$496 Cheap Flights from Baltimore (BWI) to Sao Luis (SLZ)

View $496 flight on Mon, Aug 18, 2025Opens in a new window

Popular airlines from Baltimore Washington Intl. Airport (BWI) to Sao Luis (SLZ-Marechal Cunha Machado Intl.)

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Cheap Flights from Baltimore to Sao Luis (BWI-SLZ)

Prices were available within the past 7 days and start at $496 for one-way flights and $953 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sun, Aug 17 - Fri, Aug 29
BWI
Baltimore
SLZ
São Luís
$953 Roundtrip, found 19 hours ago
$953
Roundtrip
found 19 hours ago
Select Delta flight, departing Sun, Aug 17 from Baltimore to São Luís, returning Fri, Aug 29, priced at $953 found 19 hours ago
LATAM Airlines Group
Wed, Nov 26 - Sun, Nov 30
BWI
Baltimore
SLZ
São Luís
$1,057 Roundtrip, found 12 hours ago
$1,057
Roundtrip
found 12 hours ago
Select LATAM Airlines Group flight, departing Wed, Nov 26 from Baltimore to São Luís, returning Sun, Nov 30, priced at $1,057 found 12 hours ago
Delta
Sun, Aug 17 - Mon, Sep 1
BWI
Baltimore
SLZ
São Luís
$1,073 Roundtrip, found 19 hours ago
$1,073
Roundtrip
found 19 hours ago
Select Delta flight, departing Sun, Aug 17 from Baltimore to São Luís, returning Mon, Sep 1, priced at $1,073 found 19 hours ago
LATAM Airlines Group
Wed, Nov 26 - Sun, Nov 30
BWI
Baltimore
SLZ
São Luís
$1,169 Roundtrip, found 12 hours ago
$1,169
Roundtrip
found 12 hours ago
Select LATAM Airlines Group flight, departing Wed, Nov 26 from Baltimore to São Luís, returning Sun, Nov 30, priced at $1,169 found 12 hours ago
Delta
Sun, Aug 17 - Sun, Aug 24
BWI
Baltimore
SLZ
São Luís
$1,193 Roundtrip, found 19 hours ago
$1,193
Roundtrip
found 19 hours ago
Select Delta flight, departing Sun, Aug 17 from Baltimore to São Luís, returning Sun, Aug 24, priced at $1,193 found 19 hours ago
LATAM Airlines Group
Wed, Nov 26 - Sun, Nov 30
BWI
Baltimore
SLZ
São Luís
$1,207 Roundtrip, found 12 hours ago
$1,207
Roundtrip
found 12 hours ago
Select LATAM Airlines Group flight, departing Wed, Nov 26 from Baltimore to São Luís, returning Sun, Nov 30, priced at $1,207 found 12 hours ago
Delta
Sun, Jul 27 - Tue, Aug 12
BWI
Baltimore
SLZ
São Luís
$1,235 Roundtrip, found 3 days ago
$1,235
Roundtrip
found 3 days ago
Select Delta flight, departing Sun, Jul 27 from Baltimore to São Luís, returning Tue, Aug 12, priced at $1,235 found 3 days ago
Delta
Mon, Aug 18 - Mon, Sep 15
BWI
Baltimore
SLZ
São Luís
$1,413 Roundtrip, found 22 hours ago
$1,413
Roundtrip
found 22 hours ago
Select Delta flight, departing Mon, Aug 18 from Baltimore to São Luís, returning Mon, Sep 15, priced at $1,413 found 22 hours ago
LATAM Airlines Group
Mon, Aug 18 - Mon, Sep 15
BWI
Baltimore
SLZ
São Luís
$1,429 Roundtrip, found 22 hours ago
$1,429
Roundtrip
found 22 hours ago
Select LATAM Airlines Group flight, departing Mon, Aug 18 from Baltimore to São Luís, returning Mon, Sep 15, priced at $1,429 found 22 hours ago
United
Mon, Aug 18 - Mon, Sep 15
BWI
Baltimore
SLZ
São Luís
$1,668 Roundtrip, found 22 hours ago
$1,668
Roundtrip
found 22 hours ago
Select United flight, departing Mon, Aug 18 from Baltimore to São Luís, returning Mon, Sep 15, priced at $1,668 found 22 hours ago
Flights from Baltimore (BWI) to Sao Luis (SLZ)
Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Marechal Cunha Machado Intl.
Airlines serving
Delta, LATAM Airlines Group
Roundtrip price
$953
Distance
3544 mi

Baltimore to Sao Luis Flights

The cheapest times to fly from Baltimore 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 Baltimore to Sao Luis are during the month of August. You can find some of the cheapest flights from Baltimore to Sao Luis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Baltimore 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 Baltimore 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 Baltimore to Sao Luis in 2025. You can also book with separate airlines for your outbound and return journeys, from $496 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 Baltimore 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 Baltimore 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 Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ) cost?
Discover the latest flight deals from BWI to SLZ by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from BWI to SLZ?
The cheapest flights from BWI to SLZ are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from BWI to SLZ?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from BWI to SLZ. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ)?
You'll have to hop on a flight with a layover if you're traveling from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from BWI to SLZ?
Usually you'll find the largest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* However, this can change depending on the airline, time of year and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ)?
To touch down at Marechal Cunha Machado Intl. Airport (SLZ) without delays, pick a flight that takes off from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ) last-minute?
Last-minute fares from BWI to SLZ are generally more expensive. For the lowest prices, start searching for flights as soon as possible. That said, if your travel plans are flexible, you may land a cheap fare just before your departure.
Is it cheaper to book a BWI to SLZ flight and hotel package?
Compared with arranging flights and hotels separately, booking a BWI to SLZ flight and hotel package with Expedia could lead to significant savings. What's more, having everything in one place will take the stress out of travel planning. Just secure your flights and select from our extensive range of hotels, then customize your trip with extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Marechal Cunha Machado Intl. Airport (SLZ)?
Typically, you can cancel or modify your BWI to SLZ flight. However, there may be additional fees, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's fees and policies on flight changes, or if you'd like more information, visit our Customer Service portal.

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*Available to One Key members.