattle | Tue, Sep 8 | Swiss Airlines
        $919
        11% off
        $1,032 $919
      • SEA 6:50 PM
        29h 25m
        1 stop
        BSL 9:15 AM
        Seattle - Basel | Mon, Aug 24 | Lufthansa
        BSL 6:00 AM
        14h 55m
        1 stop
        SEA 11:55 AM
        Basel - Seattle | Mon, Aug 31 | Lufthansa
        $934
        9% off
        $1,032 $934
      • SEA 6:50 PM
        15h 45m
        1 stop
        BSL 7:35 PM
        Seattle - Basel | Wed, Jul 22 | Lufthansa
        BSL 8:15 PM
        29h 44m
        1 stop
        SEA 4:59 PM
        Basel - Seattle | Tue, Jul 28 | Lufthansa
        $939
        9% off
        $1,032 $939
      • SEA 1:00 PM
        17h 25m
        1 stop
        EAP 2:00 PM
        Seattle - Basel | Fri, Jul 17 | Normal Airline
        EAP 3:00 PM
        6h
        Nonstop
        SEA 4:00 PM
        Basel - Seattle | Sun, Jul 19 | Normal Airline
        Find more flights
        Find more flights
      • SEA 6:50 PM
        15h 45m
        1 stop
        BSL 7:35 PM
        Seattle - Basel | Tue, Aug 4 | Lufthansa
        $461 $553
        17% off
        17% off
        $553 $461
      • SEA 6:40 PM
        30h 15m
        1 stop
        BSL 9:55 AM
        Seattle - Basel | Wed, Aug 5 | Air France
        $487 $553
        12% off
        12% off
        $553 $487
      • SEA 6:50 PM
        15h 45m
        1 stop
        BSL 7:35 PM
        Seattle - Basel | Wed, Jul 22 | Lufthansa
        $492 $553
        11% off
        11% off
        $553 $492
      • SEA 2:10 PM
        14h 30m
        1 stop
        BSL 1:40 PM
        Seattle - Basel | Wed, Aug 19 | United Airlines
        $492
        11% off
        $553 $492
      • SEA 6:50 PM
        15h 45m
        1 stop
        BSL 7:35 PM
        Seattle - Basel | Wed, Aug 19 | Lufthansa
        $492
        11% off
        $553 $492
      • SEA 2:10 PM
        14h 55m
        1 stop
        BSL 2:05 PM
        Seattle - Basel | Tue, Aug 4 | United Airlines
        $492
        11% off
        $553 $492
      • SEA 2:10 PM
        14h 30m
        1 stop
        BSL 1:40 PM
        Seattle - Basel | Wed, Jul 22 | United Airlines
        $494
        11% off
        $553 $494
      • SEA 5:40 PM
        31h 5m
        1 stop
        BSL 9:45 AM
        Seattle - Basel | Wed, Jul 22 | Virgin Atlantic
        $499
        10% off
        $553 $499
      • SEA 2:10 PM
        14h 30m
        1 stop
        BSL 1:40 PM
        Seattle - Basel | Sun, Aug 23 | United Airlines
        $501
        9% off
        $553 $501
      • SEA 6:40 PM
        30h 15m
        1 stop
        BSL 9:55 AM
        Seattle - Basel | Sun, Aug 23 | Air France
        $503
        9% off
        $553 $503
      • SEA 1:00 PM
        17h 25m
        1 stop
        EAP 2:00 PM
        Seattle - Basel | Fri, Jul 17 | Normal Airline
        Find more flights
        Find more flights

Find cheap airlines flights from Seattle to Basel

You can choose from 1 airlines that fly from Seattle to Basel, including United Airlines, Lufthansa has lowest fares on this route.
United Airlines logo United Airlines
Airlines are determined based on actual purchased flight tickets from Seattle to Basel according to previous 12 months data from Trip.com.

Flight Info | Seattle to Basel

The distance between Seattle and Basel is approximately 8,384.78 km. Based on Trip.com's data travel demand peaks in January. The off-season for travel is July.

Cheapest one-way flight price$461
Cheapest round-trip ticket price$837
Off-season for travelJuly
Peak season for travelJanuary
Flight distance8,384.78 km
Popular airlineUnited Airlines
Flight statistics for the Seattle–Basel route are based on aggregated booking data from Trip.com over the past 12 months.

Frequently Asked Questions

  • What are the cheapest flights from Seattle to Basel (SEA-EAP)?

    Based on Trip.com data, Lufthansa offers one-way fares as low as $461 on Cheapest nonstop routes (e.g. SEA to BSL on Tue, Aug 4), while United Airlines offers Cheapest nonstop round-trips from $837 departing on Mon, Aug 24 and returning on Mon, Aug 31.
  • At the moment, several airlines serve connecting flights from Seattle to Basel, including: United Airlines Selected airlines are based on historical data collected from flight bookings made by users on Trip.com within the last 90 days.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Seattle to Basel is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • To find best deals on flights from Seattle to Basel, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Tue, Aug 4, with one-way flights priced at just $461.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Lufthansa.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Basel travel is around January.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Seattle to Basel is July, when demand for travel is lower.
  • After crunching the numbers on our July flight calendar, it's currently cheapest to fly from Seattle to Basel on July 21, 2026 with Lufthansa, with prices starting at $942.
  • You can land at any one of the following hubs in Basel, with Seattle-Tacoma International Airport to EuroAirport Swiss Basel Mulhouse Freiburg (SEA-BSL) is by far the most common option on this route: EuroAirport Swiss Basel Mulhouse Freiburg (BSL) EuroAirport Basel Mulhouse Freiburg (MLH).
  • The time difference between Basel and Seattle is 9h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

Explore More Popular Flights

Note: Prices shown on this page are estimated lowest price and include all taxes and fees found in the last 24 hours.

Book with no extra fees

Prices displayed in this page are all-inclusive prices (incl. taxes, fuel surcharge, civil aviation development fund, etc) with all fees confirmed before payment. Fees for luggage, meals, WLAN, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page were updated within last 24 hours—even in real-time. The more popular the route, the more precise the data.

Change & Cancellation Policy

Trip.com displays flight cancellation and change policies for each flight ticket during the booking process, including fees and applicable conditions. Please check the following scenarios:
Voluntary cancellation/change:
To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy.
Cancellation/change due to a flight schedule change:
If the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.