Cheap flights from Seattle to Basel from $320
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Basel departing on 9/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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American Airlines flights from Seattle to Basel EuroAirport Swiss
Our best American Airlines deals on Seattle to Basel EuroAirport Swiss flight tickets
KLM flights from Seattle to Basel EuroAirport Swiss
Our best KLM deals on Seattle to Basel EuroAirport Swiss flight tickets
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How to get the cheapest flight ticket from Seattle to Basel EuroAirport Swiss
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Basel EuroAirport Swiss?
If you are unable to visit Basel EuroAirport Swiss during the month of November, then departing from Seattle during the month January is also very affordable. Most momondo users find prices during this month for around $573.
What is the cheapest day to depart on your flight to Basel EuroAirport Swiss?
According to our data, Wednesday is the cheapest day to fly to Basel EuroAirport Swiss from Seattle. The lowest ticket price found for a Wednesday departure recently was $590. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Flights from Seattle to Basel EuroAirport Swiss on a Friday will generally be more expensive and average around $1,201. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.
What is the cheapest time of day to depart on your flight to Basel EuroAirport Swiss?
According to our data, the cheapest time of day to fly to Basel EuroAirport Swiss is in the evening. momondo users have found flights departing from Seattle to Basel EuroAirport Swiss in the evening for as low as $590. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Try not to purchase tickets in the afternoon because they tend to be around $767. Of course, these prices can vary depending on the time of year and what airport you fly to.
Can stopping save me money on Seattle to Basel EuroAirport Swiss flights?
You could potentially save up to 15% on your flight if you consider stops on a Seattle to Basel EuroAirport Swiss flight.
What is the cheapest airline that flies from Seattle/Tacoma Intl to Basel EuroAirport Swiss?
Delta, United Airlines, and British Airways are the most popular carriers operating from Seattle/Tacoma Intl to Basel EuroAirport Swiss
What airlines fly to Basel EuroAirport Swiss?
British Airways, Lufthansa and Delta are the top three most popular airlines that fly to Basel EuroAirport Swiss from Seattle according to our data. British Airways is the first choice among our users, with 44% of people opting to fly with this airline when traveling to Basel EuroAirport Swiss. Keep in mind that there are 3 different airlines that fly to Basel EuroAirport Swiss on a routine basis, so you have a few additional options to choose from.
When to book flights from Seattle to Basel EuroAirport Swiss
Cheap Seattle to Basel EuroAirport Swiss (SEA to BSL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Seattle to Basel EuroAirport Swiss
How far is Seattle/Tacoma Intl to Basel EuroAirport Swiss by plane?
Seattle/Tacoma Intl and Basel EuroAirport Swiss are 5198.6 mi apart from one another. A reasonable flight in good conditions will take 11h 35m.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Basel EuroAirport Swiss?
Prices for flights from Seattle/Tacoma Intl Airport to Basel EuroAirport Swiss refresh daily.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Basel EuroAirport Swiss?
As of June 2025, there are 3 operators available to choose from for flights from Seattle/Tacoma Intl Airport to Basel EuroAirport Swiss.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Basel EuroAirport Swiss?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Seattle/Tacoma Intl Airport to Basel EuroAirport Swiss.
What documentation or ID do you need to fly to Basel EuroAirport Swiss?
The travel and health documents required for your trip to Basel EuroAirport Swiss can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Basel EuroAirport Swiss. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Seattle to Basel EuroAirport Swiss?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Seattle to Basel EuroAirport Swiss is British Airways (44% of total bookings). The next most popular airlines are Lufthansa (29%) and Delta (27%).
Best airlines flying from Seattle to Basel EuroAirport Swiss
Compare and see reviews for airlines that fly from Seattle to Basel EuroAirport Swiss with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $443 | Free Cancellation | Rating 6.6 7,008 reviews | |||
| PriceFrom $513 | Free Cancellation | Rating 8.0 7,946 reviews | |||
| PriceFrom $571 | Free Cancellation | Rating 6.7 7,139 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from Seattle to Basel?
Finding the right flight to Basel from Seattle is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Basel quick and easy, saving you time and money.
Can I find flights from Seattle to Basel with flexible booking policies on momondo?
Flights from Seattle to Basel with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.
How can momondo help me find flights from Seattle to Basel?
Once all potential Seattle to Basel flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from Seattle to Basel right now. Can momondo alert me if prices change?
If you are simply researching potential flights to Basel, momondo offers a useful price alert feature which will track prices for flights to Basel from Seattle and alert you when they change.