Cheap Flights from St. Louis (STL) to Iasi (IAS)

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Iasi (IAS)

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Flights from St. Louis (STL) to Iasi (IAS)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Iasi
Distance
5379 mi

St. Louis to Iasi Flights

The cheapest times to fly from St. Louis to Iasi

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Iasi are during the month of . You can find some of the cheapest flights from St. Louis to Iasi with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Iasi

Sunday is one of the best days to book for cheap flights from St. Louis to Iasi: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Iasi

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Iasi in 2025. You can also book with separate airlines for your outbound and return journeys, from one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Iasi flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Iasi airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Iasi Airport (IAS) cost?
Discover the latest flight deals from STL to IAS by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from STL to IAS?
The cheapest flights from STL to IAS are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from STL to IAS?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from STL to IAS. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Iasi Airport (IAS)?
There aren't any daily direct flights departing from Lambert-St. Louis Intl. Airport (STL) to Iasi Airport (IAS). But you can opt for flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be cruising above the clouds in no time.
What day of the week has the most flights from STL to IAS?
Generally you'll have the most choice when it comes to flights on a Friday. Tuesdays are often the quietest.* However, this can vary depending on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Iasi Airport (IAS)?
To arrive at Iasi Airport (IAS) on schedule, choose a flight that leaves Lambert-St. Louis Intl. Airport (STL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Iasi Airport (IAS) last-minute?
Waiting until just before your departure to book a flight from STL to IAS often results in higher prices. Although you may find some last-minute discounts, they're not always guaranteed. Keep your travel schedule open to maximize your chances of snagging a bargain.
Is it cheaper to book a STL to IAS flight and hotel package?
Booking a STL to IAS flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip all in one place. Select from our wide range of hotels and then add flights, activities and car rentals to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Iasi Airport (IAS)?
If you reserved your STL to IAS flight within the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the ticket type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for further details.

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*Available to One Key members.