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

View $218 flight on Sat, Sep 5, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $218 for one-way flights and $425 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Fri, Oct 2 - Sat, Oct 10
STL
St. Louis
PSC
Pasco
$425 Roundtrip, found 6 days ago
$425
Roundtrip
found 6 days ago
Select Delta flight, departing Fri, Oct 2 from St. Louis to Pasco, returning Sat, Oct 10, priced at $425 found 6 days ago
Bargain Flight
Sat, Oct 17 - Sat, Oct 24
STL
St. Louis
PSC
Pasco
$434 Roundtrip, found 6 days ago
$434
Roundtrip
found 6 days ago
Select Bargain Flight flight, departing Sat, Oct 17 from St. Louis to Pasco, returning Sat, Oct 24, priced at $434 found 6 days ago
United
Sat, Nov 7 - Tue, Nov 10
STL
St. Louis
PSC
Pasco
$435 Roundtrip, found 11 hours ago
$435
Roundtrip
found 11 hours ago
Select United flight, departing Sat, Nov 7 from St. Louis to Pasco, returning Tue, Nov 10, priced at $435 found 11 hours ago
American Airlines
Sat, Nov 7 - Tue, Nov 10
STL
St. Louis
PSC
Pasco
$435 Roundtrip, found 11 hours ago
$435
Roundtrip
found 11 hours ago
Select American Airlines flight, departing Sat, Nov 7 from St. Louis to Pasco, returning Tue, Nov 10, priced at $435 found 11 hours ago
Delta
Fri, Oct 2 - Sat, Oct 10
STL
St. Louis
PSC
Pasco
$437 Roundtrip, found 6 days ago
$437
Roundtrip
found 6 days ago
Select Delta flight, departing Fri, Oct 2 from St. Louis to Pasco, returning Sat, Oct 10, priced at $437 found 6 days ago
United
Sat, Nov 7 - Tue, Nov 10
STL
St. Louis
PSC
Pasco
$440 Roundtrip, found 11 hours ago
$440
Roundtrip
found 11 hours ago
Select United flight, departing Sat, Nov 7 from St. Louis to Pasco, returning Tue, Nov 10, priced at $440 found 11 hours ago
Alaska Airlines
Sat, Sep 5 - Fri, Sep 11
STL
St. Louis
PSC
Pasco
$442 Roundtrip, just found
$442
Roundtrip
just found
Select Alaska Airlines flight, departing Sat, Sep 5 from St. Louis to Pasco, returning Fri, Sep 11, priced at $442 just found
Alaska Airlines
Wed, Feb 3 - Sat, Feb 6
STL
St. Louis
PSC
Pasco
$446 Roundtrip, found 3 days ago
$446
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Wed, Feb 3 from St. Louis to Pasco, returning Sat, Feb 6, priced at $446 found 3 days ago
Alaska Airlines
Wed, Feb 3 - Sat, Feb 6
STL
St. Louis
PSC
Pasco
$447 Roundtrip, found 6 days ago
$447
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Wed, Feb 3 from St. Louis to Pasco, returning Sat, Feb 6, priced at $447 found 6 days ago
Alaska Airlines
Sat, Sep 5 - Wed, Sep 9
STL
St. Louis
PSC
Pasco
$449 Roundtrip, found 3 hours ago
$449
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Sat, Sep 5 from St. Louis to Pasco, returning Wed, Sep 9, priced at $449 found 3 hours ago

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

January is typically the cheapest month to fly

From $255 - $752 per traveler.

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

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

Travel between St. Louis (STL) and Pasco (PSC) with a selection of airlines operating on this domestic short-haul route. Evaluate options from various full-service carriers to discover the itinerary that aligns with your budget, schedule, and travel preferences as you delve into the notable sights and neighborhoods of Pasco. Here you’ll find essential details for flights departing from Lambert-St. Louis International Airport (STL) to Tri-Cities Airport (PSC).

  • Fastest flight duration: around 5h 30m 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 $155–$505, depending on seasonality and how far ahead you book

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

Based on the latest traveler bookings, here are the top airlines preferred for flights from St. Louis to Pasco, especially for one-stop services. Common layover options include Denver International Airport (DEN) with an approximate 1 hour and 15 minutes layover, Salt Lake City International Airport (SLC) at around 1 hour and 30 minutes, and Seattle-Tacoma International Airport (SEA) with about a 2 hour and 15 minutes layover. These choices offer the flexibility to balance price, overall travel time, and cabin class, helping you find the ideal itinerary.

  • Delta: As a comprehensive service provider, Delta facilitates one-stop travel with one-way fares generally ranging from $155 to $695. This airline makes up about 35% of departures on the route, featuring an in-flight duration of 5 hours and 30 minutes, and a total travel time of around 7 hours, including layovers.
  • American Airlines: This full-service airline presents one-stop options, with one-way fares typically falling between $165 and $455. American Airlines accounts for roughly 23% of all departures on this route, offering a flight time of 5 hours and 30 minutes and a complete journey lasting about 7 hours, including layovers.
  • United: United Airlines provides a full-service experience with one-stop travel, offering one-way fares that usually range from $155 to $500. This airline represents around 21% of departures for this route, with an in-flight time of 5 hours and 30 minutes, and a total travel duration of approximately 7 hours, including layover time.
  • Alaska Airlines: A full-service carrier, Alaska Airlines offers one-stop service with one-way fares generally between $170 and $500. Accounting for about 19% of departures on this route, the airline features a flight duration of 5 hours and 30 minutes, with a total journey time close to 7 hours, including layovers.

