$60+ Cheap flights from Portland to St. Louis (PDX - STL)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/6. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — STL
Mar 5 — Mar 121
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Portland to St. Louis with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Portland to Lambert-St Louis are usually found in November or September, booked 76 days in advance, depart on a Monday or Tuesday and return on a Monday
Cheap flight deals from Portland to St. Louis
Cheapest
Best
Last-minute
One-way
Cheapest flights from Portland to St. LouisExplore the most affordable flight options available from Portland to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 3, 2026.
Explore the most affordable flight options available from Portland to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/612:04 pm
PDX
- STL
1 stop19h 45m
Frontier
Sun 3/86:19 pm
STL
- PDX
1 stop16h 54m
Frontier
Deal found 2/2![Frontier logo]()
$183
This CheapOair deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/151:48 pm
PDX
- STL
1 stop27h 24m
Frontier
Sat 4/188:12 pm
STL
- PDX
1 stop16h 51m
Frontier
Deal found 2/1![Frontier logo]()
$222
This Expedia deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/911:25 am
PDX
- STL
Nonstop3h 48m
Alaska Airlines
Sat 9/126:20 pm
STL
- PDX
Nonstop4h 10m
Alaska Airlines
Deal found 2/1![Alaska Airlines logo]()
$229
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/312:57 pm
PDX
- STL
1 stop7h 17m
United Airlines
Wed 3/49:55 am
STL
- PDX
1 stop7h 32m
United Airlines
Deal found 2/2![United Airlines logo]()
$244
This American Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/911:40 pm
PDX
- STL
1 stop7h 14m
American Airlines
Sat 4/115:46 am
STL
- PDX
1 stop10h 38m
American Airlines
Deal found 2/1![American Airlines logo]()
$246
This United Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1611:59 pm
PDX
- STL
1 stop6h 36m
United Airlines
Sat 4/188:30 am
STL
- PDX
1 stop8h 01m
United Airlines
Deal found 2/3![United Airlines logo]()
$249
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/1312:04 pm
PDX
- STL
1 stop19h 45m
Frontier
Sun 3/158:06 pm
STL
- PDX
2 stops17h 03m
Frontier
Deal found 2/2![Frontier logo]()
$251
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/312:57 pm
PDX
- STL
1 stop7h 17m
United Airlines
Tue 3/105:15 am
STL
- PDX
2 stops9h 18m
United Airlines
Deal found 2/1![United Airlines logo]()
$254
This CheapOair deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/61:48 pm
PDX
- STL
1 stop27h 24m
Frontier
Fri 5/88:12 pm
STL
- PDX
1 stop17h 30m
Frontier
Deal found 1/31![Frontier logo]()
$256
This CheapOair deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2111:18 am
PDX
- STL
Nonstop3h 48m
Alaska Airlines
Wed 5/277:56 pm
STL
- PDX
1 stop6h 15m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$259
Best flights from Portland to St. LouisDiscover carefully curated flight deals from Portland to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 3, 2026.
Discover carefully curated flight deals from Portland to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/612:04 pm
PDX
- STL
1 stop19h 45m
Frontier
Sun 3/87:52 am
STL
- PDX
2 stops29h 17m
Frontier
Deal found 2/2![Frontier logo]()
$248
This Delta deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/112:30 am
PDX
- STL
1 stop6h 31m
Delta
Sun 4/56:12 pm
STL
- PDX
1 stop7h 42m
Delta
Deal found 1/31![Delta logo]()
$249
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/287:30 am
PDX
- STL
1 stop6h 57m
United Airlines
Tue 3/36:25 am
STL
- PDX
1 stop7h 30m
United Airlines
Deal found 2/1![United Airlines logo]()
$249
This American Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/211:40 pm
PDX
- STL
1 stop7h 15m
American Airlines
Mon 3/96:00 am
STL
- PDX
1 stop6h 48m
American Airlines
Deal found 2/2![American Airlines logo]()
$249
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/271:53 pm
PDX
- STL
1 stop7h 30m
Delta
Mon 3/26:40 pm
STL
- PDX
1 stop7h 13m
Delta
Deal found 2/1![Delta logo]()
$249
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1611:59 pm
PDX
- STL
1 stop6h 36m
United Airlines
Sat 4/188:30 am
STL
- PDX
1 stop8h 01m
United Airlines
Deal found 2/1![United Airlines logo]()
$249
This American Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/411:35 pm
PDX
- STL
1 stop8h 28m
American Airlines
Mon 3/94:13 pm
STL
- PDX
1 stop7h 49m
American Airlines
