Cheap flights from Portland to St. Louis (PWM - STL) from $100

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 6/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
PWM — STL
Jun 3 — Jun 101

The best prices from Portland to Lambert-St Louis are usually found in January or November, booked 47 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Portland to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) 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 May 29, 2024.

Popular in

April

Cheapest in

January

Round-trip from

$319

One-way from

$180
High demand for flights, 23% potential price rise
Best time to find cheap flights, 16% potential price drop
From Portland to Lambert-St Louis
One-way flight from Portland to Lambert-St Louis

What is the cheapest day to fly round-trip from Portland, Maine to St. Louis?

Departing on a Tuesday is a good option for securing a great price. You can expect to save up to 45% when planning your travel around this day of the week.

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

To save up to 164% on this flight, we recommend booking at least 48 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Portland, Maine to St. Louis from $639 1-2 weeks out and tickets from $639 for flights departing within the next 72 hours.

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

Due to multiple factors, expect to potentially pay more when booking in April. For low rates, January can be a great choice for travel to St. Louis. Flights to St. Louis from Portland, Maine in January are about $520 on average during January, but can be found for as low as $254.

When is the cheapest time to fly from Portland, Maine to St. Louis (PWM - STL)?

When flying from Portland, Maine to St. Louis, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 17% versus a flight in the afternoon.

Cheap American Airlines flights from Portland to St. Louis

Explore cheap flight options specifically provided by American Airlines for the route between Portland and St. Louis. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,765,679 searches. Data last updated May 29, 2024.
Check out some of the cheapest American Airlines flights we've come across from Portland to St. Louis. Come back soon if you're not finding the exact deal you're looking for.
Mon 9/305:34 pmPWM - STL
1 stop5h 35mAmerican Airlines
Wed 10/23:34 pmSTL - PWM
1 stop6h 19mAmerican Airlines
Deal found 5/29$295
Fri 10/47:29 amPWM - STL
1 stop5h 29mAmerican Airlines
Mon 10/76:28 pmSTL - PWM
1 stop4h 10mAmerican Airlines
Deal found 5/28$305
Sat 7/275:59 amPWM - STL
1 stop7h 43mAmerican Airlines
Sat 8/33:18 pmSTL - PWM
1 stop7h 28mAmerican Airlines
Deal found 5/27$365
Mon 6/1011:35 amPWM - STL
1 stop9h 38mAmerican Airlines
Wed 6/125:38 pmSTL - PWM
1 stop6h 14mAmerican Airlines
Deal found 5/28$537
Sat 7/275:05 pmPWM - STL
2 stops20h 22mAmerican Airlines
Sat 8/39:24 amSTL - PWM
2 stops12h 22mAmerican Airlines
Deal found 5/27$718

Cheap United Airlines flights from Portland to St. Louis

Explore cheap flight options specifically provided by United Airlines for the route between Portland and St. Louis. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,765,679 searches. Data last updated May 29, 2024.
Some of the best deals we've found on United Airlines flights traveling from Portland to St. Louis. Check back soon if you're not seeing flights that suit your needs.
Fri 10/46:00 amPWM - STL
1 stop5h 07mUnited Airlines
Mon 10/711:09 amSTL - PWM
2 stops11h 50mUnited Airlines
Deal found 5/28$457
Mon 9/304:50 pmPWM - STL
1 stop7h 12mUnited Airlines
Wed 10/211:09 amSTL - PWM
2 stops11h 50mUnited Airlines
Deal found 5/29$512
Fri 10/47:27 pmPWM - STL
2 stops21h 32mUnited Airlines
Mon 10/711:09 amSTL - PWM
2 stops11h 50mUnited Airlines
Deal found 5/28$516
Mon 9/304:50 pmPWM - STL
2 stops18h 17mUnited Airlines
Wed 10/211:09 amSTL - PWM
2 stops11h 50mUnited Airlines
Deal found 5/29$571
Sat 7/273:50 pmPWM - STL
1 stop7h 55mUnited Airlines
Sat 8/36:30 amSTL - PWM
2 stops12h 15mUnited Airlines
Deal found 5/27$573

