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Cheap flights from Rome to St. Louis from $475

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 9/16. 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 to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Iberia Logo
12:00 pm - 11:42 pmFCO  Rome Fiumicino-STL Lambert-St Louis
18h 42m2 stops Madrid Barajas Dallas/Fort Worth
Iberia Logo
10:16 am - 12:05 pmSTL  Lambert-St Louis-FCO Rome Fiumicino
18h 49m1 stop Dallas/Fort Worth
$1,029Iberia
Fri, Aug 21 - Tue, Aug 25
Iberia Logo
12:15 pm - 11:34 pmFCO  Rome Fiumicino-STL Lambert-St Louis
18h 19m1 stop Philadelphia
Iberia Logo
11:22 am - 7:05 amSTL  Lambert-St Louis-FCO Rome Fiumicino
12h 43m1 stop Philadelphia
$1,031Iberia
Fri, Aug 21 - Tue, Aug 25
Iberia Logo
12:00 pm - 11:42 pmFCO  Rome Fiumicino-STL Lambert-St Louis
18h 42m2 stops Madrid Barajas Dallas/Fort Worth
Iberia Logo
8:07 pm - 6:15 pmSTL  Lambert-St Louis-FCO Rome Fiumicino
15h 08m2 stops Chicago O'Hare Intl Madrid Barajas
$1,032Iberia
Fri, Aug 21 - Tue, Aug 25
Multiple Airlines Logo
8:10 am - 7:45 pmFCO  Rome Fiumicino-STL Lambert-St Louis
18h 35m2 stops Frankfurt am Main Boston Logan Intl
Multiple Airlines Logo
7:00 am - 3:50 pmSTL  Lambert-St Louis-FCO Rome Fiumicino
25h 50m2 stops Boston Logan Intl Frankfurt am Main
$1,046Multiple Airlines
Thu, Aug 20 - Mon, Aug 24
KLM Logo
9:40 pm - 5:53 pmFCO  Rome Fiumicino-STL Lambert-St Louis
27h 13m2 stops Naples Atlanta Hartsfield-Jackson
KLM Logo
11:00 am - 7:35 amSTL  Lambert-St Louis-FCO Rome Fiumicino
13h 35m1 stop Atlanta Hartsfield-Jackson
$1,070KLM
Thu, Aug 20 - Mon, Aug 24
Finnair Logo
10:00 am - 12:14 amFCO  Rome Fiumicino-STL Lambert-St Louis
21h 14m1 stop Chicago O'Hare Intl
Finnair Logo
12:45 pm - 12:05 pmSTL  Lambert-St Louis-FCO Rome Fiumicino
16h 20m1 stop Dallas/Fort Worth
$1,076Finnair
Wed, Aug 19 - Sun, Aug 23
Finnair Logo
10:00 am - 12:14 amFCO  Rome Fiumicino-STL Lambert-St Louis
21h 14m1 stop Chicago O'Hare Intl
Finnair Logo
12:45 pm - 12:05 pmSTL  Lambert-St Louis-FCO Rome Fiumicino
16h 20m1 stop Dallas/Fort Worth
$1,096Finnair
Wed, Aug 19 - Sun, Aug 23
Finnair Logo
10:00 am - 12:14 amFCO  Rome Fiumicino-STL Lambert-St Louis
21h 14m1 stop Chicago O'Hare Intl
Finnair Logo
12:55 pm - 12:05 pmSTL  Lambert-St Louis-FCO Rome Fiumicino
16h 10m1 stop Dallas/Fort Worth
$1,096Finnair
Thu, Aug 20 - Mon, Aug 24
Delta Logo
6:30 am - 8:42 pmFCO  Rome Fiumicino-STL Lambert-St Louis
21h 12m2 stops Amsterdam Schiphol Detroit Metropolitan Wayne County
Delta Logo
5:34 pm - 2:25 pmSTL  Lambert-St Louis-FCO Rome Fiumicino
13h 51m2 stops Minneapolis St Paul Paris Charles de Gaulle
$1,136Delta
Wed, Aug 19 - Sun, Aug 23
American Airlines Logo
10:00 am - 7:27 pmFCO  Rome Fiumicino-STL Lambert-St Louis
16h 27m1 stop Chicago O'Hare Intl
American Airlines Logo
9:40 pm - 11:45 pmSTL  Lambert-St Louis-FCO Rome Fiumicino
19h 05m1 stop London Heathrow
$1,138American Airlines
Wed, Aug 19 - Sun, Aug 23

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Finnair flights from Rome to St. Louis

Our best Finnair deals on Rome to St. Louis flight tickets
Finnair
Aug 19
FCO10:00 amRome Fiumicino
21h 14m
1 stop
STL12:14 amLambert-St Louis
Aug 23
STL12:45 pmLambert-St Louis
16h 20m
1 stop
FCO12:05 pmRome Fiumicino
$1,076
Finnair
Aug 19
FCO10:00 amRome Fiumicino
21h 14m
1 stop
STL12:14 amLambert-St Louis
Aug 23
STL12:45 pmLambert-St Louis
16h 20m
1 stop
FCO12:05 pmRome Fiumicino
$1,096

