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CA $389 Cheap Flights from St. Louis (STL) to Pasco (PSC)

View CA $389 flight on Sun, Aug 23, 2026Opens in a new window

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

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Cheap flights from St. Louis (STL) to Pasco (PSC)

Prices were available within the past 7 days and start at CA $389 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

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

January is typically the cheapest month to fly

From CA $362 - CA $1,068 per traveller.

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 one-way and return flights from STL to PSC with Expedia. 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 our cheapest fares first, and use the Price Tracking tool to receive alerts when STL to PSC ticket fares go up or down.
What is the cheapest month to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
February is typically the cheapest month to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities), with average return fares around CA$546. February often sees lower prices because it falls after the busy holiday travel season, when demand tends to decrease. Other cheap months to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) include April and September.
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)?
American Airlines is one of the cheapest airlines offering connecting return flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) with a layover in Dallas-Fort Worth Intl. (DFW), with tickets starting from around CA$448 for flights that can be booked for departure within the next year. These prices are per adult, for economy/coach class. 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.
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)?
If you're looking for the best balance of price and flight options for a return flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities), you might find November to be a good option. While February and April tend to be the cheapest months, with average prices around CA$546, November is a popular time to travel, meaning you'll have plenty of flight options to choose from. If you're flexible, considering November could give you a good selection of flights, even if the prices aren't the absolute lowest.
How many flights per day from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
There are approximately 23 connecting flights per day from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities). Some common connection points include Seattle - Tacoma Intl. (SEA), O'Hare Intl. (ORD), and Portland Intl. (PDX).
What is the earliest flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
The earliest flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) typically departs around 5:00 AM. This flight is operated by United and is a seasonal service active in October. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
You'll typically find the most flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) on a Tuesday, with around 24 flights available. This gives you a good selection of options for your travel plans. Major airlines on this route include Alaska Airlines, United, and Delta. Looking at the week, Tuesday offers notably more flight options compared to other days, ensuring you have plenty of choices.
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, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities) are in the early morning, from 6am to 9am. Many major carriers, including American Airlines, Delta and Alaska Airlines, offer flights during this window. Many travellers prefer this because it allows for an early start to their journey, often leading to an earlier arrival 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)?
There are no nonstop flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities). For flights with one stop, you can expect the journey to take around 6 hours. This route covers a distance of approximately 2,485 kilometers. Flights with two or more stops will take longer, typically around 11 hours 48 minutes. Keep in mind that actual flight times can vary due to factors like layover duration, routing, and weather conditions.
Can you fly business or first class from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Pasco, WA (PSC-Tri-Cities)?
You can fly business class or first class between STL and PSC. Airlines that offer business class service on this route include:

  • Alaska Airlines
  • United
  • Delta
  • American Airlines

First class cabins are available on:

  • Alaska Airlines
  • United
  • Delta
  • American 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, WA (PSC) from St. Louis, MO (STL)?
If you're planning to travel to Pasco from Lambert-St. Louis Intl. (STL), you can fly directly into Tri-Cities Airport (PSC). Some flights may connect through major hubs like O'Hare Intl. (ORD), Seattle - Tacoma Intl. (SEA), or Dallas-Fort Worth Intl. (DFW) 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
Distance
2469 km

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St. Louis to Pasco Flights

The easy way to book your flights from St. Louis to Pasco 

With Expedia, it’s simple to find and book flights to Pasco from St. Louis whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 5 airlines that cover this route. There are nonstop flights to Tri-Cities, too.  

Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from St. Louis to Pasco today, tomorrow, or this week.  

 

Save dollars with cheap flights from Lambert-St. Louis Intl., STL to Tri-Cities, PSC 

Sort your search results by price to find great deals on your flight from St. Louis to Pasco—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Pasco from St. Louis currently is just rising to .  

Here are more money-saving tips: 

  • Fly in when flight prices are normally at their lowest 
  • Book about a month to 6 weeks before you travel for the best prices to Pasco  
  • Avoid peak season and weekends when flights can cost more
  • Early morning and late-night flights are sometimes cheaper, so try varying your travel times 
  • One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free! 

 

Reasons to choose Expedia for your flight to Pasco from St. Louis 

Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to Pasco with Expedia today.

St. Louis to Pasco Flights

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