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Cheap flights from Rome to St. Louis from $522

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 to St. Louis departing on 5/18. 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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Find the cheapest flights from Rome to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
1:30 pm - 11:44 pm
FCO
-
STL
17h 14m
1 stop
British Airways Logo
9:40 pm - 10:40 pm
STL
-
FCO
18h 00m
1 stop
$903British Airways
Thu, Jun 11 - Sun, Aug 30
British Airways Logo
10:00 am - 10:19 pm
FCO
-
STL
19h 19m
1 stop
British Airways Logo
9:40 pm - 10:40 pm
STL
-
FCO
18h 00m
1 stop
$905British Airways
Wed, May 20 - Sun, May 24
British Airways Logo
10:00 am - 11:54 pm
FCO
-
STL
20h 54m
1 stop
British Airways Logo
2:36 pm - 9:10 am
STL
-
FCO
11h 34m
1 stop
$912British Airways
Thu, May 21 - Mon, May 25
Lufthansa Logo
6:50 am - 9:22 pm
FCO
-
STL
21h 32m
2 stops
Lufthansa Logo
3:30 pm - 5:50 pm
STL
-
FCO
19h 20m
1 stop
$926Lufthansa
Sun, Sep 20 - Sun, Sep 27
Multiple Airlines Logo
6:50 am - 1:25 pm
FCO
-
STL
13h 35m
1 stop
Multiple Airlines Logo
1:00 pm - 8:15 am
STL
-
FCO
12h 15m
1 stop
$949Multiple Airlines
Sun, Sep 20 - Sun, Sep 27
Air Canada Logo
9:35 am - 8:25 pm
FCO
-
STL
17h 50m
2 stops
Air Canada Logo
1:05 pm - 9:15 am
STL
-
FCO
13h 10m
1 stop
$950Air Canada
Thu, May 21 - Mon, May 25
Lufthansa Logo
7:05 am - 2:55 pm
FCO
-
STL
13h 50m
1 stop
Lufthansa Logo
3:50 pm - 5:55 pm
STL
-
FCO
19h 05m
1 stop
$954Lufthansa
Sun, Oct 25 - Sun, Nov 1
United Airlines Logo
6:50 am - 6:41 pm
FCO
-
STL
18h 51m
2 stops
United Airlines Logo
1:27 pm - 1:15 pm
STL
-
FCO
16h 48m
2 stops
$955United Airlines
Sun, Sep 20 - Sun, Sep 27
Air Canada Logo
9:35 am - 8:25 pm
FCO
-
STL
17h 50m
2 stops
Air Canada Logo
2:15 pm - 10:20 am
STL
-
FCO
13h 05m
1 stop
$956Air Canada
Wed, May 20 - Sun, May 24
United Airlines Logo
11:30 am - 12:11 pm
FCO
-
STL
31h 41m
2 stops
United Airlines Logo
12:10 pm - 9:15 am
STL
-
FCO
14h 05m
1 stop
$958United Airlines
Thu, Jun 11 - Sun, Aug 30

Air Canada flights from Rome to St. Louis

Our best Air Canada deals on Rome to St. Louis flight tickets
Air Canada
May 21
FCO9:35 amRome Fiumicino
17h 50m
2 stops
STL8:25 pmLambert-St Louis
May 25
STL1:05 pmLambert-St Louis
13h 10m
1 stop
FCO9:15 amRome Fiumicino
$950
Air Canada
May 20
FCO9:35 amRome Fiumicino
17h 50m
2 stops
STL8:25 pmLambert-St Louis
May 24
STL2:15 pmLambert-St Louis
13h 05m
1 stop
FCO10:20 amRome Fiumicino
$956
Air Canada
Jun 11
FCO11:30 amRome Fiumicino
15h 55m
1 stop
STL8:25 pmLambert-St Louis
Aug 30
STL12:10 pmLambert-St Louis
16h 35m
1 stop
FCO11:45 amRome Fiumicino
$971

