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Cheap flights from Rome Fiumicino Airport to St. Louis from $454

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 1/10. 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

United Airlines Logo
1:30 pm - 10:51 amFCO-STL
28h 21m2 stops
United Airlines Logo
11:49 am - 7:55 amSTL-FCO
13h 06m1 stop
$709United Airlines
Find Deal
Thu, Nov 27 - Mon, Dec 1
United Airlines Logo
9:40 am - 9:00 pmFCO-STL
18h 20m2 stops
United Airlines Logo
6:00 pm - 9:25 amSTL-FCO
32h 25m2 stops
$710United Airlines
Find Deal
Thu, Feb 12 - Mon, Feb 16
Air Canada Logo
11:30 am - 7:57 pmFCO-STL
15h 27m1 stop
Air Canada Logo
1:30 pm - 9:15 amSTL-FCO
12h 45m1 stop
$720Air Canada
Find Deal
Wed, Oct 1 - Sun, Oct 5
Air Canada Logo
11:30 am - 3:18 pmFCO-STL
34h 48m2 stops
Air Canada Logo
1:30 pm - 9:15 amSTL-FCO
12h 45m1 stop
$721Air Canada
Find Deal
Wed, Oct 1 - Sun, Oct 5
Lufthansa Logo
1:30 pm - 1:55 pmFCO-STL
31h 25m1 stop
Lufthansa Logo
11:49 am - 7:55 amSTL-FCO
13h 06m1 stop
$729Lufthansa
Find Deal
Thu, Nov 27 - Mon, Dec 1
Multiple Airlines Logo
11:30 am - 3:18 pmFCO-STL
34h 48m2 stops
Multiple Airlines Logo
12:25 pm - 10:15 amSTL-FCO
14h 50m2 stops
$733Multiple Airlines
Find Deal
Wed, Oct 1 - Sun, Oct 5
Multiple Airlines Logo
11:30 am - 3:18 pmFCO-STL
34h 48m2 stops
Multiple Airlines Logo
12:25 pm - 10:15 amSTL-FCO
14h 50m2 stops
$738Multiple Airlines
Find Deal
Thu, Oct 2 - Mon, Oct 6
Lufthansa Logo
7:05 am - 2:55 pmFCO-STL
13h 50m1 stop
Lufthansa Logo
11:49 am - 7:55 amSTL-FCO
13h 06m1 stop
$792Lufthansa
Find Deal
Fri, Oct 31 - Fri, Nov 7
British Airways Logo
12:10 pm - 11:07 pmFCO-STL
17h 57m1 stop
British Airways Logo
1:03 pm - 11:20 amSTL-FCO
15h 17m1 stop
$802British Airways
Find Deal
Wed, Oct 1 - Sun, Oct 5
British Airways Logo
12:10 pm - 11:53 pmFCO-STL
18h 43m1 stop
British Airways Logo
8:05 pm - 7:15 pmSTL-FCO
16h 10m2 stops
$836British Airways
Find Deal
Thu, Oct 2 - Mon, Oct 6

Air Canada flights from Rome Fiumicino Airport to St. Louis

Our best Air Canada deals on Rome Fiumicino Airport to St. Louis flight tickets
Air Canada
Oct 1
FCO11:30 amRome Fiumicino
15h 27m
1 stop
STL7:57 pmLambert-St Louis
Oct 5
STL1:30 pmLambert-St Louis
12h 45m
1 stop
FCO9:15 amRome Fiumicino
$720
Find similar
Air Canada
Oct 1
FCO11:30 amRome Fiumicino
34h 48m
2 stops
STL3:18 pmLambert-St Louis
Oct 5
STL1:30 pmLambert-St Louis
12h 45m
1 stop
FCO9:15 amRome Fiumicino
$721
Find similar
Air Canada
Oct 1
FCO11:30 amRome Fiumicino
34h 48m
2 stops
STL3:18 pmLambert-St Louis
Oct 5
STL1:30 pmLambert-St Louis
12h 45m
1 stop
FCO9:15 amRome Fiumicino
$722
Find similar

Delta flights from Rome Fiumicino Airport to St. Louis

Our best Delta deals on Rome Fiumicino Airport to St. Louis flight tickets
Delta
Oct 14
FCO6:30 amRome Fiumicino
17h 59m
2 stops
STL5:29 pmLambert-St Louis
Apr 1
STL5:45 pmLambert-St Louis
16h 45m
2 stops
FCO5:30 pmRome Fiumicino
$825
Find similar
Delta
Oct 12
FCO6:30 amRome Fiumicino
23h 37m
2 stops
STL11:07 pmLambert-St Louis
Oct 27
STL2:15 pmLambert-St Louis
19h 05m
2 stops
FCO3:20 pmRome Fiumicino
$971
Find similar
Delta
Oct 12
FCO6:30 amRome Fiumicino
22h 08m
2 stops
STL9:38 pmLambert-St Louis
Oct 28
STL10:45 amLambert-St Louis
14h 10m
1 stop
FCO6:55 amRome Fiumicino
$974
Find similar

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 September 17, 2025.
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

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 11/27

1:30 pm-10:51 am

2 stops28h 21m

Lambert-St Louis

Mon 12/1

11:49 am-7:55 am

1 stop13h 06m

$709

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 2/12

9:40 am-9:00 pm

2 stops18h 20m

Lambert-St Louis

Mon 2/16

6:00 pm-9:25 am

2 stops32h 25m

$710

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Wed 10/1

11:30 am-7:57 pm

1 stop15h 27m

Lambert-St Louis

Sun 10/5

1:30 pm-9:15 am

1 stop12h 45m

$720

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Wed 10/1

11:30 am-3:18 pm

2 stops34h 48m

Lambert-St Louis

Sun 10/5

1:30 pm-9:15 am

1 stop12h 45m

$721

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 11/27

1:30 pm-1:55 pm

1 stop31h 25m

Lambert-St Louis

Mon 12/1

11:49 am-7:55 am

1 stop13h 06m

$729

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Wed 10/1

11:30 am-3:18 pm

2 stops34h 48m

Lambert-St Louis

Sun 10/5

12:25 pm-10:15 am

2 stops14h 50m

$733

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 10/2

11:30 am-3:18 pm

2 stops34h 48m

Lambert-St Louis

Mon 10/6

12:25 pm-10:15 am

2 stops14h 50m

$738

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Fri 10/31

7:05 am-2:55 pm

1 stop13h 50m

Lambert-St Louis

Fri 11/7

11:49 am-7:55 am

1 stop13h 06m

$792

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Wed 10/1

12:10 pm-11:07 pm

1 stop17h 57m

Lambert-St Louis

Sun 10/5

1:03 pm-11:20 am

1 stop15h 17m

$802

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 10/2

12:10 pm-11:53 pm

1 stop18h 43m

Lambert-St Louis

Mon 10/6

8:05 pm-7:15 pm

2 stops16h 10m

$836

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 day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Thursday when prices can be found for as low as $786. 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 Tuesday because tickets tend to average around $947. 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 Rome Fiumicino Airport at noon is the least expensive time of day to depart. momondo users have found prices as low as $929 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $947 per ticket.

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

You could potentially save up to 12% 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

Direct flights

None
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.
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  • 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
Florissant
Maryland Heights
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
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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