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Cheap flights from Rome Fiumicino Airport to St. Louis from $426

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Rome Fiumicino Airport to St. Louis departing on 9/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Rome Fiumicino Airport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
9:55 am - 7:29 pm
FCO
-
STL
16h 34m
2 stops
United Airlines Logo
6:00 am - 7:45 am
STL
-
FCO
18h 45m
1 stop
$939United Airlines
Thu, Nov 5 - Sun, Nov 8
United Airlines Logo
9:55 am - 7:29 pm
FCO
-
STL
16h 34m
2 stops
United Airlines Logo
6:00 am - 7:45 am
STL
-
FCO
18h 45m
1 stop
$940United Airlines
Thu, Nov 5 - Sun, Nov 8
United Airlines Logo
9:55 am - 9:51 pm
FCO
-
STL
18h 56m
2 stops
United Airlines Logo
8:33 am - 7:45 am
STL
-
FCO
16h 12m
1 stop
$941United Airlines
Thu, Nov 5 - Sun, Nov 8
United Airlines Logo
9:55 am - 7:29 pm
FCO
-
STL
16h 34m
2 stops
United Airlines Logo
8:33 am - 8:55 am
STL
-
FCO
17h 22m
2 stops
$942United Airlines
Thu, Nov 5 - Sun, Nov 8
United Airlines Logo
9:55 am - 7:29 pm
FCO
-
STL
16h 34m
2 stops
United Airlines Logo
8:33 am - 8:55 am
STL
-
FCO
17h 22m
2 stops
$943United Airlines
Thu, Nov 5 - Sun, Nov 8
United Airlines Logo
7:05 am - 9:13 pm
FCO
-
STL
21h 08m
2 stops
United Airlines Logo
8:33 am - 8:55 am
STL
-
FCO
17h 22m
2 stops
$945United Airlines
Thu, Nov 5 - Sun, Nov 8
Lufthansa Logo
7:05 am - 4:56 pm
FCO
-
STL
16h 51m
2 stops
Lufthansa Logo
7:04 pm - 6:15 pm
STL
-
FCO
16h 11m
2 stops
$946Lufthansa
Sat, Nov 14 - Sun, Nov 15
Lufthansa Logo
7:05 am - 4:56 pm
FCO
-
STL
16h 51m
2 stops
Lufthansa Logo
12:05 pm - 7:55 am
STL
-
FCO
12h 50m
1 stop
$948Lufthansa
Sat, Nov 14 - Sun, Nov 15
United Airlines Logo
9:45 am - 4:56 pm
FCO
-
STL
14h 11m
1 stop
United Airlines Logo
9:40 am - 7:45 am
STL
-
FCO
15h 05m
1 stop
$955United Airlines
Thu, Nov 5 - Sun, Nov 8
United Airlines Logo
9:45 am - 4:56 pm
FCO
-
STL
14h 11m
1 stop
United Airlines Logo
9:40 am - 7:45 am
STL
-
FCO
15h 05m
1 stop
$956United Airlines
Thu, Nov 5 - Sun, Nov 8

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British Airways flights from Rome Fiumicino Airport to St. Louis

Our best British Airways deals on Rome Fiumicino Airport to St. Louis flight tickets
British Airways
Aug 11
FCO1:30 pmRome Fiumicino
16h 25m
1 stop
STL10:55 pmLambert-St Louis
Jun 11
STL9:35 pmLambert-St Louis
14h 45m
1 stop
FCO7:20 pmRome Fiumicino
$1,029
British Airways
Aug 4
FCO1:30 pmRome Fiumicino
33h 55m
1 stop
STL4:25 pmLambert-St Louis
Sep 30
STL7:21 amLambert-St Louis
18h 49m
1 stop
FCO9:10 amRome Fiumicino
$1,034
British Airways
Aug 4
FCO1:30 pmRome Fiumicino
33h 55m
1 stop
STL4:25 pmLambert-St Louis
Sep 30
STL7:21 amLambert-St Louis
18h 49m
1 stop
FCO9:10 amRome Fiumicino
$1,035

