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Cheap flights from Rome Fiumicino Airport to St. Louis from $443

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 6/9. 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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Find the cheapest flights from Rome Fiumicino Airport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
11:30 am - 8:25 pm
FCO
-
STL
15h 55m
1 stop
Air Canada Logo
1:05 pm - 9:15 am
STL
-
FCO
13h 10m
1 stop
$938Air Canada
Fri, May 29 - Tue, Jun 2
Air Canada Logo
11:30 am - 8:09 pm
FCO
-
STL
15h 39m
2 stops
Air Canada Logo
1:05 pm - 9:15 am
STL
-
FCO
13h 10m
1 stop
$940Air Canada
Fri, May 29 - Tue, Jun 2
Air Canada Logo
11:30 am - 8:25 pm
FCO
-
STL
15h 55m
1 stop
Air Canada Logo
1:05 pm - 8:50 am
STL
-
FCO
36h 45m
2 stops
$951Air Canada
Wed, May 27 - Sun, May 31
United Airlines Logo
6:50 am - 1:25 pm
FCO
-
STL
13h 35m
1 stop
United Airlines Logo
6:00 am - 7:35 am
STL
-
FCO
18h 35m
1 stop
$955United Airlines
Wed, May 27 - Sun, May 31
United Airlines Logo
9:45 am - 6:09 pm
FCO
-
STL
15h 24m
2 stops
United Airlines Logo
10:23 am - 7:45 am
STL
-
FCO
14h 22m
1 stop
$957United Airlines
Wed, Nov 11 - Wed, Nov 25
United Airlines Logo
7:10 am - 10:27 am
FCO
-
STL
34h 17m
2 stops
United Airlines Logo
1:05 pm - 9:15 am
STL
-
FCO
13h 10m
1 stop
$960United Airlines
Thu, Jun 11 - Wed, Jun 17
Multiple Airlines Logo
10:00 am - 8:09 pm
FCO
-
STL
17h 09m
2 stops
Multiple Airlines Logo
12:10 pm - 11:45 am
STL
-
FCO
16h 35m
1 stop
$961Multiple Airlines
Thu, Jun 11 - Sun, Aug 30
British Airways Logo
10:00 am - 12:16 am
FCO
-
STL
21h 16m
1 stop
British Airways Logo
9:40 pm - 10:40 pm
STL
-
FCO
18h 00m
1 stop
$963British Airways
Thu, Jun 11 - Sun, Aug 30
Multiple Airlines Logo
6:50 am - 1:25 pm
FCO
-
STL
13h 35m
1 stop
Multiple Airlines Logo
7:05 am - 8:50 am
STL
-
FCO
18h 45m
2 stops
$968Multiple Airlines
Wed, May 27 - Sun, May 31
Multiple Airlines Logo
10:00 am - 8:09 pm
FCO
-
STL
17h 09m
2 stops
Multiple Airlines Logo
8:55 am - 9:15 am
STL
-
FCO
17h 20m
2 stops
$970Multiple Airlines
Thu, Jun 11 - Sun, Aug 30

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
Jun 11
FCO10:00 amRome Fiumicino
21h 16m
1 stop
STL12:16 amLambert-St Louis
Aug 30
STL9:40 pmLambert-St Louis
18h 00m
1 stop
FCO10:40 pmRome Fiumicino
$963
British Airways
Aug 5
FCO12:15 pmRome Fiumicino
18h 08m
1 stop
STL11:23 pmLambert-St Louis
Sep 29
STL9:35 pmLambert-St Louis
18h 00m
1 stop
FCO10:35 pmRome Fiumicino
$1,055
British Airways
Aug 5
FCO12:15 pmRome Fiumicino
18h 08m
1 stop
STL11:23 pmLambert-St Louis
Sep 29
STL9:35 pmLambert-St Louis
11h 50m
1 stop
FCO4:25 pmRome Fiumicino
$1,056

United Airlines flights from Rome Fiumicino Airport to St. Louis

Our best United Airlines deals on Rome Fiumicino Airport to St. Louis flight tickets
United Airlines
May 27
FCO6:50 amRome Fiumicino
13h 35m
1 stop
STL1:25 pmLambert-St Louis
May 31
STL6:00 amLambert-St Louis
18h 35m
1 stop
FCO7:35 amRome Fiumicino
$955
United Airlines
Nov 11
FCO9:45 amRome Fiumicino
15h 24m
2 stops
STL6:09 pmLambert-St Louis
Nov 25
STL10:23 amLambert-St Louis
14h 22m
1 stop
FCO7:45 amRome Fiumicino
$957
United Airlines
Jun 11
FCO7:10 amRome Fiumicino
34h 17m
2 stops
STL10:27 amLambert-St Louis
Jun 17
STL1:05 pmLambert-St Louis
13h 10m
1 stop
FCO9:15 amRome Fiumicino
$960

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 May 15, 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

Fri 5/29

11:30 am-8:25 pm

1 stop15h 55m

Lambert-St Louis

Tue 6/2

1:05 pm-9:15 am

1 stop13h 10m

$938
Quickest round-trip

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Fri 5/29

11:30 am-8:09 pm

2 stops15h 39m

Lambert-St Louis

Tue 6/2

1:05 pm-9:15 am

1 stop13h 10m

$940

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Wed 5/27

11:30 am-8:25 pm

1 stop15h 55m

Lambert-St Louis

Sun 5/31

1:05 pm-8:50 am

2 stops36h 45m

$951

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Wed 5/27

6:50 am-1:25 pm

1 stop13h 35m

Lambert-St Louis

Sun 5/31

6:00 am-7:35 am

1 stop18h 35m

$955

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Wed 11/11

9:45 am-6:09 pm

2 stops15h 24m

Lambert-St Louis

Wed 11/25

10:23 am-7:45 am

1 stop14h 22m

$957

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 6/11

7:10 am-10:27 am

2 stops34h 17m

Lambert-St Louis

Wed 6/17

1:05 pm-9:15 am

1 stop13h 10m

$960

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 6/11

10:00 am-8:09 pm

2 stops17h 09m

Lambert-St Louis

Sun 8/30

12:10 pm-11:45 am

1 stop16h 35m

$961

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 6/11

10:00 am-12:16 am

1 stop21h 16m

Lambert-St Louis

Sun 8/30

9:40 pm-10:40 pm

1 stop18h 00m

$963

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Wed 5/27

6:50 am-1:25 pm

1 stop13h 35m

Lambert-St Louis

Sun 5/31

7:05 am-8:50 am

2 stops18h 45m

$968

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 6/11

10:00 am-8:09 pm

2 stops17h 09m

Lambert-St Louis

Sun 8/30

8:55 am-9:15 am

2 stops17h 20m

$970

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 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 23% 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

13h 50m

Direct flights

None
The fastest flight from Rome Fiumicino Airport to St. Louis takes 13h 50m
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 13h 50m, 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
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
St. Peters
Collinsville
Alton
Wentzville
Fenton
Farmington
Festus
Clayton
Eureka
Litchfield
Edwardsville
Shrewsbury
Grafton

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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