Deal found 2/3![American Airlines logo]()
$274
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/312:57 pm
PDX
- STL
1 stop7h 17m
United Airlines
Tue 3/105:15 am
STL
- PDX
2 stops9h 18m
United Airlines
Deal found 2/1![United Airlines logo]()
$254
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/1412:30 am
PDX
- STL
1 stop6h 31m
Delta
Thu 3/196:12 pm
STL
- PDX
1 stop7h 42m
Delta
Deal found 2/1![Delta logo]()
$273
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/185:02 pm
PDX
- STL
1 stop5h 19m
Delta
Wed 3/253:05 pm
STL
- PDX
1 stop7h 20m
Delta
Deal found 2/1![Delta logo]()
$273
Last-minute flights from Portland to St. LouisDiscover last-minute flight deals from Portland to St. Louis. Data last updated February 3, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to St. Louis. Data last updated February 3, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/287:30 am
PDX
- STL
1 stop6h 57m
United Airlines
Tue 3/36:25 am
STL
- PDX
1 stop7h 30m
United Airlines
Deal found 2/1![United Airlines logo]()
$249
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/312:57 pm
PDX
- STL
1 stop7h 17m
United Airlines
Wed 3/49:55 am
STL
- PDX
1 stop7h 32m
United Airlines
Deal found 2/2![United Airlines logo]()
$244
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/312:57 pm
PDX
- STL
1 stop7h 17m
United Airlines
Tue 3/105:15 am
STL
- PDX
2 stops9h 18m
United Airlines
Deal found 2/1![United Airlines logo]()
$254
This American Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/411:35 pm
PDX
- STL
1 stop8h 28m
American Airlines
Mon 3/94:13 pm
STL
- PDX
1 stop7h 49m
American Airlines
Deal found 2/3![American Airlines logo]()
$274
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/612:04 pm
PDX
- STL
1 stop19h 45m
Frontier
Sun 3/86:19 pm
STL
- PDX
1 stop16h 54m
Frontier
Deal found 2/2![Frontier logo]()
$183
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/1312:04 pm
PDX
- STL
1 stop19h 45m
Frontier
Sun 3/158:06 pm
STL
- PDX
2 stops17h 03m
Frontier
Deal found 2/2![Frontier logo]()
$251
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/1512:04 pm
PDX
- STL
1 stop19h 45m
Frontier
Thu 3/198:06 pm
STL
- PDX
2 stops17h 03m
Frontier
Deal found 2/1![Frontier logo]()
$276
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/185:02 pm
PDX
- STL
1 stop5h 19m
Delta
Wed 3/253:05 pm
STL
- PDX
1 stop7h 20m
Delta
Deal found 2/1![Delta logo]()
$273
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/311:55 pm
PDX
- STL
2 stops8h 26m
Delta
Fri 4/36:12 pm
STL
- PDX
1 stop7h 42m
Delta
Deal found 2/1![Delta logo]()
$281
One-way flights from Portland to St. LouisSearch for one-way flight options from Portland to St. Louis. Find affordable one-way fares based on user searches. Data last updated February 3, 2026.
Search for one-way flight options from Portland to St. Louis. Find affordable one-way fares based on user searches. Data last updated February 3, 2026.
This Trip.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/612:04 pm
PDX
- STL
1 stop19h 45m
Frontier
Deal found 2/2![Frontier logo]()
$60
This Trip.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/1212:04 pm
PDX
- STL
1 stop19h 45m
Frontier
Deal found 2/1![Frontier logo]()
$76
This Trip.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/812:04 pm
PDX
- STL
1 stop19h 45m
Frontier
Deal found 2/2![Frontier logo]()
$96
This CheapOair deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/151:48 pm
PDX
- STL
1 stop27h 24m
Frontier
Deal found 2/3![Frontier logo]()
$107
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/912:52 pm
PDX
- STL
1 stop28h 19m
Frontier
Deal found 2/2![Frontier logo]()
$114
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/111:48 am
PDX
- STL
1 stop29h 24m
Frontier
Deal found 2/3![Frontier logo]()
$117
This Trip.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2710:18 pm
PDX
- STL
1 stop17h 28m
Frontier
Deal found 2/2![Frontier logo]()
$118
This WAYA deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/257:05 am
PDX
- STL
1 stop6h 48m
Multiple Airlines
Deal found 2/2![Multiple Airlines logo]()
$120
Find flight deals from Portland to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $183 (Kiwi.com) |
One-way from | $60 (Trip.com) |
Popular in | March |
Cheapest in | November |
Average price | $372 |
Good round-trip deal | $242 or less |
Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated February 3, 2026.
