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STL - PDX

Find cheap flights from St. Louis to Portland from $45

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Portland departing on 5/15. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Sun 5/26
Sun 6/2

Search hundreds of travel sites at once for deals on flights to Portland

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Portland.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Portland.
In the last 7 days travelers have searched 44,335,567 times on KAYAK, and here is why:

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Cheap flight deals from St. Louis to Portland (STL-PDX)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Portland that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
11:36 am - 12:07 amSTL-PDX
14h 31m1 stop
8:40 am - 9:31 pmPDX-STL
10h 51m1 stop
Wed, May 15 - Mon, May 20
10:59 pm - 9:15 amSTL-PDX
12h 16m1 stop
12:59 am - 2:29 pmPDX-STL
11h 30m1 stop
$128Frontier
Find Deal
Thu, May 9 - Sat, May 11
10:59 pm - 12:26 pmSTL-PDX
15h 27m2 stops
12:59 am - 2:29 pmPDX-STL
11h 30m1 stop
$133Frontier
Find Deal
Thu, May 9 - Sat, May 11
1:55 pm - 10:52 pmSTL-PDX
10h 57m1 stop
11:58 am - 1:05 pmPDX-STL
23h 07m1 stop
$174Spirit Airlines
Find Deal
Wed, Jun 12 - Tue, Jun 18
11:36 am - 12:07 amSTL-PDX
14h 31m1 stop
11:30 pm - 1:37 pmPDX-STL
12h 07m2 stops
$195Spirit Airlines
Find Deal
Wed, May 15 - Mon, May 20
5:53 pm - 11:17 pmSTL-PDX
7h 24m1 stop
11:53 am - 9:55 pmPDX-STL
8h 02m1 stop
$270Delta
Find Deal
Fri, Jun 7 - Mon, Jun 10
7:01 am - 12:52 pmSTL-PDX
7h 51m1 stop
9:55 pm - 9:53 amPDX-STL
9h 58m1 stop
$294American Airlines
Find Deal
Wed, May 15 - Wed, May 29
5:08 pm - 10:53 pmSTL-PDX
7h 45m1 stop
11:54 pm - 11:10 amPDX-STL
9h 16m1 stop
$296American Airlines
Find Deal
Sun, May 26 - Mon, May 27
7:31 pm - 11:44 pmSTL-PDX
6h 13m1 stop
7:00 am - 11:59 pmPDX-STL
14h 59m2 stops
$329Alaska Airlines
Find Deal
Fri, Sep 13 - Tue, Sep 17
2:28 pm - 8:38 pmSTL-PDX
8h 10m2 stops
12:30 am - 10:30 amPDX-STL
8h 00m1 stop
$332Delta
Find Deal
Mon, Jun 3 - Fri, Jun 7

Flights from St. Louis to Portland - Travel Insights & Trends

Get data-powered insights and trends into flights from St. Louis to Portland to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from St. Louis to Portland?

The average price of all flights from St. Louis to Portland clicked on KAYAK for each day over the last 12 months.
If you are looking for a flight deal from St. Louis to Portland, look for departures on Saturdays and avoid leaving on a Sunday, as it's usually the priciest day. When flying back from Portland, Saturday is the cheapest day to fly and Sunday is the most expensive.

What is the cheapest month to fly from St. Louis to Portland?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from St. Louis to Portland, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from St. Louis to Portland is September, where tickets cost $364 on average. On the other hand, the most expensive months are December and June, where the average cost of tickets is $527 and $516 respectively.

How far in advance should I book a flight from St. Louis to Portland?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from St. Louis to Portland, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from St. Louis to Portland, you should book around 4 days before departure. For the absolute cheapest price, our data suggests you should book 53 days before departure.

Which airlines provide the cheapest flights from St. Louis to Portland?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 72 hours, the cheapest one-way ticket from St. Louis to Portland found on KAYAK was with Spirit Airlines for $45. Frontier proposed a round-trip connection from $128 and Spirit Airlines from $174.

