$139 Cheap Flights from Pasco (PSC) to St. Louis (STL)

View $139 flight on Sat, Nov 8, 2025Opens in a new window

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

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • one key icon

    Earn twice

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

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

Prices were available within the past 7 days and start at $139 for one-way flights and $249 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Feb 10 - Wed, Feb 25
PSC
Pasco
STL
St. Louis
$249 Roundtrip, found 14 hours ago
$249
Roundtrip
found 14 hours ago
Select Delta flight, departing Tue, Feb 10 from Pasco to St. Louis, returning Wed, Feb 25, priced at $249 found 14 hours ago
Delta
Wed, Feb 18 - Tue, Mar 3
PSC
Pasco
STL
St. Louis
$271 Roundtrip, found 14 hours ago
$271
Roundtrip
found 14 hours ago
Select Delta flight, departing Wed, Feb 18 from Pasco to St. Louis, returning Tue, Mar 3, priced at $271 found 14 hours ago
Delta
Wed, Oct 29 - Tue, Nov 4
PSC
Pasco
STL
St. Louis
$274 Roundtrip, found 1 hour ago
$274
Roundtrip
found 1 hour ago
Select Delta flight, departing Wed, Oct 29 from Pasco to St. Louis, returning Tue, Nov 4, priced at $274 found 1 hour ago
Delta
Tue, Oct 28 - Wed, Oct 29
PSC
Pasco
STL
St. Louis
$278 Roundtrip, found 23 hours ago
$278
Roundtrip
found 23 hours ago
Select Delta flight, departing Tue, Oct 28 from Pasco to St. Louis, returning Wed, Oct 29, priced at $278 found 23 hours ago
Delta
Sat, Nov 22 - Wed, Dec 3
PSC
Pasco
STL
St. Louis
$280 Roundtrip, found 2 days ago
$280
Roundtrip
found 2 days ago
Select Delta flight, departing Sat, Nov 22 from Pasco to St. Louis, returning Wed, Dec 3, priced at $280 found 2 days ago
Delta
Tue, Nov 4 - Sat, Nov 8
PSC
Pasco
STL
St. Louis
$284 Roundtrip, found 1 hour ago
$284
Roundtrip
found 1 hour ago
Select Delta flight, departing Tue, Nov 4 from Pasco to St. Louis, returning Sat, Nov 8, priced at $284 found 1 hour ago
Hawaiian Airlines
Tue, Feb 10 - Sat, Feb 28
PSC
Pasco
STL
St. Louis
$317 Roundtrip, found 14 hours ago
$317
Roundtrip
found 14 hours ago
Select Hawaiian Airlines flight, departing Tue, Feb 10 from Pasco to St. Louis, returning Sat, Feb 28, priced at $317 found 14 hours ago
Alaska Airlines
Wed, Oct 22 - Tue, Oct 28
PSC
Pasco
STL
St. Louis
$322 Roundtrip, found 2 days ago
$322
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Wed, Oct 22 from Pasco to St. Louis, returning Tue, Oct 28, priced at $322 found 2 days ago
United
Wed, Oct 22 - Tue, Oct 28
PSC
Pasco
STL
St. Louis
$326 Roundtrip, found 2 days ago
$326
Roundtrip
found 2 days ago
Select United flight, departing Wed, Oct 22 from Pasco to St. Louis, returning Tue, Oct 28, priced at $326 found 2 days ago
American Airlines
Tue, Nov 4 - Wed, Nov 12
PSC
Pasco
STL
St. Louis
$367 Roundtrip, found 6 days ago
$367
Roundtrip
found 6 days ago
Select American Airlines flight, departing Tue, Nov 4 from Pasco to St. Louis, returning Wed, Nov 12, priced at $367 found 6 days ago

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

August is typically the cheapest month to fly

From $260 - $641 per traveler.

Alternative airports near St. Louis

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

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $584
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $584

Frequently asked questions

How much does a flight from Tri-Cities Airport (PSC) to Lambert-St. Louis Intl. Airport (STL) cost?
Grab a cheap one-way flight from $139 or cheap return flight from $249 from Tri-Cities Airport (PSC) to Lambert-St. Louis Intl. Airport (STL) 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 Tri-Cities Airport (PSC) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from PSC to STL is February, when there's less demand. Off-peak season is often when you'll find cheap fares for travel between these airports.
What is the cheapest airline that flies from Tri-Cities Airport (PSC) to Lambert-St. Louis Intl. Airport (STL)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest PSC to STL flight.
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.

Travel information

Travel information

Origin airport
Tri-Cities
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United
Roundtrip price
$248
Distance
1543 mi

Book with confidence

Book with confidence

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 February. 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 $139 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.

 

Pasco to St. Louis Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.