$66+ 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 4/24. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — STL
Mar 17 — Mar 241
1 adult, Economy
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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 15, 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 15, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/12. 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.
Thu 4/1611:48 am
PDX
- STL
1 stop29h 24m
Frontier
Sat 4/188:12 pm
STL
- PDX
1 stop16h 51m
Frontier
Deal found 2/12![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 2/13. 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
Wed 3/188:12 pm
STL
- PDX
1 stop16h 57m
Frontier
Deal found 2/13![Frontier logo]()
$202
This American Airlines deal was found by Cheapflights users on 2/14. 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 4/1611:40 pm
PDX
- STL
1 stop7h 14m
American Airlines
Sat 4/182:33 pm
STL
- PDX
1 stop11h 24m
American Airlines
Deal found 2/14![American Airlines logo]()
$222
This Alaska Airlines deal was found by Cheapflights users on 2/12. 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 Alaska Airlines 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 5/276:20 pm
STL
- PDX
Nonstop4h 17m
Alaska Airlines
Deal found 2/12![Alaska Airlines logo]()
$229
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 15, 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 15, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/14. 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.
Thu 4/1611:48 am
PDX
- STL
2 stops24h 24m
Frontier
Sat 4/188:12 pm
STL
- PDX
1 stop16h 51m
Frontier
Deal found 2/14![Frontier logo]()
$183
This Alaska Airlines deal was found by Cheapflights users on 2/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2110:37 am
PDX
- STL
Nonstop4h 00m
Alaska Airlines
Wed 5/275:33 pm
STL
- PDX
Nonstop4h 17m
Alaska Airlines
Deal found 2/15![Alaska Airlines logo]()
$229
This United Airlines deal was found by Cheapflights users on 2/12. 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.
Fri 5/157:45 pm
PDX
- STL
1 stop8h 02m
United Airlines
Wed 5/205:59 pm
STL
- PDX
1 stop6h 55m
United Airlines
Deal found 2/12![United Airlines logo]()
$244
This Delta deal was found by Cheapflights users on 2/15. 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 3/315:02 pm
PDX
- STL
1 stop5h 19m
Delta
Fri 4/32:12 pm
STL
- PDX
1 stop6h 10m
Delta
Deal found 2/15![Delta logo]()
$249
This American Airlines deal was found by Cheapflights users on 2/11. 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 4/111:59 pm
PDX
- STL
1 stop6h 56m
American Airlines
Mon 4/66:00 am
STL
- PDX
1 stop6h 48m
American Airlines
Deal found 2/11![American Airlines logo]()
$249
This United Airlines deal was found by Cheapflights users on 2/13. 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.
Fri 3/1311:59 pm
PDX
- STL
1 stop8h 37m
United Airlines
Fri 3/205:15 am
STL
- PDX
1 stop6h 39m
United Airlines
Deal found 2/13![United Airlines logo]()
$249
This American Airlines deal was found by Cheapflights users on 2/11. 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 4/2712:59 am
PDX
- STL
1 stop8h 38m
American Airlines
Tue 5/55:21 pm
STL
- PDX
1 stop7h 21m
American Airlines
Deal found 2/11![American Airlines logo]()
$249
This United Airlines deal was found by Cheapflights users on 2/11. 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.
Wed 7/154:10 pm
PDX
- STL
1 stop5h 48m
United Airlines
Tue 7/214:50 pm
STL
- PDX
1 stop8h 05m
United Airlines
Deal found 2/11![United Airlines logo]()
$249
This United Airlines deal was found by Cheapflights users on 2/12. 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 4/911:59 pm
PDX
- STL
1 stop6h 36m
United Airlines
Wed 4/157:45 am
STL
- PDX
1 stop9h 24m
United Airlines
Deal found 2/12![United Airlines logo]()
$249
This United Airlines deal was found by Cheapflights users on 2/13. 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 5/710:55 pm
PDX
- STL
1 stop7h 44m
United Airlines
Tue 5/126:00 am
STL
- PDX
1 stop8h 43m
United Airlines
Deal found 2/13![United Airlines logo]()
$249
Last-minute flights from Portland to St. LouisDiscover last-minute flight deals from Portland to St. Louis. Data last updated February 15, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to St. Louis. Data last updated February 15, 2026 and is based on user searches.
This Expedia deal was found by Cheapflights users on 2/12. 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.
Mon 3/23:52 pm
PDX
- STL
1 stop6h 07m
Multiple Airlines
Thu 3/510:11 pm
STL
- PDX
1 stop13h 02m
Multiple Airlines
Deal found 2/12![Multiple Airlines logo]()
$283
This American Airlines deal was found by Cheapflights users on 2/15. 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 3/43:10 pm
PDX
- STL
1 stop6h 49m
American Airlines
Mon 3/94:13 pm
STL
- PDX
1 stop8h 56m
American Airlines
Deal found 2/15![American Airlines logo]()
$293
This Kiwi.com deal was found by Cheapflights users on 2/15. 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 2/15![Frontier logo]()
$269
This Delta deal was found by Cheapflights users on 2/11. 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.
Mon 3/95:02 pm
PDX
- STL
1 stop5h 19m
Delta
Thu 3/126:12 pm
STL
- PDX
1 stop7h 42m
Delta
Deal found 2/11![Delta logo]()
$288
This Kiwi.com deal was found by Cheapflights users on 2/11. 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.
Thu 3/1212:04 pm
PDX
- STL
1 stop19h 45m
Frontier
Mon 3/168:10 pm
STL
- PDX
2 stops38h 48m
Frontier
Deal found 2/11![Frontier logo]()
$291
This Kiwi.com deal was found by Cheapflights users on 2/13. 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
Fri 3/208:12 pm
STL
- PDX
2 stops17h 40m
Frontier
Deal found 2/13![Frontier logo]()
$286
This American Airlines deal was found by Cheapflights users on 2/13. 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.
Sat 3/1411:59 pm
PDX
- STL
1 stop6h 39m
American Airlines
Tue 3/174:13 pm
STL
- PDX
1 stop7h 49m
American Airlines
Deal found 2/13![American Airlines logo]()
$249
This Kiwi.com deal was found by Cheapflights users on 2/13. 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
Wed 3/188:12 pm
STL
- PDX
1 stop16h 57m
Frontier
Deal found 2/13![Frontier logo]()
$202
This Expedia deal was found by Cheapflights users on 2/14. 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.
Sun 3/1512:52 pm
PDX
- STL
1 stop20h 27m
Frontier
Sun 3/2210:47 pm
STL
- PDX
1 stop12h 11m
Frontier
Deal found 2/14![Frontier logo]()
$250
This Delta deal was found by Cheapflights users on 2/11. 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 3/186:05 am
PDX
- STL
1 stop6h 19m
Delta
Mon 3/236:12 pm
STL
- PDX
1 stop7h 42m
Delta
Deal found 2/11![Delta logo]()
$259
This Delta deal was found by Cheapflights users on 2/12. 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 3/275:02 pm
PDX
- STL
1 stop5h 19m
Delta
Tue 3/311:39 pm
STL
- PDX
1 stop10h 14m
Delta
Deal found 2/12![Delta logo]()
$278
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 15, 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 15, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/12. 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 4/2411:48 am
PDX
- STL
1 stop29h 24m
Frontier
Deal found 2/12![Frontier logo]()
$66
This Kiwi.com deal was found by Cheapflights users on 2/13. 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.
Wed 4/221:48 pm
PDX
- STL
1 stop27h 24m
Frontier
Deal found 2/13![Frontier logo]()
$77
This Trip.com deal was found by Cheapflights users on 2/11. 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 2/11![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 2/12. 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.
Thu 4/1611:48 am
PDX
- STL
1 stop29h 24m
Frontier
Deal found 2/12![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 2/13. 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 4/1911:48 am
PDX
- STL
1 stop29h 24m
Frontier
Deal found 2/13![Frontier logo]()
$100
This Kiwi.com deal was found by Cheapflights users on 2/13. 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.
Thu 4/2311:48 am
PDX
- STL
1 stop29h 24m
Frontier
Deal found 2/13![Frontier logo]()
$102
This American Airlines deal was found by Cheapflights users on 2/15. 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.
Sat 5/26:22 am
PDX
- STL
1 stop11h 47m
American Airlines
Deal found 2/15![American Airlines logo]()
$103
This Trip.com deal was found by Cheapflights users on 2/13. 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.
Sat 5/912:27 pm
PDX
- STL
1 stop28h 45m
Frontier
Deal found 2/13![Frontier logo]()
$104
This Kiwi.com deal was found by Cheapflights users on 2/12. 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.
Wed 4/151:48 pm
PDX
- STL
1 stop27h 24m
Frontier
Deal found 2/12![Frontier logo]()
$105
This Kiwi.com deal was found by Cheapflights users on 2/13. 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.
Wed 4/291:48 pm
PDX
- STL
1 stop27h 24m
Frontier
Deal found 2/13![Frontier logo]()
$106
This CheapOair deal was found by Cheapflights users on 2/13. 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 5/131:48 pm
PDX
- STL
1 stop27h 24m
Frontier
Deal found 2/13![Frontier logo]()
$107
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 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $161 (Kiwi.com) |
One-way from | $66 (Kiwi.com) |
Popular in | March |
Cheapest in | November |
Average price | $376 |
Good round-trip deal | $249 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 15, 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
Thu 4/16
11:48 am-2:12 pm
2 stops24h 24m
Lambert-St Louis
Sat 4/18
8:12 pm-11:03 am
1 stop16h 51m
$183
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Thu 5/21
10:37 am-4:37 pm
Nonstop4h 00m
Lambert-St Louis
Wed 5/27
5:33 pm-7:50 pm
Nonstop4h 17m
$229
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Fri 5/15
7:45 pm-5:47 am
1 stop8h 02m
Lambert-St Louis
Wed 5/20
5:59 pm-10:54 pm
1 stop6h 55m
$244
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Tue 3/31
5:02 pm-12:21 am
1 stop5h 19m
Lambert-St Louis
Fri 4/3
2:12 pm-6:22 pm
1 stop6h 10m
$249
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Wed 4/1
11:59 pm-8:55 am
1 stop6h 56m
Lambert-St Louis
Mon 4/6
6:00 am-10:48 am
1 stop6h 48m
$249
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Fri 3/13
11:59 pm-10:36 am
1 stop8h 37m
Lambert-St Louis
Fri 3/20
5:15 am-9:54 am
1 stop6h 39m
$249
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Mon 4/27
12:59 am-11:37 am
1 stop8h 38m
Lambert-St Louis
Tue 5/5
5:21 pm-10:42 pm
1 stop7h 21m
$249
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Wed 7/15
4:10 pm-11:58 pm
1 stop5h 48m
Lambert-St Louis
Tue 7/21
4:50 pm-10:55 pm
1 stop8h 05m
$249
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Thu 4/9
11:59 pm-8:35 am
1 stop6h 36m
Lambert-St Louis
Wed 4/15
7:45 am-3:09 pm
1 stop9h 24m
$249
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Thu 5/7
10:55 pm-8:39 am
1 stop7h 44m
Lambert-St Louis
Tue 5/12
6:00 am-12:43 pm
1 stop8h 43m
$249
Showing 1-10 of 21 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 February 13, 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 March 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.
How much does it cost to fly round-trip from Portland to St. Louis?
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 15, 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.
Overall
8.0
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
8.0
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
8.0
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
8.0
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
8.0
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Overall
8.0
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
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
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Portland and St. Louis flights
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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 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$139 | Average$281 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$184 | Average$366 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$226 | Average$396 | 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% |