$115 Find Cheap Flights from Portland to St. Louis - Compare and Save

Three cabin classes are available on flights from Portland to St. Louis:

• Economy Class
• Business Class
• First Class

A nonstop flight from Portland to St. Louis takes 00m, covering 1,702 miles.

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

Round-trip flights from Portland to St. Louis range from $313 to $493, with an average of $386 over the past 12 months. Anything below $313 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 40% above the $386 route average. Book 18 weeks before departure for the lowest fares.

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $289 round-trip via Phoenix Sky Harbor Intl (PHX), compared to $388 for nonstop.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $45–$45 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

The Boeing 737-900 Passenger/BBJ3 (winglets) family is used most often on this route, operated mainly by Alaska Airlines. Other aircraft seen on the route include Boeing 737 MAX 9 variants.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $245 to $1,659. That means the highest observed fare was about 7x higher than the lowest one.

Alaska Airlines is the only airline on the Portland to St. Louis route offering in-flight Wi-Fi. Pricing depends on fare class.

One-way fares from Portland to St. Louis are currently lower than usual. Average one-way flight prices are about $185, which is 24% below the typical average for this route.

Lambert-St Louis Airport (STL) hosts 5 major car rental companies, with daily rates averaging $78 for economy cars. Top options include:

• Hertz
• Budget
• Alamo
• Enterprise Rent-A-Car
• Payless

Flights from Portland to St. Louis usually depart from Portland (PDX) and arrive at Lambert-St Louis (STL).

One-stop flights from Portland to St. Louis most commonly connect through:

• Salt Lake City (SLC) - 31% of one-stop connections
• Denver Intl (DEN) - 31% of one-stop connections
• Chicago O'Hare Intl (ORD) - 13% of one-stop connections
• Minneapolis St Paul (MSP) - 7% of one-stop connections

Yes. Flexible dates can save you up to 27% on flights from Portland to St. Louis. Tuesday is the cheapest departure day at $347 round-trip on average, while Sunday is the most expensive at $470, a difference of $123.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

Flying via Salt Lake City (SLC) gives the shortest average 1-stop total travel time at 6h 06m, compared with 6h 38m via Denver Intl (DEN) and 6h 42m via Chicago Midway (MDW).

St. Louis is 2 hours ahead of Portland (Central Time vs Pacific Time). Plan for the time shift when scheduling connections or first-day activities.

Some of the most popular sights in St. Louis are Busch Stadium, Enterprise Center and America's Center Convention Complex. These are among the most viewed places in St. Louis on KAYAK.

Among airlines operating Portland to St. Louis flights:

• Alaska Airlines: offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

Here are some options for this route, based on selected ticket types and cabin classes:

• Alaska Airlines: a cabin bag and a checked bag in Business Class
• Hawaiian Airlines: a cabin bag in Economy Class class
• Southwest: a cabin bag in Economy Class class

Bag allowance can vary by ticket type, cabin class, route and airline, so always check the fare details before booking.

Yes. One of these designated play areas is located landside in the D/E terminal, and the other is located airside, adjacent to Gate C17. These indoor playgrounds have seating surrounding them where parents can sit as they watch their kids run around and have fun, burning off energy before the flight to St. Louis.

The most affordable option at PDX is the Economy Lot, which has a free shuttle running between it and the terminals about every 10 minutes. If you want to be a bit closer to the airport and spend a little bit more money, you can opt for the long-term parking spots in Parking Garage P2 and P3.

Yes. At the St. Louis Airport, mothers who need to nurse or pump can take advantage of the Lactation Suites located airside near Gates C7, E31, and A8. Each of these private rooms includes a comfortable chair for Mom, a table, a bench, a foot rest, an electrical outlet, and a sink.

All rental car agencies at the St. Louis Airport are located off airport grounds. When you land at STL, proceed to the Arrivals curb where you can catch a free shuttle to the car rental agency where you have reserved a vehicle. These free shuttles stop at Exit 17 outside Terminal 1 and at Exit 12 outside Terminal 2. Some car rental agencies with free shuttle service to STL include National, Enterprise, Thrifty, Alamo, Hertz, Budget, and Avis.