A city skyline with a prominent arch bridge at sunset.

$218 Cheap Flights from Pasco (PSC) to St. Louis (STL)

View $218 flight on Sun, Sep 6, 2026Opens 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 $218 for one-way flights and $435 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sat, Oct 31 - Tue, Nov 10
PSC
Pasco
STL
St. Louis
$435 Roundtrip, found 1 day ago
$435
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sat, Oct 31 from Pasco to St. Louis, returning Tue, Nov 10, priced at $435 found 1 day ago
Delta
Sat, Oct 31 - Tue, Nov 10
PSC
Pasco
STL
St. Louis
$435 Roundtrip, found 1 day ago
$435
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Oct 31 from Pasco to St. Louis, returning Tue, Nov 10, priced at $435 found 1 day ago
United
Sat, Oct 31 - Tue, Nov 10
PSC
Pasco
STL
St. Louis
$435 Roundtrip, found 1 day ago
$435
Roundtrip
found 1 day ago
Select United flight, departing Sat, Oct 31 from Pasco to St. Louis, returning Tue, Nov 10, priced at $435 found 1 day ago
American Airlines
Wed, Nov 11 - Sat, Nov 14
PSC
Pasco
STL
St. Louis
$438 Roundtrip, found 3 days ago
$438
Roundtrip
found 3 days ago
Select American Airlines flight, departing Wed, Nov 11 from Pasco to St. Louis, returning Sat, Nov 14, priced at $438 found 3 days ago
United
Sat, Oct 31 - Tue, Nov 10
PSC
Pasco
STL
St. Louis
$440 Roundtrip, found 1 day ago
$440
Roundtrip
found 1 day ago
Select United flight, departing Sat, Oct 31 from Pasco to St. Louis, returning Tue, Nov 10, priced at $440 found 1 day ago
Alaska Airlines
Sat, Sep 5 - Fri, Sep 11
PSC
Pasco
STL
St. Louis
$442 Roundtrip, found 3 days ago
$442
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Sat, Sep 5 from Pasco to St. Louis, returning Fri, Sep 11, priced at $442 found 3 days ago
Alaska Airlines
Wed, Oct 28 - Wed, Nov 4
PSC
Pasco
STL
St. Louis
$447 Roundtrip, found 8 hours ago
$447
Roundtrip
found 8 hours ago
Select Alaska Airlines flight, departing Wed, Oct 28 from Pasco to St. Louis, returning Wed, Nov 4, priced at $447 found 8 hours ago
Alaska Airlines
Sat, Sep 5 - Fri, Sep 11
PSC
Pasco
STL
St. Louis
$449 Roundtrip, found 3 days ago
$449
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Sat, Sep 5 from Pasco to St. Louis, returning Fri, Sep 11, priced at $449 found 3 days ago
American Airlines
Wed, Nov 18 - Tue, Nov 24
PSC
Pasco
STL
St. Louis
$452 Roundtrip, found 18 hours ago
$452
Roundtrip
found 18 hours ago
Select American Airlines flight, departing Wed, Nov 18 from Pasco to St. Louis, returning Tue, Nov 24, priced at $452 found 18 hours ago
United
Tue, Oct 13 - Sat, Oct 17
PSC
Pasco
STL
St. Louis
$456 Roundtrip, found 2 days ago
$456
Roundtrip
found 2 days ago
Select United flight, departing Tue, Oct 13 from Pasco to St. Louis, returning Sat, Oct 17, priced at $456 found 2 days ago

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 $435
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $435

What you need to know for your flight from Tri-Cities to Lambert-St. Louis Intl.

Pasco (PSC) to St. Louis (STL) at a glance

Travel from Pasco (PSC) to St. Louis (STL) with a range of airlines offering convenient domestic short-haul flights. Whether you're looking for cheap flights from Pasco or preferring full-service options, you can compare various itineraries to suit your budget and schedule. Discover the essential information for flights from Tri-Cities Airport (PSC) to Lambert-St. Louis International Airport (STL) as you prepare to explore the vibrant sights and neighborhoods of St. Louis.

