Cheap Flights from Portland (PDX) to St. Louis (XLS)

Popular airlines from Portland International Airport (PDX) to St. Louis (XLS)

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Frequently asked questions

How much does a flight from Portland Intl. Airport (PDX) to St. Louis (XLS) cost?
Grab a cheap one-way flight or cheap return flight from Portland Intl. Airport (PDX) to St. Louis (XLS) 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 Portland Intl. Airport (PDX) to St. Louis (XLS)?
is the cheapest month to fly from PDX to XLS. Avoiding peak travel times is often the key to finding better deals on flights.
What is the cheapest airline that flies from Portland Intl. Airport (PDX) to St. Louis (XLS)?
Use the filter tool on Expedia to compare airlines and find the most affordable carrier that'll take you from PDX to XLS. Then, sort your results by "Price (lowest to highest)" to snap up a good deal.
How many flights per day from Portland Intl. Airport (PDX) to St. Louis (XLS)?
You'll have to take a flight with a layover when traveling from Portland Intl. Airport (PDX) to St. Louis (XLS). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from PDX to XLS?
Generally you'll find the widest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* However, this can change based on the time of year, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Portland Intl. Airport (PDX) to St. Louis (XLS)?
To land at St. Louis (XLS) on time, book a flight that leaves from Portland Intl. Airport (PDX) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Portland Intl. Airport (PDX) to St. Louis (XLS) last-minute?
Waiting until just before your trip to book a ticket from PDX to XLS generally means paying more. While it's possible to find some last-minute deals, they're not always guaranteed. Be flexible with your travel plans to boost your chances of getting a bargain.
Is it cheaper to book a PDX to XLS flight and hotel package?
You'll generally save money by booking a PDX to XLS flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one convenient place. After selecting your ideal accommodations and flights, consider adding extras like car rentals, tours and activities.
Can I cancel or change the date of my flight from Portland Intl. Airport (PDX) to St. Louis (XLS)?
Generally, it's possible to cancel or reschedule your PDX to XLS flight. However, if it's been more than 24 hours since booking, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Origin airport
Portland Intl.
Destination airport
St. Louis
Distance
6175 mi

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Portland to St. Louis Flights

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

 

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

Sunday is one of the best days to book for cheap flights from Portland 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 Portland 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 Portland to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from 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 Portland 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 Portland 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.

 

Portland to St. Louis Flights

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*Available to One Key members.