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 24 days ago

486,190 searches this week

171 airlines compared

80%+ AI score for best value

Fares are subject to change and may not be available for all dates. (Data last updated May 29, 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

October 5 - October 7

Cheapest

Best

STL - Belfast

$1,062

$872

Round trip

October 5 - October 11

STL - Belfast

$1,032

$884

Round trip

August 2 - August 10

Earliest

STL - Belfast

$1,067

$956

Round trip

September 9 - September 27

STL - Belfast

$898

$976

Round trip

August 9 - September 2

STL - Belfast

$1,040

$994

Round trip

August 23 - September 2

STL - Belfast

$1,086

$998

Round trip

August 9 - September 1

STL - Belfast

$1,049

$1,022

Round trip

August 9 - September 5

STL - Belfast

$1,040

$1,022

Round trip

August 9 - September 3

STL - Belfast

$1,040

$1,022

Round trip

August 23 - September 1

STL - Belfast

$1,096

$1,025

Round trip

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

Route Intelligence — 486,190 Searches this Week

Insights for flights from St. Louis to Belfast

Most itineraries for flights from St. Louis to Belfast connect at least once, as 0% of recent fares are non-stop. For connecting itineraries, the typical number of stopovers is 3.

If you are looking for cheap flights from St. Louis to Belfast, the journey time is typically 26h 26m, including connections. This reflects the median duration across all observed itineraries for this long-haul route.

Right now, fares for this route are below the typical level, with 61% of recent fares classified as a good price. Prices typically range from $501–$582, with a median of $533. New deals show up several times a week, so monitoring prices can be beneficial.

When is the cheapest time to fly from St. Louis to Belfast? The most affordable month to fly is July, with a median fare of $358. Following closely is April, where the median fare is $459. May also offers competitive pricing, with a median fare of $555.

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

Regular price: $887 - $1,600

Prices are currently below the regular range.

The regular price range for flights from St. Louis to Belfast is $887 to $1600. The current lowest deal is $872 with Frontier Airlines for travel from Oct 5-Oct 7.

now $872

Low $887

High $1,600

The cheapest time to fly from St. Louis to Belfast

The cheapest month to fly from St. Louis to Belfast is July, with a median price of $358. The most expensive month is June, with a median price of $561. Prices are generally lower from April to July.

July

Cheapest

Flights from $358

June

Most Expensive

Flights from $561

Apr

May

Jun

Jul

Direct flights from St. Louis to Belfast

Frontier Airlines

easyJet UK

KLM

Icelandair

Last-minute flights going from St. Louis to Belfast

Sun, Jun 21

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BHD)

Volaris

$1,268

$1,569

One-way

Sun, Jun 21

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BFS)

Frontier Airlines, Air France, easyJet UK

$1,164

$4,151

One-way

Sun, Jun 21

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BFS)

Frontier Airlines, Air France, easyJet UK

$1,155

$4,181

One-way

Wed, Jun 24

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BHD)

Air Canada, Air Transat, easyJet UK

$1,228

$2,366

One-way

Wed, Jun 24

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BFS)

Air Canada, Air Transat, easyJet UK

$1,331

$2,391

One-way

Sat, Jun 27

⌛ Last-Minute

STL - Belfast

St. Louis (STL) - Belfast (BFS)

Frontier Airlines, Air France, easyJet UK

$1,177

$3,887

One-way

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

2 nights

Oct 5 - Oct 7

$1,062 → $872

18%

6 nights

Oct 5 - Oct 11

$1,032 → $884

14%

8 nights

Aug 2 - Aug 10

$1,067 → $956

10%

3 nights

Aug 23 - Aug 26

$1,162 → $1,064

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 61% good prices.

📅 Best time to fly

Fly in July for the best prices

Historically, July is the cheapest month to fly from St. Louis to Belfast, with a median price of $358.

⏱️ Flight duration

Connecting flights take 26h 26m

The typical flight duration from St. Louis to Belfast is 26 hours and 26 minutes, with 3 stopovers.

✈️ Airlines & availability

Connecting flights only

There are no direct flights from St. Louis to Belfast. Consider connecting flights.

🏆 Airline highlight

Frontier Airlines offers connecting flights

Frontier Airlines has 40 connecting deals, making it a frequent option for this route.

🎯 Booking tip

Deals appear regularly

Deals for flights from St. Louis to Belfast appear regularly, about 0.2 times per day.

St. Louis main airports to depart from

St. Louis Lambert International (STL)

Cheapest

St. Louis Lambert International is a good choice for flights from St. Louis to Belfast.

📍 ~20 km from St. Louis (reachable by car or train)

💸 Flights from ~$872

Belfast main airports to arrive at

George Best Belfast City (BHD)

Cheapest

George Best Belfast City Airport is a convenient arrival option for flights from St. Louis to Belfast.

📍 ~5 km from Belfast city center (reachable by car)

💸 Flights from ~$806

Belfast International (BFS)

Belfast International Airport is another arrival option for your journey from St. Louis to Belfast.

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

💸 Flights from ~$872

Airports nearby Belfast used as alternative

George Best Belfast City (BHD)

Consider George Best Belfast City (BHD) for convenient access to Belfast city center, especially for domestic UK flights.

📍 ~5 km from Belfast (reachable by public transport)

💸 Flights from ~$806

Belfast International (BFS)

Belfast International (BFS) is the primary international gateway for Northern Ireland, offering many low-cost European routes.

📍 ~22 km from Belfast (reachable by car)

💸 Flights from ~$872

Dublin (DUB)

Cheapest

Dublin (DUB) is a major international hub with significant long-haul connectivity and often competitive pricing.

📍 ~140 km from Belfast (reachable by bus)

💸 Flights from ~$372

City of Derry (LDY)

City of Derry (LDY) offers a quiet terminal with fast processing, though it has limited flight options.

📍 ~95 km from Belfast (reachable by car)

💸 Flights from ~$993

Glasgow (GLA)

Glasgow (GLA) is a major UK hub with varied flights, but requires a sea crossing to reach Belfast.

📍 ~180 km from Belfast (reachable by ferry or flight)

💸 Flights from ~$829

Business & First Class Flight Deals to Belfast

76% AI deal score

$5,978

From STL

Elite

Aug 11

Belfast, United Kingdom

76% AI deal score

$6,024

From STL

Elite

Aug 20

Belfast, United Kingdom

76% AI deal score

$6,036

From STL

Elite

Aug 21

Belfast, United Kingdom

76% AI deal score

$6,095

From STL

Elite

Aug 24

Belfast, United Kingdom

76% AI deal score

$6,251

$6,239

Save $12

From STL

Elite

Aug 21

Belfast, United Kingdom

75% AI deal score

$6,153

From STL

Elite

Aug 22

Belfast, United Kingdom

75% AI deal score

$6,294

Frequently Asked Questions About Flights to Belfast

To find more affordable flights, consider being flexible with your travel dates and times. Comparing prices from various airlines and online travel agencies can also help uncover better deals. Setting up price alerts may notify you when fares drop for your desired route.

Booking flights in advance, often several months before your intended departure, can sometimes result in lower prices. However, prices can fluctuate, so monitoring fare trends may be beneficial. Last-minute bookings usually carry a higher cost.

Yes, comparing nearby airports for both your origin and destination can sometimes lead to 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 total cost and convenience.

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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

Route Intelligence — 486,190 Searches this Week

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

Fly in July for the best prices

Connecting flights take 26h 26m

Connecting flights only

Frontier Airlines offers connecting flights

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

Jul 04

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Aug 20

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Jul 31

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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