  • Fastest flight duration: around 4h 45m in-flight, plus roughly 1h 15m layover with one stop
  • Route distance: roughly 1,500 miles (2,410 km)
  • Flights per week: around 8 departures on average
  • Typical fares (one-way): economy tickets often range from $145–$460, depending on seasonality and how far ahead you book

Flights from Tri-Cities Airport (PSC) to Lambert-St. Louis International Airport (STL)

Based on recent travel bookings, here are the top airlines favored for one-stop flights from Pasco to St. Louis. Popular layover options include Salt Lake City International Airport (SLC) with a layover of about 1 hour, Seattle-Tacoma International Airport (SEA) at approximately 1 hour and 30 minutes, and Denver International Airport (DEN) with a 1 hour and 15 minutes stopover. These choices allow you to compare prices, total travel time, and cabin class to craft the perfect itinerary for your journey.

  • Delta: As a leading full-service airline, Delta provides one-stop service with one-way ticket prices generally falling between $145 and $500. It operates about 50% of departures on this route, featuring an in-flight duration of 4 hours and 45 minutes, while the overall travel time is approximately 6 hours, including layovers.
  • United: United is another comprehensive carrier that offers one-stop flights, with fares typically ranging from $170 to $565 for one-way travel. Representing around 21% of departures on this route, passengers can expect an in-flight time of 4 hours and 45 minutes and a total travel duration of about 6 hours, including layovers.
  • Alaska Airlines: A reliable full-service option, Alaska Airlines provides one-stop service with one-way fares usually between $170 and $425. This airline accounts for roughly 19% of departures on this route, featuring an in-flight time of 4 hours and 45 minutes, while the total journey time is approximately 6 hours, including layovers.
  • American Airlines: Offering a full-service experience, American Airlines provides one-stop flights with one-way ticket prices generally ranging from $145 to $370. This carrier represents about 10% of route departures, with an in-flight duration of 4 hours and 45 minutes, leading to a total travel time of around 6 hours, including layovers.

Travelers have the option to upgrade their flight from Pasco to St. Louis, with Delta providing first-class service on this route.

Best time to fly from Pasco (PSC) to St. Louis (STL)

The most popular months for travelers flying from Pasco to St. Louis are April, July, and August, when peak temperatures in St. Louis reach up to 78.6°F in July. If you prefer quieter travel, consider September, the least busy time to visit with temperatures around 70.9°F and typically the lowest average one-way fare (around $230). Flight availability peaks in June, with approximately 10 flights per week, making it easier to find convenient departure times.

  • Cheapest time to fly: September usually offers good deals with average one-way fare around $230, roughly 22% cheaper than the yearly average.
  • Another budget-friendly time to fly: December typically offers an average one-way fare of around $261.
  • Most flight options: June has the highest number of flights from Pasco to St. Louis, with approximately 10 flights per week, giving you more flexibility in scheduling your trip.
calendar iconMonthtemperature iconTemperaturecrowd level iconDemandflights iconWeekly Flightsprice iconAverage one-way Fare
January31.6°F (-0.2°C)Average9$354
February34.9°F (1.6°C)Average7$294
March46.4°F (8.0°C)Average8$293
April56.1°F (13.4°C)High9$284
May66.6°F (19.2°C)Low9$267
June76.1°F (24.5°C)Average10$293
July78.6°F (25.9°C)High8$299
August77.0°F (25.0°C)High9$297
September70.9°F (21.6°C)Low7$230
October58.6°F (14.8°C)Average7$319
November46.2°F (7.9°C)Low9$374
December37.8°F (3.2°C)Average8$261

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

Alternative routes from Pasco (PSC) to St. Louis (STL)

  • Richland to St. Louis (RLD-STL): Richland Airport (RLD) is located approximately 9 miles from Tri-Cities Airport (PSC).
  • Walla Walla to St. Louis (ALW-STL): Walla Walla Regional Airport (ALW) lies about 42 miles from Tri-Cities Airport (PSC).
  • Pasco to Springfield (PSC-SPI): Abraham Lincoln Capital Airport (SPI) is roughly 85 miles from Lambert-St. Louis International Airport (STL).

