Title: Cheap Flights from St. Louis (STL) to Londonderry (LDY) - Expedia.ca ![Peace Bridge which includes a sunset, a bridge and heritage architecture](https://images.trvl-media.com/place/6179540/511ae287-37d1-4c60-be28-7c6823e7bb4c.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://a.travel-assets.com/travel-assets-manager/fallback-images-brand/bex_flights_v2.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # Cheap Flights from St. Louis (STL) to Londonderry (LDY) - [Roundtrip](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travellers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only ## Popular airlines from Lambert-St. Louis International Airport (STL) to Londonderry (LDY-City of Derry) - ![Air Canada](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AC.svg) Air Canada [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:ldy,departure:17/10/2025TANYT&leg2=from:ldy,to:stl,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AC"}}]) - ![WestJet](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_WS.svg) WestJet [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:ldy,departure:17/10/2025TANYT&leg2=from:ldy,to:stl,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"WS"}}]) - ![Flair Airlines](https://a.travel-assets.com/air/airlines/f8_sq.svg) Flair Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:ldy,departure:17/10/2025TANYT&leg2=from:ldy,to:stl,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"F8"}}]) - ![American Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AA.svg) American Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:ldy,departure:17/10/2025TANYT&leg2=from:ldy,to:stl,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AA"}}]) - ![United](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_UA.svg) United [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:ldy,departure:17/10/2025TANYT&leg2=from:ldy,to:stl,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) - ![Delta](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_DL.svg) Delta [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:ldy,departure:17/10/2025TANYT&leg2=from:ldy,to:stl,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) - ![Porter Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_PD.svg) Porter Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:stl,to:ldy,departure:17/10/2025TANYT&leg2=from:ldy,to:stl,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"PD"}}]) ![notification illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* ![deals illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 30% on select hotels after you book a flight\* ![trophy illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.ca/login) ## Frequently asked questions ### How much is a flight from STL to LDY? > Round-trip flights between Lambert Field and City of Derry Airport (LDY) start from . This figure is based on fares listed within the last 7 days on Expedia for flights departing within the next year — book now so you don't miss out. Prices and availability are subject to change. Additional terms apply. ### Do I need to pay a cancellation fee if I cancel my flight from STL to LDY? > This differs between airlines, as each has its own terms and conditions. Visit the [Customer Service Portal](https://www.expedia.ca/helpcenter), where you'll find instructions on how to cancel your flight online. ### How do I find cheap flights from Lambert Field to City of Derry Airport (LDY) that have flexible change policies? > Many airlines will allow you to reschedule your flight without charging a fee. All you pay is the fare difference. When searching for Lambert Field to LDY flights, you'll see a "No change fees" filter for you to pick. ### How far is the flight from Lambert-St. Louis Intl. Airport (STL) to City of Derry Airport (LDY)? > St. Louis to Londonderry is around 6,200 kilometres, so get ready to spend a while in the air. Don't forget to pack all the essentials, from your toothbrush to your hairbrush. Toss in a few snacks to nibble on throughout your flight too. ### Which airlines fly direct from STL to LDY? > You won't find any airlines flying directly between Lambert-St. Louis Intl. Airport (STL) and City of Derry Airport (LDY), so be ready to make at least one stop on your journey. A layover can be a welcome way to break up a trip! ### Are Lambert Field to Eglinton Airport flight tickets cheaper when they're purchased at the last minute? > Flight prices always go up and down, so there are no guarantees. While last-minute deals between Lambert-St. Louis Intl. Airport (STL) and Eglinton Airport are of course possible, it also makes sense to keep an eye on prices well before you fly. In fact, some airlines publicize their prices up to 12 months prior to the departure date. Expedia is continuously updating the biggest airfare bargains around, so keep checking and be ready to secure your seat when the price is low. ## Travel information | Origin airport | Lambert-St. Louis Intl. | | --- | --- | | Destination airport | City of Derry | | Distance | 6139 km | ## Book with confidence ### St. Louis to Londonderry Flights **The easy way to book your flights from St. Louis to Londonderry**  With Expedia, it’s simple to find and book flights to Londonderry from St. Louis whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from airlines that cover this route. There are nonstop flights to City of Derry, too.   Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from St. Louis to Londonderry today, tomorrow, or this week.   **Save dollars with cheap flights from Lambert-St. Louis Intl., STL to City of Derry, LDY**  Sort your search results by price to find great deals on your flight from St. Louis to Londonderry—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Londonderry from St. Louis currently is just rising to .   Here are more money-saving tips:  - Fly in when flight prices are normally at their lowest  - Book about a month to 6 weeks before you travel for the best prices to Londonderry   - Avoid peak season and weekends when flights can cost more - Early morning and late-night flights are sometimes cheaper, so try varying your travel times  - One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free!  **Reasons to choose Expedia for your flight to Londonderry from St. Louis**  Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. 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