British Airways flights from Rome to St. Louis

Our best British Airways deals on Rome to St. Louis flight tickets
British Airways
Jun 11
FCO1:30 pmRome Fiumicino
17h 14m
1 stop
STL11:44 pmLambert-St Louis
Aug 30
STL9:40 pmLambert-St Louis
18h 00m
1 stop
FCO10:40 pmRome Fiumicino
$903
British Airways
May 20
FCO10:00 amRome Fiumicino
19h 19m
1 stop
STL10:19 pmLambert-St Louis
May 24
STL9:40 pmLambert-St Louis
18h 00m
1 stop
FCO10:40 pmRome Fiumicino
$905
British Airways
May 21
FCO10:00 amRome Fiumicino
20h 54m
1 stop
STL11:54 pmLambert-St Louis
May 25
STL2:36 pmLambert-St Louis
11h 34m
1 stop
FCO9:10 amRome Fiumicino
$912

momondo Fare Finder

 
Customize your flight search to find flights from Rome 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 5, 2026.
Use the filters below to find and compare flights from Rome 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 6/11

1:30 pm-11:44 pm

1 stop17h 14m

Lambert-St Louis

Sun 8/30

9:40 pm-10:40 pm

1 stop18h 00m

$903

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Wed 5/20

10:00 am-10:19 pm

1 stop19h 19m

Lambert-St Louis

Sun 5/24

9:40 pm-10:40 pm

1 stop18h 00m

$905

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 5/21

10:00 am-11:54 pm

1 stop20h 54m

Lambert-St Louis

Mon 5/25

2:36 pm-9:10 am

1 stop11h 34m

$912

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Sun 9/20

6:50 am-9:22 pm

2 stops21h 32m

Lambert-St Louis

Sun 9/27

3:30 pm-5:50 pm

1 stop19h 20m

$926
Quickest round-trip

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Sun 9/20

6:50 am-1:25 pm

1 stop13h 35m

Lambert-St Louis

Sun 9/27

1:00 pm-8:15 am

1 stop12h 15m

$949

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 5/21

9:35 am-8:25 pm

2 stops17h 50m

Lambert-St Louis

Mon 5/25

1:05 pm-9:15 am

1 stop13h 10m

$950

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Sun 10/25

7:05 am-2:55 pm

1 stop13h 50m

Lambert-St Louis

Sun 11/1

3:50 pm-5:55 pm

1 stop19h 05m

$954

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Sun 9/20

6:50 am-6:41 pm

2 stops18h 51m

Lambert-St Louis

Sun 9/27

1:27 pm-1:15 pm

2 stops16h 48m

$955

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Wed 5/20

9:35 am-8:25 pm

2 stops17h 50m

Lambert-St Louis

Sun 5/24

2:15 pm-10:20 am

1 stop13h 05m

$956

RomeSt. Louis

FCO - STL

FCOSTL

Rome Fiumicino

Thu 6/11

11:30 am-12:11 pm

2 stops31h 41m

Lambert-St Louis

Sun 8/30

12:10 pm-9:15 am

1 stop14h 05m

$958

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 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, March is the cheapest month to fly from Rome 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 April is another great option to travel to St. Louis, with average flight prices from Rome averaging around $793.

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

You could potentially save up to 36% on your flight if you consider stops on a Rome to St. Louis flight.

How have Rome to St. Louis flight prices changed over time?

As of May 2026, prices for Rome to St. Louis flights are approximately 0% more expensive when compared to flights at the same time last year.

When to book flights from Rome to St. Louis

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

Cheap Rome to St. Louis (ROM to STL) flight deals and tips

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

Fastest flight time

15h 30m

Direct flights

None
The fastest flight from Rome to St. Louis takes 15h 30m
There are no direct flights from Rome to St. Louis. There are no popular flight routes from Rome to St. Louis.
Search flight deals

Frequently asked questions about flying from Rome to St. Louis

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

    The distance between Rome and Lambert-St Louis is about 5053.3 mi. 15h 30m is a normal flight duration for this route.

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

    Prices for flights from Rome to Lambert-St Louis Airport were last updated today.

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Rome to Lambert-St Louis Airport.

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

    The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

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
Wentzville
Alton
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?

Finding the right flight to St. Louis from Rome is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

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

All flight searches from Rome to St. Louis on momondo can be filtered to show those which offer flexible booking policies.

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

momondo helps you find the best flight between Rome and St. Louis by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Price alerts on flights to St. Louis from Rome 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.

An easier way to manage your St. Louis trip

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