Good to know

Low season

February

High season

July

Cheapest flight

$45
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly with an average 9% increase in price.
Flight from St. Louis to Portland

When to book flights from St. Louis to Portland

Are your dates flexible? Find out the best times to travel from St. Louis to Portland based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Portland

  • What are the transport options from Portland International Airport?

    The easiest way to get downtown is by taking the light rail. PDX is connected to the city by the MAX light rail system, and the Red Line trains depart every 15min. You can also take the shuttle from PDX with several companies offering door-to-door and inter-city shuttle services from PDX. Taxis are also available on the lower roadway around baggage claim, and no reservations are needed. Car rentals are available too, and most companies provide shuttle services from the baggage claim area to the offsite car rental station on the lower roadway.

  • Does Portland International Airport offer accessible services?

    The airport has provided elevators and ramps for passengers in wheelchairs. People with limited mobility also get reserved parking spots, accessible restrooms, fast track services, and dedicated seating areas. Aira services are available for low-vision passengers traveling through PDX. They will also be allowed guide dogs, and braille signage, audio announcements, and tactile guide paths are provided to guide them through PDX. Visual paging is available for the hard of hearing, and TDD telephones are also present at PDX.

  • Which airlines have lounges at Portland International Airport?

    Alaska Airlines, United Airlines, and Delta have lounges at PDX. Delta runs the only members-only lounge at PDX, while the other two options you can access by paying at the door. To access these lounges, you must show your flight ticket and pay a one-time fee. The Delta lounge is on Concourse D airside, Alaska lounge is on Concourse C airside, and United Club is on Concourse E airside. The airport also has a USO lounge for active US military members landside on the mezzanine level.

  • Does Portland International Airport offer family services?

    PDX offers nursing rooms for mothers who are traveling with infants. The nursing rooms provide comfortable seating, fold-down tables, and power outlets. The PDX nursing facilities are airside near the south lobby and around Gate D2. The airport has also provided a children’s play area for passengers with older kids. The PDX play areas are two, and they are both airside around Gates C17 and D7.

  • What is the cheapest flight from St. Louis to Portland?

    In the last 3 days, the lowest price for a flight from St. Louis to Portland was $45 for a one-way ticket and $127 for a round-trip.

  • Do I need a passport to fly between St. Louis and Portland?

    No

  • Which airports will I be using when flying from St. Louis to Portland?

    St. Louis and Portland are both served by 1 main airport. You will leave St. Louis from Lambert-St Louis and will be arriving at Portland.

  • Which aircraft models fly most regularly from St. Louis to Portland?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Portland?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between St. Louis and Portland, with oneworld being the most commonly used for this route.

  • What is the most popular layover when flying to Portland from St. Louis?

    Denver is the most popular layover city among KAYAK users traveling from St. Louis to Portland.

  • Which is the best airline for flights from St. Louis to Portland, Delta or Alaska Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Portland are Delta and Alaska Airlines. With an average price for the route of $421 and an overall rating of 8.0, Delta is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $408 and an overall rating of 8.0.

  • How does KAYAK find such low prices on flights from St. Louis to Portland?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Portland.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Portland?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Portland from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Portland?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Portland with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and PDX can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Portland?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Portland from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding a cheap flight from STL to Portland

  • St. Louis Lambert International Airport (STL) comprises two terminals and five concourses, A to E. The airport has provided courtesy shuttles for inter-terminal transportation, which run every 5-10min.
  • STL welcomes all pets to the airport. The airport has provided six relief areas: four indoors and two outdoors. The indoor areas are airside, and the outdoor areas are outside Terminal 2 and on the upper west side of Terminal 1.
  • Around 1,084 kg of carbon is emitted on flights from St. Louis to Portland. You can fly more sustainably with Frontier Airlines; they offer a flight emitting 60% less carbon per passenger.
  • Unwind after your flight with a holistic massage or facial at the Dragontree Spa at Portland International Airport (PDX). The spa is open between 9 am and 8 pm and is on Concourse C airside.
  • US Bank has a full-service branch at STL for those in need of banking or currency exchange services. The bank is open weekdays from 8 am to 5 pm and sits on the lower level of Terminal 1.
See more tips

Prefer to fly non-stop from St. Louis to Portland?

