$140 Cheap Flights from Pasco (PSC) to St. Louis (STL)

View $140 flight on Wed, Aug 6, 2025Opens in a new window

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

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

Prices were available within the past 7 days and start at $140 for one-way flights and $279 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Aug 5 - Tue, Aug 12
PSC
Pasco
STL
St. Louis
$279 Roundtrip, found 16 hours ago
$279
Roundtrip
found 16 hours ago
Select Delta flight, departing Tue, Aug 5 from Pasco to St. Louis, returning Tue, Aug 12, priced at $279 found 16 hours ago
Delta
Tue, Aug 19 - Wed, Sep 3
PSC
Pasco
STL
St. Louis
$322 Roundtrip, found 18 hours ago
$322
Roundtrip
found 18 hours ago
Select Delta flight, departing Tue, Aug 19 from Pasco to St. Louis, returning Wed, Sep 3, priced at $322 found 18 hours ago
Delta
Tue, Aug 19 - Sat, Sep 6
PSC
Pasco
STL
St. Louis
$329 Roundtrip, found 18 hours ago
$329
Roundtrip
found 18 hours ago
Select Delta flight, departing Tue, Aug 19 from Pasco to St. Louis, returning Sat, Sep 6, priced at $329 found 18 hours ago
Delta
Tue, Aug 19 - Fri, Sep 5
PSC
Pasco
STL
St. Louis
$332 Roundtrip, found 18 hours ago
$332
Roundtrip
found 18 hours ago
Select Delta flight, departing Tue, Aug 19 from Pasco to St. Louis, returning Fri, Sep 5, priced at $332 found 18 hours ago
American Airlines
Wed, Aug 6 - Sat, Aug 9
PSC
Pasco
STL
St. Louis
$333 Roundtrip, found 16 hours ago
$333
Roundtrip
found 16 hours ago
Select American Airlines flight, departing Wed, Aug 6 from Pasco to St. Louis, returning Sat, Aug 9, priced at $333 found 16 hours ago
Delta
Tue, Aug 5 - Sat, Aug 9
PSC
Pasco
STL
St. Louis
$335 Roundtrip, found 4 days ago
$335
Roundtrip
found 4 days ago
Select Delta flight, departing Tue, Aug 5 from Pasco to St. Louis, returning Sat, Aug 9, priced at $335 found 4 days ago
American Airlines
Sat, Aug 2 - Tue, Aug 5
PSC
Pasco
STL
St. Louis
$337 Roundtrip, found 6 days ago
$337
Roundtrip
found 6 days ago
Select American Airlines flight, departing Sat, Aug 2 from Pasco to St. Louis, returning Tue, Aug 5, priced at $337 found 6 days ago
Hawaiian Airlines
Sun, Aug 31 - Sat, Sep 6
PSC
Pasco
STL
St. Louis
$342 Roundtrip, found 2 days ago
$342
Roundtrip
found 2 days ago
Select Hawaiian Airlines flight, departing Sun, Aug 31 from Pasco to St. Louis, returning Sat, Sep 6, priced at $342 found 2 days ago
Alaska Airlines
Sat, Aug 23 - Sun, Aug 31
PSC
Pasco
STL
St. Louis
$358 Roundtrip, found 5 hours ago
$358
Roundtrip
found 5 hours ago
Select Alaska Airlines flight, departing Sat, Aug 23 from Pasco to St. Louis, returning Sun, Aug 31, priced at $358 found 5 hours ago
United
Sat, Aug 2 - Tue, Aug 5
PSC
Pasco
STL
St. Louis
$359 Roundtrip, found 6 days ago
$359
Roundtrip
found 6 days ago
Select United flight, departing Sat, Aug 2 from Pasco to St. Louis, returning Tue, Aug 5, priced at $359 found 6 days ago

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

September is typically the cheapest month to fly

From $260 - $555 per traveler.

Graph displaying average flight prices per month

Flights from Pasco (PSC) to St. Louis (STL)
Origin airport
Tri-Cities
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United
Roundtrip price
$278
Distance
1543 mi

Pasco to St. Louis Flights

The cheapest times to fly from Pasco to St. Louis

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

 

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

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

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 Pasco to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $140 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 Pasco to St. Louis 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 Pasco to St. Louis 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 Tri-Cities Airport (PSC) to Lambert-St. Louis Intl. Airport (STL) cost?
Discover the latest flight deals from PSC to STL 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 PSC to STL?
The cheapest flights from PSC to STL 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 PSC to STL?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from PSC to STL. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Tri-Cities Airport (PSC) to Lambert-St. Louis Intl. Airport (STL)?
You'll have to catch a flight with a layover when traveling from Tri-Cities Airport (PSC) to Lambert-St. Louis Intl. Airport (STL). There are no daily direct flights on this route. However, simply filter your search to include one or more stops to find an option that works for you.
What day of the week has the most flights from PSC to STL?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can change based on a range of factors, such as the carrier 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 Tri-Cities Airport (PSC) to Lambert-St. Louis Intl. Airport (STL)?
To avoid potential delays on the Tri-Cities Airport (PSC) to Lambert-St. Louis Intl. Airport (STL) route, aim to fly before 3 PM. Flights after this time have a 22% higher chance of cancellation.**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 Tri-Cities Airport (PSC) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Holding off until right before your break to book your flight from PSC to STL generally means paying more. While you may come across some last-minute offers, there's no guarantee. Keep your travel schedule open to maximize your chances of snagging a bargain.
Is it cheaper to book a PSC to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking a PSC to STL flight and hotel package with Expedia could lead to significant savings. What's more, having everything in one place will take the hassle out of planning your trip. Just secure your flights and select from our wide range of hotels, then personalize your trip with extras like car rentals and activities.
Can I cancel or change the date of my flight from Tri-Cities Airport (PSC) to Lambert-St. Louis Intl. Airport (STL)?
If you reserved your PSC to STL flight in the last 24 hours, you may be able to cancel or modify it without fees. Depending on the airline and the type of fare you have, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal if you'd like more information.

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*Available to One Key members.