Travelers flying from St. Louis to Pasco have the option to upgrade their experience with Delta, which offers both first class and premium economy service on this route.

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

The most popular months for travelers flying from St. Louis to Pasco are January, April, and July, when peak temperatures in Pasco reach up to 80.1°F in July. If you prefer quieter travel, consider September, the least busy time to visit with temperatures around 68.7°F and typically the lowest average one-way fare (around $229). Flight availability peaks in April, with approximately 10 flights per week, making it easier to find convenient departure times. March, July, August, and December have the fewest flights, with approximately 7 flights per week.

  • Cheapest time to fly: September usually offers good deals with average one-way fare around $229, roughly 26% cheaper than the yearly average.
  • Most flight options: April has the highest number of flights from St. Louis to Pasco, 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
January34.3°F (1.3°C)High8$345
February37.8°F (3.2°C)Low8$305
March45.9°F (7.7°C)Average7$325
April53.8°F (12.1°C)High10$293
May63.7°F (17.6°C)Average8$319
June71.4°F (21.9°C)Average9$328
July80.1°F (26.7°C)High7$292
August78.8°F (26.0°C)Average7$264
September68.7°F (20.4°C)Low8$229
October55.2°F (12.9°C)Low8$331
November41.9°F (5.5°C)Average8$291
December33.4°F (0.8°C)Average7$403

*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 St. Louis (STL) to Pasco (PSC)

  • St. Louis to Richland (STL-RLD): Located approximately 9 miles from Tri-Cities Airport (PSC), Richland Airport (RLD) offers convenient access for travelers.
  • St. Louis to Pasco (SUS-PSC): Spirit of St. Louis Airport (SUS) is about 16 miles away from Lambert-St. Louis International Airport (STL), making it a practical choice for flights.
  • St. Louis to Walla Walla (STL-ALW): Walla Walla Regional Airport (ALW) lies roughly 42 miles from Tri-Cities Airport (PSC), providing further options for your journey.

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

Getting some of the best deals on flights from St. Louis to Pasco 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 2-8 weeks in advance, which aligns with when most travelers make their reservations. Morning departures (5 am-12 pm) often offer lower prices, while afternoon flights (12 pm-6 pm) are more popular. Additionally, flying on Tuesday typically results in cheaper rates, although Wednesday is the most 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.* Find Pasco hotel and flight deals.
  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 Tri-Cities Airport from Lambert-St. Louis International Airport

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

  • Hotel transfer: Transfers offer a convenient way to reach your hotel in Pasco, with options including free hotel shuttles and private rides, which can be arranged in advance with your hotel.
  • Car rental: Renting a car from Tri-Cities Airport is a great option if you plan to explore and sightsee beyond the city. Browse cheap car rentals at Tri-Cities 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 Tri-Cities Airport, Pasco Station, a train station, is located about 3.5 miles away by car, while Burbank Seaport, a seaport, is situated approximately 8.3 miles from the airport, also accessible by car.

Frequently asked questions

How much does a flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) cost?
You can find cheap one-way flights from $218 and cheap return flights from $425 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) with Expedia. One-way flights generally range between $194 and $1055, and roundtrip flights usually range from $445 to $1674. 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
February is the cheapest month to fly from St. Louis to Pasco, with average round-trip fares around $393. This fare is about 22% lower than the average price throughout the year, as winter travel tends to see less demand. Other affordable months to fly from St. Louis to Pasco include April and September.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
Enter STL to PSC and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
Delta is one of the cheapest airlines offering connecting flights from Lambert-St. Louis Intl. (STL) to Tri-Cities (PSC) with return tickets starting from around $278.19. This flight includes a layover in Detroit Metropolitan Wayne County (DTW). 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
To find a cheap flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities), 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
When flying from St. Louis to Pasco, February and April stand out as the best months. With average return flight prices around $393, these months provide a good balance of affordability and travel experience. February is often less crowded, while April brings springtime blooms to the region.*Prices based on flights available on Expedia in the last year.
What is the earliest flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
The earliest flight from Lambert-St. Louis International Airport (STL) to Tri-Cities Airport (PSC) usually departs at around 5:00 AM, operated by American Airlines. This seasonal service is available in May, and an early departure can help you enjoy a full day in Pasco. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
The most popular departure times for flights from St. Louis (STL) to Pasco (PSC) are in the early morning, from 6am to 9am. This time window accounts for around 36% of total traffic. Many major carriers, including American Airlines and Delta, offer flights during this period. Many travelers prefer this timing as it allows them to start their day early and maximize their time at their destination.
How long does it take to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
Flying from STL to PSC with a connection usually takes about 6 hours 30 minutes, traveling roughly 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
First class seats are offered on the STL to PSC route. First class cabins are available on:

  • American Airlines
  • Delta Air Lines
  • United Airlines

How do I earn miles on a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) flight with Expedia?
It's easy to earn miles on a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) 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 Pasco from Lambert-St. Louis Intl. (STL)?
From Lambert-St. Louis Intl. (STL), you can fly into Tri-Cities (PSC) to reach Pasco. Some flights may connect through major hubs like O'Hare Intl. (ORD), Dallas-Fort Worth Intl. (DFW), Denver Intl. (DEN) before reaching Pasco. 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) at the last minute?
Typically, booking a last minute flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) flight and hotel package?
Securing a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) flight and hotel package 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 St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
If you booked your St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) 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
Lambert-St. Louis Intl.
Destination airport
Tri-Cities
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Roundtrip price
$424
Distance
1543 mi

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 October. 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 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 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

*Flight schedules are subject to change.

*Available to One Key members.

 

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