Cheap Portland to St. Louis flights in May & June 2024

Find cheap flight options from Portland to St. Louis specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,765,679 searches. Prices were last updated on May 29, 2024.
Check out some of the best flight deals from Portland to St. Louis in 2024. More deals are always being added, so be sure to check back regularly.
Mon 6/1010:50 amPWM - STL
1 stop25h 07mMultiple Airlines
Wed 6/121:55 pmSTL - PWM
2 stops21h 46mMultiple Airlines
Deal found 5/28$383
Mon 6/107:39 pmPWM - STL
2 stops19h 44mMultiple Airlines
Wed 6/121:55 pmSTL - PWM
2 stops21h 46mMultiple Airlines
Deal found 5/28$408
Mon 6/107:39 pmPWM - STL
2 stops19h 44mMultiple Airlines
Wed 6/1212:15 pmSTL - PWM
3 stops23h 26mMultiple Airlines
Deal found 5/28$413
Mon 6/102:06 pmPWM - STL
3 stops21h 51mMultiple Airlines
Wed 6/1212:15 pmSTL - PWM
3 stops23h 26mMultiple Airlines
Deal found 5/28$452
Mon 6/1011:35 amPWM - STL
1 stop9h 38mAmerican Airlines
Wed 6/125:38 pmSTL - PWM
1 stop6h 14mAmerican Airlines
Deal found 5/28$537
Wed 5/2912:21 pmPWM - STL
1 stop8h 09mAmerican Airlines
Sun 6/24:20 pmSTL - PWM
1 stop5h 24mAmerican Airlines
Deal found 5/28$661
Wed 5/292:32 pmPWM - STL
1 stop7h 28mAmerican Airlines
Sun 6/24:20 pmSTL - PWM
1 stop5h 24mAmerican Airlines
Deal found 5/28$663
Thu 5/303:45 pmPWM - STL
2 stops24h 29mMultiple Airlines
Sun 6/26:19 pmSTL - PWM
2 stops14h 50mMultiple Airlines
Deal found 5/28$700
Thu 5/303:45 pmPWM - STL
2 stops24h 29mMultiple Airlines
Sun 6/27:30 pmSTL - PWM
1 stop13h 39mMultiple Airlines
Deal found 5/28$750

Portland to St. Louis 2024 flight deals

Discover exclusive flight deals for travel between Portland and St. Louis in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,765,679 searches. Data last updated May 29, 2024.
Check out some of the best flight deals from Portland to St. Louis in 2024. More deals are always being added, so be sure to check back regularly.
Fri 10/47:29 amPWM - STL
1 stop5h 29mAmerican Airlines
Mon 10/76:28 pmSTL - PWM
1 stop4h 10mAmerican Airlines
Deal found 5/28$305
Sat 7/275:59 amPWM - STL
1 stop7h 43mAmerican Airlines
Sat 8/33:18 pmSTL - PWM
1 stop7h 28mAmerican Airlines
Deal found 5/27$365
Mon 6/1010:50 amPWM - STL
1 stop25h 07mMultiple Airlines
Wed 6/121:55 pmSTL - PWM
2 stops21h 46mMultiple Airlines
Deal found 5/28$383
Mon 6/107:39 pmPWM - STL
2 stops19h 44mMultiple Airlines
Wed 6/121:55 pmSTL - PWM
2 stops21h 46mMultiple Airlines
Deal found 5/28$408
Mon 6/107:39 pmPWM - STL
2 stops19h 44mMultiple Airlines
Wed 6/1212:15 pmSTL - PWM
3 stops23h 26mMultiple Airlines
Deal found 5/28$413
Mon 6/102:06 pmPWM - STL
3 stops21h 51mMultiple Airlines
Wed 6/1212:15 pmSTL - PWM
3 stops23h 26mMultiple Airlines
Deal found 5/28$452
Fri 10/46:00 amPWM - STL
1 stop5h 07mUnited Airlines
Mon 10/711:09 amSTL - PWM
2 stops11h 50mUnited Airlines
Deal found 5/28$457
Fri 10/47:27 pmPWM - STL
2 stops21h 32mUnited Airlines
Mon 10/711:09 amSTL - PWM
2 stops11h 50mUnited Airlines
Deal found 5/28$516
Mon 6/1011:35 amPWM - STL
1 stop9h 38mAmerican Airlines
Wed 6/125:38 pmSTL - PWM
1 stop6h 14mAmerican Airlines
Deal found 5/28$537