Find which airlines fly direct from Lambert-St Louis to Portland, which days they fly and book direct flights.

Nonstop departures

Lambert-St Louis to Portland

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights

Nonstop returns

Portland to Lambert-St Louis

Saturday

Southwest

Southwest

Sunday

Southwest

Southwest

See more direct flights
See more direct flights

Top 5 airlines serving from St. Louis to Portland

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Portland. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Portland? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 9115 reviews
8.6crew
8.2boarding
7.3food
7.9comfort
7.3entertainment
Airline reviews

I liked the fast internet and twice serving of snacks and drinks. Paid food options could have included more.

10.0 ExcellentMatthew, Apr 2024ORD - PDX
Read more about Alaska Airlines reviews

I liked the fast internet and twice serving of snacks and drinks. Paid food options could have included more.

I appreciated the ability to choose between multiple flights both into and out of Portland from Burbank on the same day, so we were able to attend an event and return without spending the night. I am unable to appreciate what Alaska Air calls "streamlining" the checkin/boarding process at Burbank Airport. If you have a smartphone and the Alaska Air app, it is probably fine, but removing the option of using onsite kiosks to print boarding passes does not meet my definition of "streamlined". I also found it challenging that both Portland and Burbank airports required the plane to sit on the runway for some time due to lack of an open gate at which to disembark. It would not be so bad if we could at least remove our seat belts and move a little bit while we waited, but that is not an option. I honestly don't know whether this is because of how Alaska Air operates, or just the circumstances of the particular day and airports we were using, but I normally do not experience these kinds of delays to reach a gate using Southwest Air.

I was not given a seat when I bought the ticket. I know airlines are trying to squeeze every penny out ot the customer, but we are buying a seat on the airplane, right? I find this irritating with all airlines, but especially Alaska because I fly it so often. No sense of customer use and loyalty.

It was adequate nothing special no entertain because flight was short. Crew pleasant.

All employees were very nice and I was very comfortable

Loved the gate agent and flight attendants. All were extremely helpful.

It was a good flight, wish they would have handed out snacks though.

Multiple delays and when we landed zero help getting to and making connecting flight.

There were no gluten free snacks and it wasn’t clear how to access entertainment.

Seat space Terrible. No real food on a 6 hour flight

Delta is one of the best airlines I have flown

Made the Atlanta to Pittsburgh trip many times, with Delta no issues

I always fly with Delta. My friends tell me their horror stories of flying with other airlines. I just smile and say, “You should fly Delta”

I'm a larger, athletic guy (6'2", 260lbs powerlifter) and I found the seats incredibly uncomfortable with minimal leg room, especially in a window seat. Now, I full understand that being smaller may change my view but even if I was 80lbs less, my legs would be the same size and I was sandwiched between my seat and the seat in front of me.

Horrible. This was not first class. This was a connecting flight whi h was late. My original flight never came. I hated the fact that delta gave me a connecting flight from New York to Orlando Florida. No meals and the television screens were not working. There wasn't even any power to charge your phones. This is NOT FIRST CLASS DELTA!!! Do better next time!

This flight was ridiculous. I had to have a connecting flight from New York to orlando Florida??? The flight left late and because it was a short flight there was no first class amenities. I had one alcohol drink. The flight crew was fine, but it sure did not feel like first class. Delta to me dropped the ball by giving me a connecting flight. By the time we got to Raleigh we would have missed the next flight. Lucky for me the flight never came so now I was stuck waiting for a later flight that came in late also.

Our flight was delayed in Atlanta. The staff could have gave us an explanation for the delay and how long it would be.

I liked the ease of checking in, luggage check in, wheel chair assistance, boarding and flight.

On my way home I had a layover. The flight from ATL to CLT was amended 5x while I was waiting. I could have driven home sooner. Overall from Dallas, Tx to Charlotte, NC I started my trip at 4:30pm, I didn’t get home until past midnight. I know things happen, but 5x to make me run back and forth in an airport from different terminals is excessive. I also upgraded to comfort + , I didn’t feel it was worth it. There was no benefit

On my way home I had a layover. The flight from ATL to CLT was amended 5x while I was waiting. I could have driven home sooner. Overall from Dallas, Tx to Charlotte, NC I started my trip at 4:30pm, I didn’t get home until past midnight. I know things happen, but 5x to make me run back and forth in an airport from different terminals is excessive.

