$508 Cheap Flights from Seattle (SEA) to Sao Luis (SLZ)

View $508 flight on Wed, Dec 3, 2025Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Sao Luis (SLZ-Marechal Cunha Machado Intl.)

Cheap Flights from Seattle to Sao Luis (SEA-SLZ)

Prices were available within the past 7 days and start at $508 for one-way flights and $620 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, Apr 12 - Thu, Apr 30
SEA
Seattle
SLZ
São Luís
$620 Roundtrip, found 18 hours ago
$620
Roundtrip
found 18 hours ago
Select United flight, departing Sun, Apr 12 from Seattle to São Luís, returning Thu, Apr 30, priced at $620 found 18 hours ago
United
Mon, Mar 30 - Tue, Apr 14
SEA
Seattle
SLZ
São Luís
$625 Roundtrip, found 6 days ago
$625
Roundtrip
found 6 days ago
Select United flight, departing Mon, Mar 30 from Seattle to São Luís, returning Tue, Apr 14, priced at $625 found 6 days ago
United
Fri, Oct 24 - Wed, Nov 12
SEA
Seattle
SLZ
São Luís
$665 Roundtrip, found 6 days ago
$665
Roundtrip
found 6 days ago
Select United flight, departing Fri, Oct 24 from Seattle to São Luís, returning Wed, Nov 12, priced at $665 found 6 days ago
United
Wed, Mar 4 - Thu, Mar 19
SEA
Seattle
SLZ
São Luís
$670 Roundtrip, found 6 days ago
$670
Roundtrip
found 6 days ago
Select United flight, departing Wed, Mar 4 from Seattle to São Luís, returning Thu, Mar 19, priced at $670 found 6 days ago
United
Wed, Mar 4 - Fri, Mar 20
SEA
Seattle
SLZ
São Luís
$675 Roundtrip, found 6 days ago
$675
Roundtrip
found 6 days ago
Select United flight, departing Wed, Mar 4 from Seattle to São Luís, returning Fri, Mar 20, priced at $675 found 6 days ago
United
Wed, Mar 25 - Wed, Apr 8
SEA
Seattle
SLZ
São Luís
$685 Roundtrip, found 6 days ago
$685
Roundtrip
found 6 days ago
Select United flight, departing Wed, Mar 25 from Seattle to São Luís, returning Wed, Apr 8, priced at $685 found 6 days ago
Alaska Airlines
Mon, Feb 9 - Wed, Feb 25
SEA
Seattle
SLZ
São Luís
$928 Roundtrip, found 6 days ago
$928
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Mon, Feb 9 from Seattle to São Luís, returning Wed, Feb 25, priced at $928 found 6 days ago
Delta
Sun, Feb 15 - Tue, Feb 24
SEA
Seattle
SLZ
São Luís
$975 Roundtrip, found 5 days ago
$975
Roundtrip
found 5 days ago
Select Delta flight, departing Sun, Feb 15 from Seattle to São Luís, returning Tue, Feb 24, priced at $975 found 5 days ago
LATAM Airlines Group
Thu, Nov 6 - Sun, Nov 9
SEA
Seattle
SLZ
São Luís
$1,005 Roundtrip, found 4 days ago
$1,005
Roundtrip
found 4 days ago
Select LATAM Airlines Group flight, departing Thu, Nov 6 from Seattle to São Luís, returning Sun, Nov 9, priced at $1,005 found 4 days ago
GOL Linhas Aereas S.A.
Mon, Feb 9 - Mon, Feb 16
SEA
Seattle
SLZ
São Luís
$1,440 Roundtrip, found 6 days ago
$1,440
Roundtrip
found 6 days ago
Select GOL Linhas Aereas S.A. flight, departing Mon, Feb 9 from Seattle to São Luís, returning Mon, Feb 16, priced at $1,440 found 6 days ago

Alternative airports near São Luís

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Marechal Cunha Machado Intl. SLZ. Cheapest and Closest option available. Average driving time to city center is 12 minutes. Flights from $975
SLZ
Marechal Cunha Machado Intl.
CheapestClosest
Average driving time to city center12 min
Flights from $975
Flights from Seattle (SEA) to Sao Luis (SLZ)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Marechal Cunha Machado Intl.
Airlines serving
Delta, GOL Linhas Aereas S.A., LATAM Airlines Group
Roundtrip price
$620
Distance
5795 mi

Seattle to Sao Luis Flights

The cheapest times to fly from Seattle to Sao Luis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to Sao Luis are during the month of April. You can find some of the cheapest flights from Seattle to Sao Luis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Sao Luis

Sunday is one of the best days to book for cheap flights from Seattle to Sao Luis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to Sao Luis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to Sao Luis in 2025. You can also book with separate airlines for your outbound and return journeys, from $508 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to Sao Luis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to Sao Luis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Marechal Cunha Machado Intl. Airport (SLZ) cost?
Secure a cheap one-way flight from $508 or cheap return flight from $620 from Seattle - Tacoma Intl. Airport (SEA) to Marechal Cunha Machado Intl. Airport (SLZ) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Marechal Cunha Machado Intl. Airport (SLZ)?
Planning your trip for April can help you save, as it's the cheapest month for flights between SEA and SLZ. You'll usually find the lowest fares during the off-season.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Marechal Cunha Machado Intl. Airport (SLZ)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest SEA to SLZ flight.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Marechal Cunha Machado Intl. Airport (SLZ)?
Nonstop flights from Seattle - Tacoma Intl. Airport (SEA) to Marechal Cunha Machado Intl. Airport (SLZ) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SEA to SLZ?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Marechal Cunha Machado Intl. Airport (SLZ)?
Opt for a flight from Seattle - Tacoma Intl. Airport (SEA) to Marechal Cunha Machado Intl. Airport (SLZ) that takes off before 3 PM to reduce the risk of cancellations. Departures later than this have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Marechal Cunha Machado Intl. Airport (SLZ) last-minute?
Waiting until right before your break to book a ticket from SEA to SLZ often results in higher prices. While you might find some last-minute deals, they're not always guaranteed. Be flexible with your travel plans to maximize your chances of landing a bargain.
Is it cheaper to book a SEA to SLZ flight and hotel package?
Compared with arranging flights and hotels separately, booking a SEA to SLZ flight and hotel package with Expedia could lead to significant savings. Better yet, managing everything in one place will take the stress out of planning your trip. Just pick your flights and choose from our extensive range of stays, then personalize your trip with other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Marechal Cunha Machado Intl. Airport (SLZ)?
In most instances, you can modify or cancel your SEA to SLZ flight. However, there may be additional charges, especially if you made your booking over 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you need more details, head to our Customer Service portal.

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*Available to One Key members.