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Cheap flights from Portland to St. Louis from $68

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to St. Louis departing on 1/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Portland to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
12:05 pm - 10:02 am
PDX
-
STL
19h 57m1 stop
Frontier Logo
3:43 pm - 11:04 am
STL
-
PDX
21h 21m1 stop
$141Frontier
Thu, Jan 8 - Wed, Jan 14
Frontier Logo
12:05 pm - 7:50 am
PDX
-
STL
17h 45m2 stops
Frontier Logo
3:43 pm - 11:04 am
STL
-
PDX
21h 21m1 stop
$188Frontier
Thu, Jan 8 - Wed, Jan 14
Frontier Logo
6:34 pm - 10:02 am
PDX
-
STL
13h 28m2 stops
Frontier Logo
3:43 pm - 11:04 am
STL
-
PDX
21h 21m1 stop
$192Frontier
Fri, Jan 9 - Wed, Jan 14
Frontier Logo
12:05 pm - 10:02 am
PDX
-
STL
19h 57m1 stop
Frontier Logo
9:46 pm - 9:34 am
STL
-
PDX
13h 48m1 stop
$204Frontier
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
12:05 pm - 10:02 am
PDX
-
STL
19h 57m1 stop
Frontier Logo
12:37 pm - 9:34 am
STL
-
PDX
22h 57m1 stop
$208Frontier
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
12:05 pm - 10:02 am
PDX
-
STL
19h 57m1 stop
Frontier Logo
9:46 pm - 5:39 pm
STL
-
PDX
21h 53m2 stops
$227Frontier
Thu, Jan 8 - Sun, Jan 11
Delta Logo
1:39 pm - 9:35 pm
PDX
-
STL
5h 56m1 stop
Delta Logo
6:10 am - 12:46 pm
STL
-
PDX
8h 36m1 stop
$249Delta
Fri, Jan 9 - Wed, Jan 14
Delta Logo
7:10 am - 9:35 pm
PDX
-
STL
12h 25m2 stops
Delta Logo
6:10 am - 12:46 pm
STL
-
PDX
8h 36m1 stop
$252Delta
Wed, Jan 7 - Wed, Jan 14
United Airlines Logo
12:59 pm - 10:00 pm
PDX
-
STL
7h 01m1 stop
United Airlines Logo
6:30 am - 2:46 pm
STL
-
PDX
10h 16m2 stops
$254United Airlines
Tue, Jan 13 - Sat, Jan 17
Frontier Logo
6:34 pm - 10:02 am
PDX
-
STL
13h 28m2 stops
Frontier Logo
9:46 pm - 9:34 am
STL
-
PDX
13h 48m1 stop
$255Frontier
Fri, Jan 9 - Sun, Jan 11

Frontier flights from Portland to St. Louis

Our best Frontier deals on Portland to St. Louis flight tickets
Frontier
Jan 8
PDX12:05 pmPortland
19h 57m
1 stop
STL10:02 amLambert-St Louis
Jan 14
STL3:43 pmLambert-St Louis
21h 21m
1 stop
PDX11:04 amPortland
$141
Find similar
Frontier
Jan 8
PDX12:05 pmPortland
17h 45m
2 stops
STL7:50 amLambert-St Louis
Jan 14
STL3:43 pmLambert-St Louis
21h 21m
1 stop
PDX11:04 amPortland
$188
Find similar
Frontier
Jan 9
PDX6:34 pmPortland
13h 28m
2 stops
STL10:02 amLambert-St Louis
Jan 14
STL3:43 pmLambert-St Louis
21h 21m
1 stop
PDX11:04 amPortland
$192
Find similar

United Airlines flights from Portland to St. Louis

Our best United Airlines deals on Portland to St. Louis flight tickets
United Airlines
Jan 13
PDX12:59 pmPortland
7h 01m
1 stop
STL10:00 pmLambert-St Louis
Jan 17
STL6:30 amLambert-St Louis
10h 16m
2 stops
PDX2:46 pmPortland
$254
Find similar
United Airlines
Jan 9
PDX12:59 pmPortland
7h 01m
1 stop
STL10:00 pmLambert-St Louis
Jan 11
STL6:00 amLambert-St Louis
8h 18m
1 stop
PDX12:18 pmPortland
$273
Find similar
United Airlines
Mar 3
PDX12:57 pmPortland
7h 17m
1 stop
STL10:14 pmLambert-St Louis
Mar 4
STL7:41 amLambert-St Louis
9h 46m
1 stop
PDX3:27 pmPortland
$339
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Portland to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 8, 2025.
Use the filters below to find and compare flights from Portland to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 1/8