So so. Terrible aircraft choice for that leg of the flight.

Due to one crew member not showing up to work, our flight was significantly delayed causing us to miss our connecting flight in Houston to Mississippi causing us to be delayed by more than 6 hours and missing our event all together. Very disappointing. All because ONE crew member called in sick. United did grant us a $15 meal voucher, which was a small but appreciated concession that I wasn’t able to use because I ordered my lunch and paid for it before applying the concession, and the staff said it was too late to use it. Ugh! We also had a TWO delay coming back from Mississippi, but that was on American Airlines and it was due to weather, so not their fault. Anyway, not at all impressed with United’s handling of our flight and the HUGE disappointment of missing our important family event for our 90 year old mother. All that money and all that stress and emotions for nothing. Having to wait the hour to bring an employee from LAX seemed like something that should not have happened. Why don’t you have a local back-up? Santa Ana is not a little airport in a rural area.

Flight delayed from Cape Town to Washington then got diverted to miami and in miami we had to fend for ourselves , im still trying to get to Shreveport now

delay several times and wait extra long to board. no entertainment service because there are problem for some rows. always encounter some delays for the last flight of the day.

I just wrote a text which was supposed to be for the flight from Denver to spokane not Frankfurt to Denver.

On time every leg of the journey and exceptional staff at counter, gate, and on board. I haven’t travelled in US for a long time and was genuinely surprised how pleasant this was.

The delays (5 hrs) were a comedy of errors, and the multiple safety issues encountered were very concerning.

flight delays, staff only communicating when pushed, food service lasting a grand total of 7 minutes, stuck in seat from 45mins into flight until landing

Crew was great and did their best to make us comfortable and captain came out at the beginning to announce why the flight was delayed, weather situation up ahead, and kept us updated throughout the flight.

they made me check my carryon. There was space in the overhead bins.

Flight delayed over an over all day until it cancelled at 1:30am. Would not repeatedly delay that late. Offer hotel rooms and rebook early. Very difficult for families with small children

this is starting to seem like an american airlines standard. delayed flights and fake apologies… getting tired of it

This flight is frequently delayed. The connections seemingly are more frequently delayed. I’ve missed connections as a result twice on the same route to charlotte then Charleston. Final destination arrival has been the next day, twice in a row. No pilots, no crew. Too many excuses. Unfortunately, my days with American are over.

Entertainment was okay not because anything was wrong but it is a short flight so having no wifi is annoying but understandable. Crew was outstanding as usual

Those seats were way too narrow. I had the middle seat, one person was a very skinny person and we still couldn’t avoid touching each other anytime one of us moved. The other person was larger and we were basically sitting in each others lap the entire flight. There was zero entertainment. The flight was long enough to justify tvs, but no. Gotta sit there in your infant seat and twiddle your thumbs.

The Flight attendant had an attitude and didn't allow anyone any time to prepare for landing despite being absent throughout the entire trip

Flight boarded without pilots. Sat on plane for 3 hrs. after over an hour late boarding. Plane never took off. Had to deplane near midnight. Line for rebooking was 3 hours + long. I had to leave.

The flight was great but board was a nightmare. The gate was changed 4 times during the layover period

The experience was great and much better than the flight going out. of course I was in first class but the service was excellent

Cold air blew constantly on my legs almost making me numb.

I purchased a carry on bag online…was supposed to cost $72 but after a whole slew of bs charges, the total was over $175.00. Because of these hidden charges, I will not even consider flying Frontier ever again. It’s just not worth the hassle. I’m scratching this company off my list forever.

Flight was OK. Seats were good no cell phone charges on the plane no TVs or entertainment.

There were 3 leg for the trip and each leg was delayed by 90 minutes or more. The boarding process takes forever with people waiting on the jetway even though most folks do not have carry-on. The whole process is poorly managed.