Use the filters below to find and compare flights from Portland to St. Louis that are best for you.
Fly from
Portland
Fly to
St. Louis
Route
Depart
Return
Price
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Fri 3/6
12:04 pm-9:49 am
1 stop19h 45m
Lambert-St Louis
Sun 3/8
7:52 am-11:09 am
2 stops29h 17m
$248
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Wed 4/1
12:30 am-9:01 am
1 stop6h 31m
Lambert-St Louis
Sun 4/5
6:12 pm-11:54 pm
1 stop7h 42m
$249
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Sat 2/28
7:30 am-4:27 pm
1 stop6h 57m
Lambert-St Louis
Tue 3/3
6:25 am-11:55 am
1 stop7h 30m
$249
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Mon 3/2
11:40 pm-8:55 am
1 stop7h 15m
Lambert-St Louis
Mon 3/9
6:00 am-10:48 am
1 stop6h 48m
$249
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Fri 2/27
1:53 pm-11:23 pm
1 stop7h 30m
Lambert-St Louis
Mon 3/2
6:40 pm-11:53 pm
1 stop7h 13m
$249
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Thu 4/16
11:59 pm-8:35 am
1 stop6h 36m
Lambert-St Louis
Sat 4/18
8:30 am-2:31 pm
1 stop8h 01m
$249
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Tue 3/3
12:57 pm-10:14 pm
1 stop7h 17m
Lambert-St Louis
Tue 3/10
5:15 am-12:33 pm
2 stops9h 18m
$254
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Sat 3/14
12:30 am-9:01 am
1 stop6h 31m
Lambert-St Louis
Thu 3/19
6:12 pm-11:54 pm
1 stop7h 42m
$273
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Wed 3/18
5:02 pm-12:21 am
1 stop5h 19m
Lambert-St Louis
Wed 3/25
3:05 pm-8:25 pm
1 stop7h 20m
$273
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Wed 3/4
11:35 pm-10:03 am
1 stop8h 28m
Lambert-St Louis
Mon 3/9
4:13 pm-10:02 pm
1 stop7h 49m
$274
Showing 1-10 of 20 results
Compare providers for flights from Portland to St. Louis
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to St. Louis in February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star |
- Most accurate provider: When it comes to deals on Portland-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Portland-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Portland-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Portland-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Portland to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Portland with our price prediction graph.
PDX-STL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Portland to St. Louis
How far ahead should I book a flight from Portland to St. Louis?
Use this chart to determine the optimal time to book a round-trip flight from Portland to St. Louis. Price data was last updated on January 30, 2026.
The best time to book flights from Portland to St. Louis is 76 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from Portland to St. Louis?
Currently, December is the cheapest month in which you can book a flight from Portland to St. Louis (average of $165). Flying from Portland to St. Louis in June is currently the most expensive (average of $248). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
Reviews of airlines servicing St. Louis
Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated February 3, 2026.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta from Portland to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.8
Food
7.1
Crew
8.5
Entertainment
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Food
7.1
Crew
8.5
Entertainment
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Food
7.1
Crew
8.5
Entertainment
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Food
7.1
Crew
8.5
Entertainment
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Food
7.1
Crew
8.5
Entertainment
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Food
7.1
Crew
8.5
Entertainment
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Related info for your journey
Find useful and relevant information for your journey from Portland to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsEdwardsville
O'Fallon
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes for Portland to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
Top 6 airlines flying from Portland to St. Louis
Discover the top 6 airlines that operate flights from Portland to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$139 | Average$281 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$189 | Average$368 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$226 | Average$391 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$226 | Average$380 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$242 | Average$425 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$248 | Average$402 | FlexibilityNo cancel fee | On-time63% |