Are direct flights from St. Louis to Belfast always the best option?

Direct flights offer convenience by minimizing travel time and avoiding layovers. However, connecting flights can sometimes be more economical, especially for longer international routes. Weigh the cost savings against the added travel time and potential for delays.

Can flexible travel dates help on St. Louis to Belfast flights?

Being flexible with your travel dates can significantly impact the price of your flight. Mid-week travel or flying during off-peak seasons often results in lower fares. Adjusting your departure or return by a few days may reveal cheaper options.

What extra costs should I check before booking St. Louis to Belfast flights?

Before booking, always check for potential extra costs such as baggage fees, seat selection charges, and in-flight services. Some airlines may also charge for printing boarding passes at the airport. Factor these into your total travel budget.

Flights From St. Louis

To Belfast

Cheap Flights from St. Louis to Belfast

Browse current best options from St. Louis. Become a member to unlock all deals and get alerts when new deals appear.

Deals from

St. Louis

RatePunk searches hundreds of travel sites at once for deals on flights to Belfast

Prices updated 7 days ago

454 airlines compared

80%+ AI score for best value

Fares are subject to change and may not be available for all dates. (Data last updated Aug 24, 2026.)

Today’s best flight deals from St. Louis to Belfast

Explore current cheapest deals departing from St. Louis to Belfast

2026-10-19 – 2026-11-02
STL - Belfast
87% AI deal score
$902
$684
Round trip
2026-10-19 – 2026-11-02
STL - Belfast
86% AI deal score
$899
$686
Round trip
2026-10-21 – 2026-11-02
STL - Belfast
87% AI deal score
$905
$689
Round trip
2026-10-19 – 2026-11-09
STL - Belfast
86% AI deal score
$890
$692
Round trip
2026-10-19 – 2026-11-12
STL - Belfast
86% AI deal score
$890
$693
Round trip
2026-10-19 – 2026-11-09
STL - Belfast
86% AI deal score
$887
$694
Round trip
2026-10-19 – 2026-11-12
STL - Belfast
86% AI deal score
$888
$695
Round trip
2026-10-21 – 2026-11-12
STL - Belfast
86% AI deal score
$893
$698
Round trip
2026-10-19 – 2026-11-06
STL - Belfast
80% AI deal score
$894
$728
Round trip
2026-10-19 – 2026-11-06
STL - Belfast
80% AI deal score
$892
$730
Round trip

St. Louis to Belfast: Overview

Insights for flights from St. Louis to Belfast

Most itineraries from St. Louis to Belfast connect at least once, with 0% of recent fares being non-stop. For the majority of flights that include connections, travelers typically encounter 3 stopovers.

For those seeking cheap flights from St. Louis to Belfast, prices are currently below the typical level. Fares for this route typically range from $476–$582, with a median of $527. New deals show up several times a week, making it possible to find more favorable prices.

If you are wondering when is the cheapest time to fly from St. Louis to Belfast, the data indicates that July is typically the most affordable month, with a median fare of $358. April also offers competitive pricing, with a median fare of $459, followed by May at $555.

A typical journey from St. Louis to Belfast takes approximately 22h 34m, including connections. This is a long-haul flight, covering a distance of 6248 km.

How much is a round trip from St. Louis to Belfast

Regular price: $767 - $1,274

Prices for flights from St. Louis to Belfast are currently below the regular range.

The regular price range for this route is typically between $767 and $1274. The current lowest deal is $662 with Frontier Airlines, for travel from Oct 19 to Nov 2.

now $662

Low $767

High $1,274

The cheapest time to fly from St. Louis to Belfast

The cheapest month to fly from St. Louis to Belfast is August, with a median price of $320. The most expensive month is June, with a median price of $582. Prices are generally lower from February to November.

August

Cheapest

Flights from $320

June

Most Expensive

Flights from $582

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Direct flights from St. Louis to Belfast

Air Canada

easyJet UK

Aer Lingus

Frontier Airlines

Last-minute flights going from St. Louis to Belfast

Thu, Sep 24

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BHD)

British Airways

$924

$1,032

One-way

Mon, Nov 16

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BHD)

$884

$1,483

One-way

Biggest price drops on these dates for flights from St. Louis to Belfast

14 nights

Oct 19 - Nov 2

$902 → $671

26%

12 nights

Oct 21 - Nov 2

$905 → $676

25%

14 nights

Oct 19 - Nov 2

$899 → $674

25%

21 nights

Oct 19 - Nov 9

$890 → $671

25%

Popular Airports to fly from St. Louis to Belfast

St. Louis - Belfast route insights

💸 Price insights

Recent fares are below the typical level

Recent fares from St. Louis to Belfast are below the typical level at $662.

📅 Best time to fly

July is historically cheapest at $358

Historically, July is the cheapest month to fly from St. Louis to Belfast, at $358.

⏱️ Flight duration

Connecting flights average 22h 34m

Connecting flights from St. Louis to Belfast typically average 22 hours 34 minutes.

✈️ Airlines & availability

Connecting flights are dominant

Connecting flights are dominant for this route, with a median of 3 stopovers.