How to find the best prices for flights from Pasco (PSC) to St. Louis (STL)

Getting some of the best deals on flights from Pasco to St. Louis is all about timing and flexibility. Here are some key tips to help you save:

  1. Best times to book and fly: cheaper fares are usually available when booking at least two months in advance, although most travelers tend to book between two to eight weeks ahead. Afternoon departures from 12 PM to 6 PM are generally less expensive, while morning flights from 5 AM to 12 PM are the most popular. Additionally, flying on Wednesday offers both lower prices and is the favored travel day.
  2. Set up price alerts: stay updated on price changes by using Expedia's Price Tracker. Receive alerts when fares drop for your selected route.
  3. Bundle and save: bundle your flight and hotel to save on Expedia, or unlock a hotel deal after booking your flight.*
  4. Compare flight options: use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
  5. Stay flexible with dates: being open to different travel days can sometimes help you find better prices on flights and hotels.
  6. Think about luggage: nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your allowance before confirming your booking to avoid excess baggage fees at the airport.

*Members only. Savings vary and are not available on all bundles. Select hotels.

Arriving at Lambert-St. Louis International Airport from Tri-Cities Airport

St. Louis welcomes travelers from Pasco with a range of transport options based on price, convenience, and proximity. Here's how to reach St. Louis efficiently:

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in St. Louis, with private rides that can be arranged in advance.
  • Car rental: Renting a car from Lambert-St. Louis International Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Lambert-St. Louis International Airport on Expedia.
  • Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.
  • Public transportation: From Lambert-St. Louis International Airport, Lambert Main Terminal Station, a metro station, is located about 0.1 miles away on foot, providing easy access to public transport for travelers.

Frequently asked questions

How much does a flight from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find cheap one-way flights from $218 and cheap return flights from $435 Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.) with Expedia. One-way flights usually range from $216 to $1301, and return flights typically cost between $440 and $1500. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
January is the cheapest month to fly from Pasco, WA (PSC) to St. Louis, MO (STL), with average return fares around $347. This is about 34% lower than the average price throughout the year, as demand tends to drop after the holiday season. Other budget-friendly months to fly from Pasco to St. Louis include September and October.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Enter PSC to STL and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Delta is one of the cheapest airlines offering connecting flights from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.), with round-trip tickets starting from around $876 with a layover in Seattle - Tacoma Intl. (SEA). Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best times to fly from Pasco (PSC) to St. Louis (STL) are January and September. With average return flight prices around $347, these months are budget-friendly. January typically sees fewer travelers, while September offers a good mix of price and availability, making it easier for you to plan your trip.*Prices based on flights available on Expedia in the last year.
What is the earliest flight from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from PSC to STL. To compare more early flights, use the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from Pasco (PSC) to St. Louis (STL) are in the early morning, from 6am to 9am. This accounts for about 41% of total traffic. Many major carriers, including Delta, Alaska Airlines, and United, offer flights during this window. This timing works well because it allows travelers to maximize their time in St. Louis upon arrival.
How long does it take to fly from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
A flight from PSC to STL with a layover takes around 6 hours 20 minutes, with the route covering approximately 1,544 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
First class is available on flights from PSC to STL. First class cabins are available on:

  • American Airlines
  • Delta Air Lines
  • United Airlines

How do I earn miles on a Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for St. Louis from Tri-Cities (PSC)?
If you're planning to travel to St. Louis from Tri-Cities (PSC), you can fly into Lambert-St. Louis Intl. (STL) Some flights may connect through major hubs like Denver Intl. (DEN), Seattle - Tacoma Intl. (SEA), San Francisco Intl. (SFO) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.) St Louis Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your Pasco, WA (PSC-Tri-Cities) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Tri-Cities
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Roundtrip price
$429
Distance
1543 mi

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 October. 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 2026. You can also book with separate airlines for your outbound and return journeys, from $218 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

*Flight schedules are subject to change.

*Available to One Key members.

 

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