Delta flights from Rome to St. Louis

Our best Delta deals on Rome to St. Louis flight tickets
Delta
Aug 19
FCO6:30 amRome Fiumicino
21h 12m
2 stops
STL8:42 pmLambert-St Louis
Aug 23
STL5:34 pmLambert-St Louis
13h 51m
2 stops
FCO2:25 pmRome Fiumicino
$1,136
Delta
Aug 19
FCO6:30 amRome Fiumicino
21h 12m
2 stops
STL8:42 pmLambert-St Louis
Aug 23
STL3:39 pmLambert-St Louis
15h 46m
2 stops
FCO2:25 pmRome Fiumicino
$1,138
Delta
Aug 19
FCO6:30 amRome Fiumicino
18h 08m
2 stops
STL5:38 pmLambert-St Louis
Aug 23
STL6:00 amLambert-St Louis
18h 35m
1 stop
FCO7:35 amRome Fiumicino
$1,139

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 August 6, 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 Rome Fiumicino - STL Lambert-St Louis

FCOSTL

Rome Fiumicino

Fri 8/21

12:00 pm-11:42 pm

2 stops18h 42m

Lambert-St Louis

Tue 8/25

10:16 am-12:05 pm

1 stop18h 49m

$1,029
Quickest round-trip

RomeSt. Louis

FCO Rome Fiumicino - STL Lambert-St Louis

FCOSTL

Rome Fiumicino

Fri 8/21

12:15 pm-11:34 pm

1 stop18h 19m

Lambert-St Louis

Tue 8/25

11:22 am-7:05 am

1 stop12h 43m

$1,031

RomeSt. Louis

FCO Rome Fiumicino - STL Lambert-St Louis

FCOSTL

Rome Fiumicino

Fri 8/21

12:00 pm-11:42 pm

2 stops18h 42m

Lambert-St Louis

Tue 8/25

8:07 pm-6:15 pm

2 stops15h 08m

$1,032

RomeSt. Louis

FCO Rome Fiumicino - STL Lambert-St Louis

FCOSTL

Rome Fiumicino

Thu 8/20

8:10 am-7:45 pm

2 stops18h 35m

Lambert-St Louis

Mon 8/24

7:00 am-3:50 pm

2 stops25h 50m

$1,046

RomeSt. Louis

FCO Rome Fiumicino - STL Lambert-St Louis

FCOSTL

Rome Fiumicino

Thu 8/20

9:40 pm-5:53 pm

2 stops27h 13m

Lambert-St Louis

Mon 8/24

11:00 am-7:35 am

1 stop13h 35m

$1,070

RomeSt. Louis

FCO Rome Fiumicino - STL Lambert-St Louis

FCOSTL

Rome Fiumicino

Wed 8/19

10:00 am-12:14 am

1 stop21h 14m

Lambert-St Louis

Sun 8/23

12:45 pm-12:05 pm

1 stop16h 20m

$1,076

RomeSt. Louis

FCO Rome Fiumicino - STL Lambert-St Louis

FCOSTL

Rome Fiumicino

Wed 8/19

10:00 am-12:14 am

1 stop21h 14m

Lambert-St Louis

Sun 8/23

12:45 pm-12:05 pm

1 stop16h 20m

$1,096

RomeSt. Louis

FCO Rome Fiumicino - STL Lambert-St Louis

FCOSTL

Rome Fiumicino

Thu 8/20

10:00 am-12:14 am

1 stop21h 14m

Lambert-St Louis

Mon 8/24

12:55 pm-12:05 pm

1 stop16h 10m

$1,096

RomeSt. Louis

FCO Rome Fiumicino - STL Lambert-St Louis

FCOSTL

Rome Fiumicino

Wed 8/19

6:30 am-8:42 pm

2 stops21h 12m

Lambert-St Louis

Sun 8/23

5:34 pm-2:25 pm

2 stops13h 51m

$1,136

RomeSt. Louis

FCO Rome Fiumicino - STL Lambert-St Louis

FCOSTL

Rome Fiumicino

Wed 8/19

10:00 am-7:27 pm

1 stop16h 27m

Lambert-St Louis

Sun 8/23

9:40 pm-11:45 pm

1 stop19h 05m

$1,138

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, May 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 March is another great option to travel to St. Louis, with average flight prices from Rome averaging around $0.

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

You could potentially save up to 14% on your flight if you consider stops on a Rome to St. Louis flight.

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

18h 35m

Direct flights

None
The fastest flight from Rome to St. Louis takes 18h 35m
There are no direct flights from Rome to St. Louis. There are no popular flight routes from Rome to St. Louis.
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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. 18h 35m 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
Fairview Heights
Hermann
St. Peters
Maryland Heights
Florissant
Collinsville
Alton
O'Fallon
Clayton
Farmington
Fenton
Wentzville
Festus
Eureka
Edwardsville
Litchfield
Grafton
Shrewsbury

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.

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