🏆 Airline highlight

Frontier Airlines offers a $662 deal

Frontier Airlines offers a recent deal for $662 from St. Louis to Belfast via kiwi.

🎯 Booking tip

Deals appear regularly

Deals for flights from St. Louis to Belfast appear regularly, so check frequently.

St. Louis main airports to depart from

St. Louis Lambert International (STL)

Cheapest

St. Louis Lambert International is a convenient departure airport for flights from St. Louis to Belfast.

📍 ~20 km from city center (reachable by car or train)

💸 Flights from ~$782

Belfast main airports to arrive at

George Best Belfast City (BHD)

Cheapest

George Best Belfast City Airport is a convenient arrival option for reaching Belfast and surrounding areas.

📍 ~4 km from city center (reachable by car)

💸 Flights from ~$693

Airports nearby Belfast used as alternative

Dublin (DUB)

Cheapest

Dublin Airport is a major international hub offering a significantly larger route network than Belfast.

📍 ~140 km from Belfast (reachable by bus and rail, requires border crossing)

💸 Flights from ~$343

Business & First Class Flight Deals to Belfast

Discover luxury on the budget with premium cabin class on flights from St. Louis to Belfast.

Elite

Best Elite deals to Belfast

Exclusive daily First Class, Business Class, and Premium Economy flight deals, refreshed every 24 hours.

From STL

Elite

Oct 19

Belfast, United Kingdom

88% AI deal score

$6,423

$4,840

Save $1,583

Air Canada, +1

Business Class

From STL

Elite

Oct 19

Belfast, United Kingdom

88% AI deal score

$6,403

$4,840

Save $1,563

Air Canada, +1

Business Class

From STL

Elite

Dec 20

Belfast, United Kingdom

88% AI deal score

$6,858

$4,840

Save $2,018

Air Canada, +1

Business Class

From STL

Elite

Dec 14

Belfast, United Kingdom

88% AI deal score

$6,718

$4,846

Save $1,872

Air Canada, +1

Business Class

From STL

Elite

Dec 14

Belfast, United Kingdom

88% AI deal score

$6,603

$4,846

Save $1,757

Air Canada, +1

Business Class

From STL

Elite

Dec 14

Belfast, United Kingdom

88% AI deal score

$6,717

$4,847

Save $1,870

Air Canada, +1

Business Class

From STL

Elite

Dec 20

Belfast, United Kingdom

88% AI deal score

$6,629

$4,896

Save $1,733

Air Canada, +1

Business Class

From STL

Elite

Sep 19

Belfast, United Kingdom

88% AI deal score

$6,829

$5,203

Save $1,626

Air Canada, +1

Business Class

From STL

Elite

Jan 12

Belfast, United Kingdom

83% AI deal score

$6,449

$4,896

Save $1,553

Air Canada, +1

Business Class

From STL

Elite

Nov 15

Belfast, United Kingdom

82% AI deal score

$5,962

$4,840

Save $1,122

Air Canada, +1

Business Class

From STL

Elite

Nov 13

Belfast, United Kingdom

82% AI deal score

$5,929

$4,880

Save $1,049

Air Canada, +1

Business Class

From STL

Elite

Jan 18

Belfast, United Kingdom

82% AI deal score

$6,096

$4,897

Save $1,199

Air Canada, +1

Business Class

Frequently Asked Questions About Flights to Belfast

To find more affordable flights, consider being flexible with your travel dates and times. Using flight comparison sites can help you compare prices across various airlines and booking platforms. Setting up price alerts may also notify you when fares drop.

Booking flights in advance often provides more options and potentially better prices. However, last-minute deals can sometimes appear, so it's wise to monitor fares if your travel plans allow for flexibility. The ideal booking window can vary.

Comparing nearby airports at both your origin and destination can sometimes uncover more affordable flight options. While it may add to your ground travel, the savings on airfare can occasionally be significant. Always factor in the total cost and convenience.

Related routes

More routes from St. Louis

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Flights to Belfast from other cities

Flights from Alicante to Belfast Flights from Amsterdam to Belfast Flights from Barcelona to Belfast Flights from Birmingham to Belfast Flights from Bristol to Belfast Flights from Edinburgh to Belfast Flights from Glasgow to Belfast Flights from Greensboro to Belfast Flights from Leeds to Belfast Flights from Liverpool to Belfast Flights from London to Belfast Flights from Manchester to Belfast

St. Louis to Belfast: Overview

Insights for flights from St. Louis to Belfast

A typical journey from St. Louis to Belfast takes approximately 22h 34m, including connections. This is a long-haul flight, covering a distance of 6248 km.

How much is a round trip from St. Louis to Belfast

Regular price: $767 - $1,274

Prices for flights from St. Louis to Belfast are currently below the regular range.