Delta flights from Rome Fiumicino Airport to St. Louis

Our best Delta deals on Rome Fiumicino Airport to St. Louis flight tickets
Delta
Aug 11
FCO6:30 amRome Fiumicino
21h 12m
2 stops
STL8:42 pmLambert-St Louis
Mar 23
STL2:18 pmLambert-St Louis
15h 12m
2 stops
FCO11:30 amRome Fiumicino
$1,030
Delta
Aug 12
FCO10:35 amRome Fiumicino
19h 51m
2 stops
STL11:26 pmLambert-St Louis
Mar 21
STL4:13 pmLambert-St Louis
16h 47m
2 stops
FCO3:00 pmRome Fiumicino
$1,031
Delta
Aug 12
FCO10:35 amRome Fiumicino
19h 51m
2 stops
STL11:26 pmLambert-St Louis
Mar 21
STL4:13 pmLambert-St Louis
12h 47m
1 stop
FCO11:00 amRome Fiumicino
$1,035

momondo Fare Finder

 
Customize your flight search to find flights from Rome Fiumicino Airport 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 July 22, 2026.
Use the filters below to find and compare flights from Rome Fiumicino Airport to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 11/5

9:55 am-7:29 pm

2 stops16h 34m

Lambert-St Louis

Sun 11/8

6:00 am-7:45 am

1 stop18h 45m

$939

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 11/5

9:55 am-7:29 pm

2 stops16h 34m

Lambert-St Louis

Sun 11/8

6:00 am-7:45 am

1 stop18h 45m

$940

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 11/5

9:55 am-9:51 pm

2 stops18h 56m

Lambert-St Louis

Sun 11/8

8:33 am-7:45 am

1 stop16h 12m

$941

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 11/5

9:55 am-7:29 pm

2 stops16h 34m

Lambert-St Louis

Sun 11/8

8:33 am-8:55 am

2 stops17h 22m

$942

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 11/5

9:55 am-7:29 pm

2 stops16h 34m

Lambert-St Louis

Sun 11/8

8:33 am-8:55 am

2 stops17h 22m

$943

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 11/5

7:05 am-9:13 pm

2 stops21h 08m

Lambert-St Louis

Sun 11/8

8:33 am-8:55 am

2 stops17h 22m

$945

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Sat 11/14

7:05 am-4:56 pm

2 stops16h 51m

Lambert-St Louis

Sun 11/15

7:04 pm-6:15 pm

2 stops16h 11m

$946

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Sat 11/14

7:05 am-4:56 pm

2 stops16h 51m

Lambert-St Louis

Sun 11/15

12:05 pm-7:55 am

1 stop12h 50m

$948
Quickest round-trip

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 11/5

9:45 am-4:56 pm

1 stop14h 11m

Lambert-St Louis

Sun 11/8

9:40 am-7:45 am

1 stop15h 05m

$955

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 11/5

9:45 am-4:56 pm

1 stop14h 11m

Lambert-St Louis

Sun 11/8

9:40 am-7:45 am

1 stop15h 05m

$956

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Rome Fiumicino Airport 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 Rome Fiumicino Airport and St. Louis?

What is the cheapest month to fly to St. Louis?

In general, May is the cheapest month to fly from Rome Fiumicino Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $0. The month of March is another great option to travel to St. Louis, with average flight prices from Rome Fiumicino Airport averaging around $0.

Can stopping save me money on Rome Fiumicino Airport to St. Louis flights?

You could potentially save up to 6% on your flight if you consider stops on a Rome Fiumicino Airport to St. Louis flight.

When to book flights from Rome Fiumicino Airport to St. Louis

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

Cheap Rome Fiumicino Airport to St. Louis (FCO to STL) flight deals and tips

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

Fastest flight time

14h 42m

Direct flights

None
The fastest flight from Rome Fiumicino Airport to St. Louis takes 14h 42m
There are no direct flights from Rome Fiumicino Airport to St. Louis. There are no popular flight routes from Rome Fiumicino Airport to St. Louis.
Search flight deals

Frequently asked questions about flying from Rome Fiumicino Airport to St. Louis

  • How far is Rome Fiumicino to Lambert-St Louis by plane?

    The straight-line distance from Rome Fiumicino to Lambert-St Louis is 5048.2 mi. Flights usually cover this in 14h 42m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Rome Fiumicino Airport to Lambert-St Louis Airport?

    Prices for flights from Rome Fiumicino Airport to Lambert-St Louis Airport are updated daily.

  • How old do you have to be to fly from Rome Fiumicino Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Rome Fiumicino Airport to Lambert-St Louis Airport.

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

    The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Traveling to a place near St. Louis?

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

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to St. Louis from Rome.

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

Yes. momondo enables you to select and highlight flights to St. Louis from Rome with this policy.

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

momondo provides multiple filters to help you find the best flight to St. Louis from Rome. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Of course. momondo tracks the price of Rome to St. Louis flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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