One-way flights to St. Louis from Portland

Search for one-way flight options from Portland to St. Louis. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,765,679 searches. Data last updated May 29, 2024.
Take a look at some of the best available options we've come across on one-way flights from Portland to St. Louis. Those seeking round-trip flights from Portland to St. Louis should utilize the search form at the the top of the page.
Thu 6/61:57 pmPWM - STL
1 stop18h 10mFrontier
Deal found 5/28$100
Sun 7/77:37 pmPWM - STL
1 stop14h 06mFrontier
Deal found 5/28$180
Sat 6/151:05 pmPWM - STL
1 stop7h 24mAmerican Airlines
Deal found 5/28$212
Sat 8/33:50 pmPWM - STL
1 stop7h 55mUnited Airlines
Deal found 5/28$224
Sat 6/151:30 pmPWM - STL
3 stops28h 02mMultiple Airlines
Deal found 5/28$228
Thu 6/61:33 pmPWM - STL
2 stops25h 43mMultiple Airlines
Deal found 5/28$240
Sat 8/35:30 amPWM - STL
2 stops18h 15mUnited Airlines
Deal found 5/28$320
Thu 6/61:33 pmPWM - STL
3 stops25h 43mMultiple Airlines
Deal found 5/28$354
Sun 7/71:27 pmPWM - STL
2 stops25h 24mMultiple Airlines
Deal found 5/29$368

Find flights from Portland to St. Louis within your budget

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 2,765,679 searches. Data last updated May 29, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$295 - $512

Route

Depart

Return

Price

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Mon 9/30

1 stop5h 35m

Lambert-St Louis

Wed 10/2

1 stop6h 19m

$295

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Fri 10/4

1 stop5h 29m

Lambert-St Louis

Mon 10/7

1 stop4h 10m

$305

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Sat 7/27

1 stop7h 43m

Lambert-St Louis

Sat 8/3

1 stop7h 28m

$365

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Mon 6/10

1 stop25h 07m

Lambert-St Louis

Wed 6/12

2 stops21h 46m

$383

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Mon 6/10

2 stops19h 44m

Lambert-St Louis

Wed 6/12

2 stops21h 46m

$408

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Mon 6/10

2 stops19h 44m

Lambert-St Louis

Wed 6/12

3 stops23h 26m

$413

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Mon 6/10

3 stops21h 51m

Lambert-St Louis

Wed 6/12

3 stops23h 26m

$452

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Fri 10/4

1 stop5h 07m

Lambert-St Louis

Mon 10/7

2 stops11h 50m

$457

PortlandLambert-St Louis

PWM - STL

PWMSTL

Portland

Mon 9/30

1 stop7h 12m

Lambert-St Louis

Wed 10/2

2 stops11h 50m

$512

Flights are sorted by cheapest first

Deals found on 5/29

How far ahead should I book a flight from Portland, Maine 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 May 24, 2024.
The price you pay for your flight from Portland, Maine to St. Louis may vary depending on when you book. For the best chance of a lower fare, look to book 47 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Search Deals

When is the cheapest time to fly from Portland, Maine to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from Portland to St. Louis. Price data was last updated on May 26, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Portland, Maine to St. Louis flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

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.
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.

Temperature and rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature and rainfall totals by month.