The regular price range for this route is typically between $767 and $1274. The current lowest deal is $662 with Frontier Airlines, for travel from Oct 19 to Nov 2.

now $662

Low $767

High $1,274

The cheapest time to fly from St. Louis to Belfast

August

Cheapest

Flights from $320

June

Most Expensive

Flights from $582

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Direct flights from St. Louis to Belfast

Air Canada

easyJet UK

Aer Lingus

Frontier Airlines

Last-minute flights going from St. Louis to Belfast

Thu, Sep 24

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BHD)

British Airways

$924

$1,032

One-way

Mon, Nov 16

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BHD)

$884

$1,483

One-way

Biggest price drops on these dates for flights from St. Louis to Belfast

14 nights

Oct 19 - Nov 2

$902 → $671

26%

12 nights

Oct 21 - Nov 2

$905 → $676

25%

14 nights

Oct 19 - Nov 2

$899 → $674

25%

21 nights

Oct 19 - Nov 9

$890 → $671

25%

Popular Airports to fly from St. Louis to Belfast

St. Louis - Belfast route insights

💸 Price insights

Recent fares are below the typical level

Recent fares from St. Louis to Belfast are below the typical level at $662.

📅 Best time to fly

July is historically cheapest at $358

Historically, July is the cheapest month to fly from St. Louis to Belfast, at $358.

⏱️ Flight duration

Connecting flights average 22h 34m

Connecting flights from St. Louis to Belfast typically average 22 hours 34 minutes.

✈️ Airlines & availability

Connecting flights are dominant

Connecting flights are dominant for this route, with a median of 3 stopovers.

🏆 Airline highlight

Frontier Airlines offers a $662 deal

Frontier Airlines offers a recent deal for $662 from St. Louis to Belfast via kiwi.

🎯 Booking tip

Deals appear regularly

Deals for flights from St. Louis to Belfast appear regularly, so check frequently.

St. Louis main airports to depart from

St. Louis Lambert International (STL)

Cheapest

St. Louis Lambert International is a convenient departure airport for flights from St. Louis to Belfast.

📍 ~20 km from city center (reachable by car or train)

💸 Flights from ~$782

Belfast main airports to arrive at

George Best Belfast City (BHD)

Cheapest

George Best Belfast City Airport is a convenient arrival option for reaching Belfast and surrounding areas.

📍 ~4 km from city center (reachable by car)

💸 Flights from ~$693

Airports nearby Belfast used as alternative

Dublin (DUB)

Cheapest

Dublin Airport is a major international hub offering a significantly larger route network than Belfast.

Belfast, United Kingdom

82% AI deal score

$6,096

$4,897

Save $1,199

Air Canada, +1

Business Class

Frequently Asked Questions About Flights to Belfast

Cheap Flights from St. Louis to Belfast

Today’s best flight deals from St. Louis to Belfast

St. Louis to Belfast: Overview

Insights for flights from St. Louis to Belfast

How much is a round trip from St. Louis to Belfast

The cheapest time to fly from St. Louis to Belfast

Direct flights from St. Louis to Belfast

Last-minute flights going from St. Louis to Belfast

Biggest price drops on these dates for flights from St. Louis to Belfast

Popular Airports to fly from St. Louis to Belfast

St. Louis - Belfast route insights

Recent fares are below the typical level

July is historically cheapest at $358

Connecting flights average 22h 34m

Connecting flights are dominant

Frontier Airlines offers a $662 deal

Deals appear regularly

St. Louis main airports to depart from

Belfast main airports to arrive at

Airports nearby Belfast used as alternative

Business & First Class Flight Deals to Belfast

Best Elite deals to Belfast

Oct 19

Oct 19

Dec 20

Dec 14

Dec 14

Dec 14

Dec 20

Sep 19

Jan 12

Nov 15

Nov 13

Jan 18

Frequently Asked Questions About Flights to Belfast

How can I find cheap flights from St. Louis to Belfast?

When should I book flights from St. Louis to Belfast?

Should I compare nearby airports for flights from St. Louis to Belfast?

Are direct flights from St. Louis to Belfast always the best option?

Can flexible travel dates help on St. Louis to Belfast flights?

What extra costs should I check before booking St. Louis to Belfast flights?

Related routes

More routes from St. Louis

Flights to Belfast from other cities

St. Louis to Belfast: Overview

Insights for flights from St. Louis to Belfast

How much is a round trip from St. Louis to Belfast

The cheapest time to fly from St. Louis to Belfast

Direct flights from St. Louis to Belfast

Last-minute flights going from St. Louis to Belfast

Biggest price drops on these dates for flights from St. Louis to Belfast

Popular Airports to fly from St. Louis to Belfast

St. Louis - Belfast route insights

Recent fares are below the typical level

July is historically cheapest at $358

Connecting flights average 22h 34m

Connecting flights are dominant

Frontier Airlines offers a $662 deal

Deals appear regularly

St. Louis main airports to depart from

Belfast main airports to arrive at

Airports nearby Belfast used as alternative

Business & First Class Flight Deals to Belfast

Best Elite deals to Belfast

Oct 19

Oct 19

Dec 20

Dec 14

Dec 14

Dec 14

Dec 20

Sep 19

Jan 12

Nov 15

Nov 13

Jan 18

Frequently Asked Questions About Flights to Belfast

How can I find cheap flights from St. Louis to Belfast?

When should I book flights from St. Louis to Belfast?

Should I compare nearby airports for flights from St. Louis to Belfast?