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Cheap flights from Missoula to St. Louis from $353

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Missoula to St. Louis departing on 1/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Alaska Airlines Logo
6:23 am - 1:54 pm
MSO
-
STL
6h 31m1 stop
Alaska Airlines Logo
6:19 pm - 1:23 pm
STL
-
MSO
20h 04m2 stops
$353Alaska Airlines
Wed, Jan 21 - Sat, Jan 24
Delta Logo
1:25 pm - 9:38 pm
MSO
-
STL
7h 13m1 stop
Delta Logo
6:40 am - 12:30 pm
STL
-
MSO
6h 50m1 stop
$371Delta
Thu, Jan 22 - Sun, Jan 25
Delta Logo
1:25 pm - 11:25 pm
MSO
-
STL
9h 00m2 stops
Delta Logo
6:40 am - 12:30 pm
STL
-
MSO
6h 50m1 stop
$376Delta
Thu, Jan 22 - Sun, Jan 25
Alaska Airlines Logo
6:23 am - 1:54 pm
MSO
-
STL
6h 31m1 stop
Alaska Airlines Logo
6:19 pm - 1:23 pm
STL
-
MSO
20h 04m2 stops
$383Alaska Airlines
Wed, Jan 21 - Sat, Jan 24
Alaska Airlines Logo
6:23 am - 1:54 pm
MSO
-
STL
6h 31m1 stop
Alaska Airlines Logo
6:19 pm - 12:23 pm
STL
-
MSO
19h 04m1 stop
$387Alaska Airlines
Wed, Jan 21 - Sat, Jan 24
Alaska Airlines Logo
6:23 am - 1:54 pm
MSO
-
STL
6h 31m1 stop
Alaska Airlines Logo
6:19 pm - 12:23 pm
STL
-
MSO
19h 04m1 stop
$397Alaska Airlines
Wed, Jan 21 - Sat, Jan 24
Alaska Airlines Logo
1:03 pm - 1:54 pm
MSO
-
STL
23h 51m2 stops
Alaska Airlines Logo
6:19 pm - 1:23 pm
STL
-
MSO
20h 04m2 stops
$424Alaska Airlines
Wed, Jan 21 - Sat, Jan 24
Delta Logo
7:55 am - 8:43 pm
MSO
-
STL
11h 48m2 stops
Delta Logo
9:59 am - 8:14 pm
STL
-
MSO
11h 15m2 stops
$435Delta
Thu, Jan 22 - Sun, Jan 25
United Airlines Logo
6:00 am - 7:27 pm
MSO
-
STL
12h 27m2 stops
United Airlines Logo
9:57 am - 9:51 pm
STL
-
MSO
12h 54m2 stops
$443United Airlines
Wed, Jan 21 - Sat, Jan 24
United Airlines Logo
6:00 am - 4:03 pm
MSO
-
STL
9h 03m2 stops
United Airlines Logo
6:30 am - 4:02 pm
STL
-
MSO
10h 32m2 stops
$461United Airlines
Thu, Jan 22 - Sun, Jan 25

United Airlines flights from Missoula to St. Louis

Our best United Airlines deals on Missoula to St. Louis flight tickets
United Airlines
Jan 21
MSO6:00 amMissoula Johnson-Bell Field
12h 27m
2 stops
STL7:27 pmLambert-St Louis
Jan 24
STL9:57 amLambert-St Louis
12h 54m
2 stops
MSO9:51 pmMissoula Johnson-Bell Field
$443
Find similar
United Airlines
Jan 22
MSO6:00 amMissoula Johnson-Bell Field
9h 03m
2 stops
STL4:03 pmLambert-St Louis
Jan 25
STL6:30 amLambert-St Louis
10h 32m
2 stops
MSO4:02 pmMissoula Johnson-Bell Field
$461
Find similar
United Airlines
Dec 28
MSO2:38 pmMissoula Johnson-Bell Field
6h 44m
1 stop
STL10:22 pmLambert-St Louis
Jan 3
STL8:15 amLambert-St Louis
14h 26m
2 stops
MSO9:41 pmMissoula Johnson-Bell Field
$651
Find similar