12:05 pm-10:02 am

1 stop19h 57m

Lambert-St Louis

Wed 1/14

3:43 pm-11:04 am

1 stop21h 21m

$141

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 1/8

12:05 pm-7:50 am

2 stops17h 45m

Lambert-St Louis

Wed 1/14

3:43 pm-11:04 am

1 stop21h 21m

$188

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 1/9

6:34 pm-10:02 am

2 stops13h 28m

Lambert-St Louis

Wed 1/14

3:43 pm-11:04 am

1 stop21h 21m

$192

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 1/8

12:05 pm-10:02 am

1 stop19h 57m

Lambert-St Louis

Sun 1/11

9:46 pm-9:34 am

1 stop13h 48m

$204

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 1/8

12:05 pm-10:02 am

1 stop19h 57m

Lambert-St Louis

Sun 1/11

12:37 pm-9:34 am

1 stop22h 57m

$208

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 1/8

12:05 pm-10:02 am

1 stop19h 57m

Lambert-St Louis

Sun 1/11

9:46 pm-5:39 pm

2 stops21h 53m

$227

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 1/9

1:39 pm-9:35 pm

1 stop5h 56m

Lambert-St Louis

Wed 1/14

6:10 am-12:46 pm

1 stop8h 36m

$249

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 1/7

7:10 am-9:35 pm

2 stops12h 25m

Lambert-St Louis

Wed 1/14

6:10 am-12:46 pm

1 stop8h 36m

$252

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Tue 1/13

12:59 pm-10:00 pm

1 stop7h 01m

Lambert-St Louis

Sat 1/17

6:30 am-2:46 pm

2 stops10h 16m

$254

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Fri 1/9

6:34 pm-10:02 am

2 stops13h 28m

Lambert-St Louis

Sun 1/11

9:46 pm-9:34 am

1 stop13h 48m

$255

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Portland to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

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

In general, January is the cheapest month to fly from Portland to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $273. The month of November is another great option to travel to St. Louis, with average flight prices from Portland averaging around $300.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Tuesday when prices can be found for as low as $379. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $621. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Portland in the evening is the least expensive time of day to depart. momondo users have found prices as low as $288 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $679 per ticket.

What is the cheapest Portland to Lambert-St Louis flight route?

Fly from Portland to Lambert-St Louis for the best Portland - Lambert-St Louis flight prices

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

You are more likely to see cheaper flights to St. Louis from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $372 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Portland for as low as $245 on momondo.

What cabin class options are available on Portland to Lambert-St Louis flights?

There is only 1 cabin class available to choose from on Portland to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Portland to St. Louis flight prices changed over time?

As of December 2025, prices for Portland to St. Louis flights are approximately 0% more expensive when compared to flights at the same time last year.

When to book flights from Portland to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Portland to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland to St. Louis (PDX to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland to St. Louis

Best Price Found

$249

Fastest flight time

5h 10m

Direct flights

Mon, Thu, Fri and Sun

Airports in St. Louis

1 airport
The best flight deal from Portland to St. Louis found on momondo in the last 72 hours is $249
The fastest flight from Portland to St. Louis takes 5h 10m
Direct flights go from Portland to St. Louis on Monday, Thursday, Friday and Sunday. There are no airlines offering direct flights.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
Search flight deals

  • How far is Portland to Lambert-St Louis by plane?

    A flight from Portland to Lambert-St Louis will travel around 1718.1 mi. A reasonable flight in good conditions will take 3h 48m.

  • When did momondo last update prices for flights from Portland Airport to Lambert-St Louis Airport?

    Prices for flights from Portland Airport to Lambert-St Louis Airport are updated daily.

  • How many operators does momondo search for flights from Portland Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Portland Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Portland Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Portland to St. Louis?

  • What is the most popular airline from Portland to St. Louis?

Best airlines flying from Portland to St. Louis

Compare and see reviews for airlines that fly from Portland to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $158Free CancellationRating
5.8
3,085 reviews
Search Frontier flights
DeltaPriceFrom $221Free CancellationRating
7.9
8,011 reviews
Search Delta flights
American AirlinesPriceFrom $226Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
9,089 reviews
Search United Airlines flights
SouthwestPriceFrom $248Free CancellationRating
8.0
4,254 reviews
Search Southwest flights
Alaska AirlinesPriceFrom $265Free CancellationRating
8.0
11,419 reviews
Search Alaska Airlines flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
Fenton
Wentzville
St. Peters
Collinsville
Alton
Farmington
Festus
Clayton
Glencoe
Edwardsville
Eureka
Litchfield
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from Portland to St. Louis?

It is quick and easy to find Portland to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

Can I find flights from Portland to St. Louis with flexible booking policies on momondo?

momondo does allow users to show only those flights to St. Louis from Portland which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Portland to St. Louis?

Once you have performed a search for Portland to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Portland to St. Louis right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Portland to St. Louis flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your St. Louis trip

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