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

Direct flights offer convenience by minimizing travel time and avoiding layovers, but they are not always the most economical choice. Flights with one or more stops can often be cheaper, especially for longer international routes. Consider your budget and time constraints when deciding between direct and connecting flights.

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

Yes, being flexible with your travel dates can significantly impact the price of your flight. Mid-week flights or those during off-peak seasons often have lower fares than weekend or holiday travel. Adjusting your departure or return by even a few days may result in considerable savings.

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. Understanding these additional expenses can help you calculate the total cost of your trip accurately.

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 5 days ago

402 airlines compared

80%+ AI score for best value

Fares are subject to change and may not be available for all dates. (Data last updated Jul 12, 2026.)

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

Explore current cheapest deals departing from St. Louis to Belfast

Round trip

Sort by: Cheapest

September 28 - October 4

Cheapest

STL - Belfast

$922

$783

Round trip

September 28 - September 30

Best

STL - Belfast

$969

$791

Round trip

October 10 - October 15

STL - Belfast

$981

$849

Round trip

September 11 - September 23

STL - Belfast

$883

$858

Round trip

August 24 - September 23

Best

STL - Belfast

$1,020

$865

Round trip

August 24 - September 6

Best

STL - Belfast

$1,044

$874

Round trip

August 7 - August 13

STL - Belfast

$1,033

$875

Round trip

September 11 - September 20

STL - Belfast

$898

$879

Round trip

August 24 - September 20

STL - Belfast

$1,020

$890

Round trip

August 5 - August 11

Earliest

STL - Belfast

$1,141

$934

Round trip

Unlock all 500+ flight deals to Belfast and get alerts when great deals appear

St. Louis to Belfast: Overview

Insights for flights from St. Louis to Belfast

Most itineraries from St. Louis to Belfast connect at least once, as 0% of recent fares are non-stop. When connections are necessary, the typical number of stopovers is 3. This means you will almost certainly have to plan for at least one stop on your journey.

For travelers seeking cheap flights from St. Louis to Belfast, the journey typically takes 22h 34m including connections. This long-haul route covers a substantial distance of 6248 km, making it a significant international trip that requires careful planning.

When considering the cheapest time to fly from St. Louis to Belfast, July stands out with a median fare of $358. April also offers more affordable options, with a median fare of $459. Fares in May are somewhat higher, with a median of $555.

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

Regular price: $779 - $1,543

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

The regular price range for flights from St. Louis to Belfast is between $779 and $1543. The current lowest deal is $783 with Frontier Airlines for travel from Sep 28-Oct 4.

now $783

Low $779

High $1,543

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

WestJet

Frontier Airlines

Last-minute flights going from St. Louis to Belfast

Thu, Jul 16

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BFS)

Air Canada, easyJet UK

$1,183

$3,038

One-way

Thu, Jul 16

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BFS)

Air Canada, easyJet UK

$1,148

$3,978

One-way

Sun, Jul 26

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BFS)

Air Canada, WestJet, easyJet UK

$1,085

$1,293

One-way

Thu, Jul 30

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BFS)

Air Canada, easyJet UK

$1,077

$1,813

One-way

Thu, Jul 30

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BFS)

Air Canada, easyJet UK

$1,092

$2,402

One-way

Thu, Jul 30

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BFS)

Air Canada, easyJet UK

$1,119

$2,430

One-way

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

19 nights

Aug 7 - Aug 26

$1,035 → $744

28%

20 nights

Aug 7 - Aug 27

$1,031 → $743

28%

23 nights

Aug 3 - Aug 26

$1,029 → $745

28%

24 nights

Aug 3 - Aug 27

$1,021 → $745

27%

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, with deals around $783.

📅 Best time to fly

August is historically the cheapest month to fly.

Historically, August is the cheapest month to fly, with median prices around $320.

⏱️ Flight duration

Connecting flights typically take 22h 34m.

Flights from St. Louis to Belfast typically involve connections, with a median duration of 22h 34m.

✈️ Airlines & availability

Connecting flights are dominant on this route.

This route is connecting dominant, with a median of 3 stopovers when connecting.

🏆 Airline highlight

Air Canada has 31 direct deals.

📍 ~160 km from Belfast (reachable by bus or rail, requires border crossing)

💸 Flights from ~$370

City of Derry (LDY)

City of Derry Airport is a convenient alternative for regional UK domestic flights, avoiding border considerations.

📍 ~110 km from Belfast (reachable by car or less frequent public transport)

💸 Flights from ~$1,003

Glasgow (GLA)

Glasgow Airport is a major UK hub with extensive low-cost carrier presence, providing routes not available from Northern Irish airports.

📍 ~170 km from Belfast (requires ferry or separate flight)

💸 Flights from ~$614

Edinburgh Airport (EDI)

Edinburgh Airport is a large international gateway with a wide variety of global destinations and excellent facilities.

📍 ~200 km from Belfast (requires ferry or separate flight)

💸 Flights from ~$669

Ireland West Airport Knock (NOC)

Ireland West Airport Knock serves several European leisure destinations and is accessible by road.

📍 ~240 km from Belfast (reachable by car, limited direct public transport)

💸 Flights from ~$964

Business & First Class Flight Deals to Belfast

78% AI deal score

$5,757

$5,312

Save $445

Frequently Asked Questions About Flights to Belfast

To find more affordable flights, consider being flexible with your travel dates and times. Comparing prices across different airlines and booking sites can also help you discover better deals. Setting up price alerts may notify you when fares drop for your desired route.

Booking in advance often provides more options and potentially better prices, though last-minute deals can sometimes appear. Generally, monitoring prices over a few weeks before your intended travel can help you identify a good booking window. Prices may fluctuate based on demand and seasonality.

Comparing nearby airports at both your origin and destination can sometimes reveal more affordable flight options. While it may add to your ground travel time, the potential savings on airfare can be significant. Always factor in the cost and convenience of transportation to and from alternative airports.

Related routes

Consider alternative routes from St. Louis

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Cheap Flights from St. Louis to Belfast

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

Unlock all 500+ flight deals to Belfast and get alerts when great deals appear

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.

August is historically the cheapest month to fly.

Connecting flights typically take 22h 34m.

Connecting flights are dominant on this route.

Air Canada has 31 direct deals.

Deals appear regularly for this route.

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

Sep 21

Sep 21

Sep 21

Sep 21

Jul 23

Jul 15

Aug 31

Oct 18

Jul 12

Sep 14

Aug 27

Aug 27

Oct 12

Sep 14

Sep 14

Sep 14

Oct 02

Aug 17

Aug 17

Aug 17

Aug 31

Aug 12

Aug 17

Jul 29

Aug 27

Aug 31

Aug 12

Aug 12

Aug 12

Oct 05

Aug 27

Aug 27

Frequently Asked Questions About Flights to Belfast

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

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

When should I book 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?

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

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

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

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

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

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

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

Related routes

Consider alternative routes from St. Louis