Alaska Airlines flights from Missoula to St. Louis

Our best Alaska Airlines deals on Missoula to St. Louis flight tickets
Alaska Airlines
Jan 21
MSO6:23 amMissoula Johnson-Bell Field
6h 31m
1 stop
STL1:54 pmLambert-St Louis
Jan 24
STL6:19 pmLambert-St Louis
20h 04m
2 stops
MSO1:23 pmMissoula Johnson-Bell Field
$353
Find similar
Alaska Airlines
Jan 21
MSO6:23 amMissoula Johnson-Bell Field
6h 31m
1 stop
STL1:54 pmLambert-St Louis
Jan 24
STL6:19 pmLambert-St Louis
20h 04m
2 stops
MSO1:23 pmMissoula Johnson-Bell Field
$383
Find similar
Alaska Airlines
Jan 21
MSO6:23 amMissoula Johnson-Bell Field
6h 31m
1 stop
STL1:54 pmLambert-St Louis
Jan 24
STL6:19 pmLambert-St Louis
19h 04m
1 stop
MSO12:23 pmMissoula Johnson-Bell Field
$387
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Missoula to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 16, 2025.
Use the filters below to find and compare flights from Missoula to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Wed 1/21

6:23 am-1:54 pm

1 stop6h 31m

Lambert-St Louis

Sat 1/24

6:19 pm-1:23 pm

2 stops20h 04m

$353

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Thu 1/22

1:25 pm-9:38 pm

1 stop7h 13m

Lambert-St Louis

Sun 1/25

6:40 am-12:30 pm

1 stop6h 50m

$371

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Thu 1/22

1:25 pm-11:25 pm

2 stops9h 00m

Lambert-St Louis

Sun 1/25

6:40 am-12:30 pm

1 stop6h 50m

$376

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Wed 1/21

6:23 am-1:54 pm

1 stop6h 31m

Lambert-St Louis

Sat 1/24

6:19 pm-1:23 pm

2 stops20h 04m

$383

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Wed 1/21

6:23 am-1:54 pm

1 stop6h 31m

Lambert-St Louis

Sat 1/24

6:19 pm-12:23 pm

1 stop19h 04m

$387

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Wed 1/21

6:23 am-1:54 pm

1 stop6h 31m

Lambert-St Louis

Sat 1/24

6:19 pm-12:23 pm

1 stop19h 04m

$397

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Wed 1/21

1:03 pm-1:54 pm

2 stops23h 51m

Lambert-St Louis

Sat 1/24

6:19 pm-1:23 pm

2 stops20h 04m

$424

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Thu 1/22

7:55 am-8:43 pm

2 stops11h 48m

Lambert-St Louis

Sun 1/25

9:59 am-8:14 pm

2 stops11h 15m

$435

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Wed 1/21

6:00 am-7:27 pm

2 stops12h 27m

Lambert-St Louis

Sat 1/24

9:57 am-9:51 pm

2 stops12h 54m

$443

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Thu 1/22

6:00 am-4:03 pm

2 stops9h 03m

Lambert-St Louis

Sun 1/25

6:30 am-4:02 pm

2 stops10h 32m

$461

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to St. Louis from

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

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

What is the typical price of a round-trip flight between Missoula and St. Louis?

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

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $348. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $557. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

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

Flying to St. Louis from Missoula at noon is the least expensive time of day to depart. momondo users have found prices as low as $512 when looking at flights departing at noon. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $542 per ticket.

When to book flights from Missoula to St. Louis

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

Cheap Missoula to St. Louis (MSO to STL) flight deals and tips

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

Fastest flight time

5h 21m

Direct flights

None
The fastest flight from Missoula to St. Louis takes 5h 21m
There are no direct flights from Missoula to St. Louis. There are no popular flight routes from Missoula to St. Louis.
Search flight deals

  • How far is Missoula Johnson-Bell Field to Lambert-St Louis by plane?

    The straight-line distance from Missoula Johnson-Bell Field to Lambert-St Louis is 1327.0 mi. A reasonable flight in good conditions will take 5h 21m.

  • When did momondo last update prices for flights from Missoula Johnson-Bell Field Airport to Lambert-St Louis Airport?

    Prices for flights from Missoula Johnson-Bell Field Airport to Lambert-St Louis Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Missoula Johnson-Bell Field Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Missoula Johnson-Bell Field Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Missoula Johnson-Bell Field Airport to Lambert-St Louis Airport.

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

    The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

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

Best airlines flying from Missoula to St. Louis

Compare and see reviews for airlines that fly from Missoula to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $260Free CancellationRating
7.9
8,010 reviews
Search Delta flights
United AirlinesPriceFrom $274Free CancellationRating
7.4
9,094 reviews
Search United Airlines flights

Traveling to a place near St. Louis?

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

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Missoula to St. Louis. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. All flights to St. Louis from Missoula on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once all potential Missoula to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Price alerts on flights to St. Louis from Missoula are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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