Cheap Flights from Seattle (SEA) to Belleville (BLV)

Popular airlines from Seattle-Tacoma International Airport (SEA) to Belleville, IL (BLV-MidAmerica-St. Louis)

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to MidAmerica-St. Louis Airport (BLV) cost?
Grab a cheap one-way flight or cheap return flight from Seattle - Tacoma Intl. Airport (SEA) to MidAmerica-St. Louis Airport (BLV) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to MidAmerica-St. Louis Airport (BLV)?
The cheapest month to fly from SEA to BLV is , when there's less demand. Off-peak months are often when better flight deals are available between these airports.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to MidAmerica-St. Louis Airport (BLV)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest SEA to BLV flight.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to MidAmerica-St. Louis Airport (BLV)?
Direct flights from Seattle - Tacoma Intl. Airport (SEA) to MidAmerica-St. Louis Airport (BLV) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel details and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SEA to BLV?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can vary depending on a range of factors, including the airline and season.*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 MidAmerica-St. Louis Airport (BLV)?
To touch down at MidAmerica-St. Louis Airport (BLV) on time, choose a flight that leaves Seattle - Tacoma Intl. Airport (SEA) before 3 PM. The likelihood 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 Seattle - Tacoma Intl. Airport (SEA) to MidAmerica-St. Louis Airport (BLV) last-minute?
Last-minute bookings from SEA to BLV are typically more expensive. To lock in the cheapest rates, start looking for flights ahead of time. That said, if you're flexible with your travel dates, it's possible to find a cheap ticket right before your trip.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to MidAmerica-St. Louis Airport (BLV)?
It's usually possible to reschedule or cancel your SEA to BLV flight. However, for bookings made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
MidAmerica-St. Louis
Distance
1737 mi

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Seattle to Belleville Flights

The cheapest times to fly from Seattle to Belleville

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 Belleville are during the month of . You can find some of the cheapest flights from Seattle to Belleville with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to Belleville

Sunday is one of the best days to book for cheap flights from Seattle to Belleville: 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 Belleville

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 Belleville in 2025. You can also book with separate airlines for your outbound and return journeys, from 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 Belleville 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 Belleville 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.

 

Seattle to Belleville Flights

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*Available to One Key members.