$148 Cheap Flights from St. Louis (STL) to Pasco (PSC)

View $148 flight on Tue, Dec 9, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Tri-Cities Airport (PSC)

    notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
    deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
    trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from St. Louis to Pasco (STL-PSC)

Prices were available within the past 7 days and start at $148 for one-way flights and $256 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Mon, Nov 3 - Wed, Nov 12
STL
St. Louis
PSC
Pasco
$256 Roundtrip, found 1 day ago
$256
Roundtrip
found 1 day ago
Select Delta flight, departing Mon, Nov 3 from St. Louis to Pasco, returning Wed, Nov 12, priced at $256 found 1 day ago
Delta
Wed, Oct 29 - Sat, Nov 8
STL
St. Louis
PSC
Pasco
$274 Roundtrip, found 2 days ago
$274
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, Oct 29 from St. Louis to Pasco, returning Sat, Nov 8, priced at $274 found 2 days ago
Delta
Sat, Nov 1 - Sat, Nov 8
STL
St. Louis
PSC
Pasco
$283 Roundtrip, found 5 hours ago
$283
Roundtrip
found 5 hours ago
Select Delta flight, departing Sat, Nov 1 from St. Louis to Pasco, returning Sat, Nov 8, priced at $283 found 5 hours ago
Delta
Mon, Nov 3 - Mon, Nov 10
STL
St. Louis
PSC
Pasco
$289 Roundtrip, found 19 hours ago
$289
Roundtrip
found 19 hours ago
Select Delta flight, departing Mon, Nov 3 from St. Louis to Pasco, returning Mon, Nov 10, priced at $289 found 19 hours ago
Delta
Thu, Oct 30 - Mon, Nov 10
STL
St. Louis
PSC
Pasco
$294 Roundtrip, found 2 days ago
$294
Roundtrip
found 2 days ago
Select Delta flight, departing Thu, Oct 30 from St. Louis to Pasco, returning Mon, Nov 10, priced at $294 found 2 days ago
Hawaiian Airlines
Tue, Nov 4 - Sun, Nov 9
STL
St. Louis
PSC
Pasco
$294 Roundtrip, found 1 day ago
$294
Roundtrip
found 1 day ago
Select Hawaiian Airlines flight, departing Tue, Nov 4 from St. Louis to Pasco, returning Sun, Nov 9, priced at $294 found 1 day ago
Delta
Tue, Nov 11 - Wed, Nov 12
STL
St. Louis
PSC
Pasco
$296 Roundtrip, found 3 days ago
$296
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Nov 11 from St. Louis to Pasco, returning Wed, Nov 12, priced at $296 found 3 days ago
American Airlines
Sat, Nov 1 - Sat, Nov 8
STL
St. Louis
PSC
Pasco
$303 Roundtrip, found 5 hours ago
$303
Roundtrip
found 5 hours ago
Select American Airlines flight, departing Sat, Nov 1 from St. Louis to Pasco, returning Sat, Nov 8, priced at $303 found 5 hours ago
United
Sat, Nov 1 - Sat, Nov 8
STL
St. Louis
PSC
Pasco
$308 Roundtrip, found 5 hours ago
$308
Roundtrip
found 5 hours ago
Select United flight, departing Sat, Nov 1 from St. Louis to Pasco, returning Sat, Nov 8, priced at $308 found 5 hours ago
Alaska Airlines
Mon, Nov 3 - Mon, Nov 10
STL
St. Louis
PSC
Pasco
$315 Roundtrip, found 19 hours ago
$315
Roundtrip
found 19 hours ago
Select Alaska Airlines flight, departing Mon, Nov 3 from St. Louis to Pasco, returning Mon, Nov 10, priced at $315 found 19 hours ago

Find the cheapest month to fly from St. Louis (STL) to Pasco (PSC)

September is typically the cheapest month to fly

From $273 - $712 per traveler.

Alternative airports near Pasco

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

Select flight to Tri-Cities PSC. Cheapest and Closest option available. Average driving time to city center is 4 minutes. Flights from $411
PSC
Tri-Cities
CheapestClosest
Average driving time to city center4 min
Flights from $411

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Tri-Cities Airport (PSC) cost?
Grab a cheap one-way flight from $148 or cheap return flight from $256 from Lambert-St. Louis Intl. Airport (STL) to Tri-Cities Airport (PSC) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Tri-Cities Airport (PSC)?
The cheapest month to fly from STL to PSC is November, when demand is low. Off-peak months are generally when airlines offer lower prices between these airports.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Tri-Cities Airport (PSC)?
To find the cheapest airline that'll fly you from STL to PSC, use Expedia's filter tool. Customize your search based on what's important to you, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Tri-Cities Airport (PSC)?
You'll need to book a flight with a layover if you're traveling from Lambert-St. Louis Intl. Airport (STL) to Tri-Cities Airport (PSC). Direct flights don't operate daily on this route. However, simply filter your search to include one or more stops to discover the best option for your trip.
What day of the week has the most flights from STL to PSC?
Usually you'll find the largest variety of flight choices on a Friday. Tuesdays are often the quietest.* But this can vary 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 Lambert-St. Louis Intl. Airport (STL) to Tri-Cities Airport (PSC)?
To land at Tri-Cities Airport (PSC) on schedule, choose a flight that leaves from Lambert-St. Louis Intl. Airport (STL) 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 Lambert-St. Louis Intl. Airport (STL) to Tri-Cities Airport (PSC) last-minute?
Booking your flight from STL to PSC shortly before your trip is generally more expensive. However, if you're flexible with your departure times and dates, you could bag a cheap last-minute fare.
Is it cheaper to book a STL to PSC flight and hotel package?
Compared with arranging flights and hotels separately, booking a STL to PSC flight and hotel package with Expedia could lead to significant savings. What's more, having it all in one place takes the hassle out of planning your trip. Just pick your flights and select from our extensive range of hotels, then tailor your trip with other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Tri-Cities Airport (PSC)?
If you reserved your STL to PSC flight in the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for more information.

Travel information

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Tri-Cities
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United
Roundtrip price
$255
Distance
1543 mi

Book with confidence

Book with confidence

St. Louis to Pasco Flights

The cheapest times to fly from St. Louis to Pasco

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

 

The best time to book a flight from St. Louis to Pasco

Sunday is one of the best days to book for cheap flights from St. Louis to Pasco: 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 St. Louis to Pasco

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 St. Louis to Pasco in 2025. You can also book with separate airlines for your outbound and return journeys, from $148 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 St. Louis to Pasco 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 St. Louis to Pasco 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.

 

St. Louis to Pasco Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.