Flight cancelled and was told by a rude gate agent that they don’t accommodate on other airlines. Had to wait 5 hours for a connecting flight that had a 7 hour layover. Would not allow bags to be checked early so we couldn’t go through security .Had to rent a car for the afternoon to store bags and get a meal. Also incurred a hotel fee. No apology or reason given for the cancellation- just rudeness.

They cancelled the flight then did nothing to help us rebook. It was awful - I won’t fly with them again

The process of buying the ticket and navigating all the hidden charges that Frontier throws at you was a terrible experience. The actual airport experience and flying was fine.

The truck that was refueling the plane drove away with the hose still connected to the plane and ripped part of the plane off with it

Not have to pay for every single item to take a flight. Seating and delays sucked.

Flight was cancelled and I had to spend the night in the airport lugging my suitcase around

If you don’t check in 24 hours in advance, they will charge you $110 to check your bag instead of the $30. I did not get an email with this information and did not check in. In addition, my flight home was cancelled at layover and I had to spend the night in the airport, and then have another layover at another airport before making it home. Will not fly frontier again.

Book cheap flights from St. Louis to Portland

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from St. Louis to Portland found on KAYAK in the last 72 hours.
5/15Wed
1 stopSpirit Airlines
14h 31mSTL-PDX
$45
5/15Wed
1 stopFrontier
12h 44mSTL-PDX
$81
5/15Wed
1 stopAmerican Airlines
9h 31mSTL-PDX
$161
8/18Sun
1 stopAmerican Airlines
8h 37mSTL-PDX
$168
6/25Tue
2 stopsDelta
10h 46mSTL-PDX
$191
5/26Sun
2 stopsAlaska Airlines
14h 17mSTL-PDX
$278
5/15Wed
2 stopsAlaska Airlines
11h 15mSTL-PDX
$289
8/18Sun
2 stopsUnited Airlines
16h 16mSTL-PDX
$304
5/15Wed
2 stopsUnited Airlines
23h 55mSTL-PDX
$343
6/28Fri
2 stopsDelta
8h 16mSTL-PDX
$392

Search by stops

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Last minute flights from St. Louis to Portland

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from St. Louis to Portland that are departing in the next 10 days.
4/30Tue
multi-stop
9h 09mSTL-PDX
5/7Tue
multi-stop
27h 14mPDX-STL
$175
5/1Wed
multi-stopFrontier
15h 19mSTL-PDX
5/7Tue
multi-stopFrontier
6h 48mPDX-STL
$207
4/30Tue
multi-stopFrontier
9h 09mSTL-PDX
5/5Sun
multi-stopFrontier
6h 48mPDX-STL
$208
5/1Wed
multi-stopAmerican Airlines
7h 16mSTL-PDX
5/8Wed
multi-stopAmerican Airlines
7h 52mPDX-STL
$276
4/29Mon
multi-stopAmerican Airlines
7h 16mSTL-PDX
5/1Wed
multi-stopAmerican Airlines
6h 57mPDX-STL
$282
5/1Wed
multi-stopSpirit Airlines
25h 41mSTL-PDX
5/8Wed
multi-stopSpirit Airlines
26h 24mPDX-STL
$305
4/29Mon
multi-stopDelta
6h 36mSTL-PDX
5/4Sat
multi-stopDelta
8h 09mPDX-STL
$329
4/29Mon
multi-stopDelta
7h 49mSTL-PDX
4/30Tue
multi-stopDelta
8h 01mPDX-STL
$336
5/1Wed
multi-stopSpirit Airlines
25h 41mSTL-PDX
5/8Wed
multi-stopSpirit Airlines
27h 35mPDX-STL
$356
4/29Mon
multi-stopAlaska Airlines
9h 17mSTL-PDX
5/1Wed
multi-stopAlaska Airlines
13h 54mPDX-STL
$592

Search by stops

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Search by price

St. Louis - Portland Flights

Departure:

St. Louis (STL)United States

Destination:

Portland (PDX)United States

Return flight deals:

Portland - St. Louis

Cabin classes: