$149+ Cheap flights from Portland to St. Louis (PDX - STL)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — STL
Oct 29 — Nov 51
Round-trip
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 May or January, booked 73 days in advance, depart on a Tuesday or Friday and return on a Tuesday
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 September 29, 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 September 29, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/15:09 pm -
1 stop15h 57m
Mon 12/77:54 pm -
1 stop22h 16m
Deal found 9/27![Frontier logo]()
$286
This Cheapflightsfares deal was found by Cheapflights users on 9/24. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2212:11 pm -
1 stop22h 24m
Wed 10/284:18 pm -
1 stop20h 49m
Deal found 9/24![Frontier logo]()
$336
This Kiwi.com deal was found by Cheapflights users on 9/27. 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 10/2212:11 pm -
1 stop22h 24m
Mon 10/266:35 pm -
2 stops18h 32m
Deal found 9/27![Frontier logo]()
$340
This Cheapflightsfares deal was found by Cheapflights users on 9/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/261:52 pm -
1 stop19h 11m
Thu 12/32:47 pm -
1 stop23h 37m
Deal found 9/28![Frontier logo]()
$356
This Kiwi.com deal was found by Cheapflights users on 9/27. 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.
Tue 11/312:02 pm -
1 stop25h 21m
Wed 11/116:44 pm -
2 stops18h 23m
Deal found 9/27![Frontier logo]()
$364
This Kiwi.com deal was found by Cheapflights users on 9/27. 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.
Tue 11/312:02 pm -
2 stops27h 38m
Wed 12/27:58 pm -
1 stop22h 09m
Deal found 9/27![Frontier logo]()
$366
This Kiwi.com deal was found by Cheapflights users on 9/25. 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 11/211:06 am -
2 stops50h 17m
Wed 11/114:18 pm -
1 stop20h 49m
Deal found 9/25![Frontier logo]()
$369
This Kiwi.com deal was found by Cheapflights users on 9/27. 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.
Tue 11/312:02 pm -
1 stop25h 21m
Mon 11/96:44 pm -
2 stops18h 23m
Deal found 9/27![Frontier logo]()
$370
This Kiwi.com deal was found by Cheapflights users on 9/25. 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 11/511:06 am -
2 stops28h 34m
Wed 11/114:18 pm -
1 stop20h 49m
Deal found 9/25![Frontier logo]()
$381
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 September 29, 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 September 29, 2026.
This Southwest deal was found by Cheapflights users on 9/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2511:35 pm -
1 stop7h 25m
Thu 10/295:05 am -
1 stop6h 45m
Deal found 9/23![Southwest logo]()
$384
This Delta deal was found by Cheapflights users on 9/23. 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.
Thu 11/53:22 pm -
1 stop5h 59m
Mon 11/97:08 am -
1 stop7h 10m
Deal found 9/23![Delta logo]()
$389
This United Airlines deal was found by Cheapflights users on 9/23. 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 11/2411:30 pm -
1 stop7h 25m
Sat 11/289:48 pm -
1 stop6h 20m
Deal found 9/23![United Airlines logo]()
$389
This Delta deal was found by Cheapflights users on 9/27. 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 10/232:20 pm -
1 stop7h 34m
Mon 10/267:00 pm -
1 stop6h 47m
Deal found 9/27![Delta logo]()
$389
This United Airlines deal was found by Cheapflights users on 9/27. 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.
Sun 11/155:00 am -
1 stop5h 38m
Thu 11/194:39 pm -
1 stop8h 30m
Deal found 9/27![United Airlines logo]()
$389
This Southwest deal was found by Cheapflights users on 9/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2611:35 pm -
1 stop7h 50m
Tue 11/38:25 am -
2 stops8h 35m
Deal found 9/24![Southwest logo]()
$394
This Delta deal was found by Cheapflights users on 9/23. 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.
Thu 11/53:22 pm -
1 stop5h 59m
Thu 11/127:00 pm -
1 stop6h 51m
Deal found 9/23![Delta logo]()
$389
This United Airlines deal was found by Cheapflights users on 9/23. 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 11/75:00 am -
1 stop5h 38m
Wed 11/115:00 am -
1 stop8h 47m
Deal found 9/23![United Airlines logo]()
$389
This Southwest deal was found by Cheapflights users on 9/25. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/265:20 am -
1 stop8h 35m
Mon 11/24:00 pm -
2 stops8h 40m
Deal found 9/25![Southwest logo]()
$394
This Southwest deal was found by Cheapflights users on 9/27. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/237:35 am -
1 stop9h 25m
Tue 12/112:40 pm -
2 stops11h 10m
Deal found 9/27![Southwest logo]()
$414
This Delta deal was found by Cheapflights users on 9/27. 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 12/27:38 pm -
2 stops11h 41m
Sun 12/66:32 am -
2 stops14h 26m
Deal found 9/27![Delta logo]()
$428
This Delta deal was found by Cheapflights users on 9/27. 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 11/45:33 am -
1 stop5h 59m
Wed 11/112:20 pm -
2 stops11h 16m
Deal found 9/27![Delta logo]()
$431
Last-minute flights from Portland to St. LouisDiscover last-minute flight deals from Portland to St. Louis. Data last updated September 29, 2026 and is based on user searches.
Discover last-minute flight deals from Portland to St. Louis. Data last updated September 29, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 9/24. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1112:11 pm -
1 stop22h 24m
Sat 10/177:42 pm -
1 stop17h 12m
Deal found 9/24![Frontier logo]()
$396
This Cheapflightsfares deal was found by Cheapflights users on 9/27. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2212:11 pm -
1 stop22h 24m
Mon 10/268:00 pm -
1 stop17h 07m
Deal found 9/27![Frontier logo]()
$286
This Cheapflightsfares deal was found by Cheapflights users on 9/24. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2212:11 pm -
1 stop22h 24m
Wed 10/284:18 pm -
1 stop20h 49m
Deal found 9/24![Frontier logo]()
$336
This Mytrip deal was found by Cheapflights users on 9/24. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2211:06 am -
2 stops28h 34m
Wed 10/286:44 pm -
2 stops23h 58m
Deal found 9/24![Multiple Airlines logo]()
$393
This Mytrip deal was found by Cheapflights users on 9/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2312:25 pm -
2 stops28h 32m
Mon 10/266:35 pm -
2 stops18h 32m
Deal found 9/27![Frontier logo]()
$387
This Delta deal was found by Cheapflights users on 9/27. 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 10/232:20 pm -
1 stop7h 34m
Mon 10/267:00 pm -
1 stop6h 47m
Deal found 9/27![Delta logo]()
$389
This Southwest deal was found by Cheapflights users on 9/23. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2511:35 pm -
1 stop7h 25m
Thu 10/295:05 am -
1 stop6h 45m
Deal found 9/23![Southwest logo]()
$384
This Southwest deal was found by Cheapflights users on 9/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2611:35 pm -
1 stop7h 50m
Tue 11/38:25 am -
2 stops8h 35m
Deal found 9/24![Southwest logo]()
$394
This Cheapflightsfares deal was found by Cheapflights users on 9/26. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2912:31 pm -
1 stop22h 02m
Sat 11/77:59 pm -
1 stop17h 13m
Deal found 9/26![Frontier logo]()
$356
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 September 29, 2026.
Search for one-way flight options from Portland to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 29, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/35:09 pm -
1 stop15h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$149
This CheapOair deal was found by Cheapflights users on 9/27. 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.
Tue 12/15:09 pm -
1 stop15h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$156
This Cheapflightsfares deal was found by Cheapflights users on 9/28. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/271:58 pm -
1 stop24h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 9/26. 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 11/231:31 pm -
1 stop24h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Frontier logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 9/27. 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.
Tue 10/2011:49 am -
2 stops27h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$173
This Kiwi.com deal was found by Cheapflights users on 9/28. 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.
Tue 10/2712:02 pm -
2 stops27h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/28![Frontier logo]()
$175
This Cheapflightsfares deal was found by Cheapflights users on 9/26. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/248:54 pm -
1 stop12h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Frontier logo]()
$183
This Mytrip deal was found by Cheapflights users on 9/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/511:06 am -
2 stops28h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$190
This Kiwi.com deal was found by Cheapflights users on 9/24. 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 10/2211:06 am -
2 stops28h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Frontier logo]()
$191
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 September 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $286 (Cheapflightsfares) |
One-way from | $149 (Cheapflightsfares) |
Popular in | July |
Cheapest in | May |
Average price | $377 |
Good round-trip deal | $466 or less |
Good one-way deal | $356 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 7,457,451 searches. Data last updated September 29, 2026.
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
Cheapest round-trip
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Tue 10/20
3:22 pm-11:21 pm
1 stop5h 59m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$195
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Fri 10/23
11:30 pm-10:48 am
1 stop9h 18m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$195
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Fri 11/27
5:15 am-1:32 pm
1 stop6h 17m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$195
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Tue 10/27
6:00 am-2:45 pm
1 stop6h 45m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$195
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Sat 12/26
11:59 pm-10:42 am
1 stop8h 43m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$195
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Mon 12/21
6:05 am-4:36 pm
1 stop8h 31m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$195
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Wed 11/25
2:34 pm-11:24 pm
1 stop6h 50m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$195
Quickest round-trip
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Thu 11/26
11:58 am-7:31 pm
1 stop5h 33m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$195
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Fri 10/16
10:33 pm-11:33 am
1 stop11h 00m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$195
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Mon 10/26
11:00 pm-10:51 am
1 stop9h 51m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$195
Showing 1-10 of 23 resultsSorted by cheapest first
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 September.
| 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 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?
The best time to book flights from Portland to St. Louis is 72 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, May is the cheapest month in which you can book a flight from Portland to St. Louis (average of $314). Flying from Portland to St. Louis in July is currently the most expensive (average of $417). 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.
What is the cheapest time of day to fly from PDX to STL?
Find hourly flight availability from Portland to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 29, 2026.
When flying from Portland to St. Louis, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
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 September 29, 2026.
See what other customers who have flown with Southwest,Alaska Airlines, andDelta 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.
Crew
8.6
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Crew
8.6
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Crew
8.6
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Crew
8.6
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Crew
8.6
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
Crew
8.6
Boarding
8.1
Entertainment
7.5
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
10.0
ExcellentEdward,Sep 2026
MCO - BWI
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 locationsFairview Heights
O'Fallon
Fenton
Swansea
Eureka
Wentzville
Maryland Heights
Collinsville
Edwardsville
Glencoe
Chesterfield
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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 7,457,451 searches. Data last updated September 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$75 | Average$282 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$177 | Average$352 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$213 | Average$397 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$248 | Average$502 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$248 | Average$398 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$248 | Average$376 | FlexibilityNo cancel fee | On-time71% |