STL

Temperature

32 - 80.6 °F

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 May 29, 2024.
Peruse reviews from past customers who have flown with American Airlines and United Airlines from Portland to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
7.4
Good
10,784 reviews

Comfort

7.2

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.7

Entertainment

7.1

Reviews

1 / 10

Flight from shv was great. My connecting flight was canceled though. Had to stay overnight in airport

7.4
Good
10,784 reviews
7.4
Good
10,784 reviews

Comfort

7.2

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.7

Entertainment

7.1

Reviews

1 / 10

Flight from shv was great. My connecting flight was canceled though. Had to stay overnight in airport

7.3
Good
14,302 reviews
7.4
Good
10,784 reviews

Comfort

7.2

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.7

Entertainment

7.1

Reviews

1 / 10

Flight from shv was great. My connecting flight was canceled though. Had to stay overnight in airport

6.3
Okay
4,016 reviews
7.4
Good
10,784 reviews

Comfort

7.2

Boarding

7.7

Crew

8.1

Overall

7.4

Food

6.7

Entertainment

7.1

Reviews

1 / 10

Flight from shv was great. My connecting flight was canceled though. Had to stay overnight in airport

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.
  • Can I find flights from Portland, Maine to St. Louis for under $300 on Cheapflights?

    Yes, there are multiple flights from Portland, Maine to St. Louis for under $300. The cheapest flight booked recently is on American Airlines for just $295, but on average you can expect to pay $488.

  • What are the cheapest airlines flying from Portland, Maine to St. Louis round-trip?

    Flying on American Airlines is currently your cheapest option to St. Louis, with prices starting at $295. Another option worth looking into is United Airlines, starting at $457 round trip. American Airlines is 43% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Portland, Maine to St. Louis one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $100. Users have also found prices from $212 and $224 on American Airlines and United Airlines, respectively.

  • What does PWM to STL mean?

    PWM stands for Portland Airport, while STL stands for Lambert-St Louis Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry.

  • Can I find deals for flights from Portland to St. Louis that include extra baggage allowance?

    The amount of baggage you can bring on your Portland to St. Louis flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Portland to St. Louis with specific airlines?

    Yes, Cheapflights allows you to browse and filter Portland to St. Louis flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Portland to St. Louis that include hotel bookings?

    Yes. In addition to deals on Portland to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Portland to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to St. Louis.

  • Can I find deals for business class flights from Portland to St. Louis?

    Yes. Cheapflights offers flight deals from Portland to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Portland to St. Louis that allow pets onboard?

    Many airlines flying from Portland to St. Louis offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Portland to St. Louis?

    Yes, you can often find last-minute deals on Portland to St. Louis flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Portland, Maine to St. Louis flight deals updated?

    The Portland, Maine to St. Louis flight deals you see on this page were last updated on 5/28.

  • What are the most popular airlines that fly from Portland, Maine to St. Louis?

  • What is the cheapest month to book a flight from Portland, Maine to St. Louis?

    Currently, September is the cheapest month in which you can book a flight from Portland, Maine to St. Louis (average of $319). Flying from Portland, Maine to St. Louis in July is currently the most expensive (average of $366). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 4 airlines flying from Portland to St. Louis

Discover the top 4 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 2,765,679 searches. Data last updated May 29, 2024.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$339Average$540FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapest$346Average$470FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$361Average$494FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
JetBlueCheapest$412Average$484FlexibilityNo cancel feeOn-time62%
Search JetBlue flights

Search flights from Portland to St. Louis by cabin class

Find flights from Portland to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Portland to St. Louis?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Portland to St. Louis. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Portland to St. Louis?

Cheapflights helps you find that perfect flight to St. Louis from Portland by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Portland to St. Louis with no change fees?

Certainly. Search results for flights to St. Louis from Portland shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Portland to St. Louis become cheaper?

Yes, Cheapflights offers price alerts on Portland to St. Louis flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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