C$250 Cheap Flights from St Louis (STL) to Boise (BOI)

Compare St Louis to Boise flight deals

Find the cheapest month or even day of the year to fly to Boise

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Flight deals from St Louis to Boise

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to Boise Airport? If you want to travel next month, return fares start from C$564. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from St Louis to Boise

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Boise flights are currently cheapest in June.

St Louis to Boise: Alternative routes

Compare routes from St Louis to Boise below. You may find an airport to fly into that's cheaper, faster, or easier than Boise.

St Louis to Boise: Flight information

The things to know before you go.
Cheapest flight foundC$250
Cheapest month to flyJune

Finding cheap flights from St Louis to Boise: Frequently asked questions

The best price we found for a return flight from St Louis to Boise is C$372. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from St Louis to Boise. But we found flights with one or more stops from C$373.
As of May 2026, there are no flights flying from St Louis to Boise.
The cheapest month to fly from St Louis to Boise is usually July.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Boise Airport on Wednesday, July 1, 2026.
No airlines currently offer direct flights between St Louis Airport and Boise Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Boise but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Boise is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Frontier Airlines offers the cheapest flight tickets to Boise.

Traveling from Lambert-St. Louis International Airport (STL) to Boise Air Terminal (Gowen Field) (BOI): what you need to know

  • Longer lines at check-in and security are likely if you're flying during high season, so give yourself a little extra breathing room. A good general rule for peak times? Arrive up to four hours early for international flights and at least two hours for domestic departures.

  • We make it a piece of cake to book a flight with a stopover. To see all the options for flights from Lambert-St. Louis International Airport to Boise Air Terminal (Gowen Field), uncheck 'Direct flights only.' Then, pick a flight with a stop long enough to explore the city of your choice. Some popular stopovers between STL and BOI are:

    • Salt Lake City International Airport

    • Minneapolis-St. Paul International Airport

    • Denver International Airport

How to find the cheapest flights from Lambert-St. Louis International Airport (STL) to Boise Air Terminal (Gowen Field) (BOI)

  • The best price we've seen for a one-way ticket from Lambert-St. Louis International Airport to Boise Air Terminal (Gowen Field) is C$250. The cheapest price for a return flight is C$372. Remember that fares may change due to demand at the time of booking.

  • Don't wait until the last minute. You're more likely to get cheap flight tickets from STL to BOI if you book early. Airlines often have some fantastic early bird rates.

  • The 'Whole month' search function shows you the cheapest flight tickets from Lambert-St. Louis International Airport to Boise Air Terminal (Gowen Field) across the entire month. It's the best way to snap up a bargain if your plans aren't set in stone.

  • Snapping up a cheap ticket from STL to BOI is easy with Price Alerts. Simply create one of these automatic alerts and we'll get in touch as soon as the price has dropped.

  • Tailor your flights using filters. Pick your arrival and departure times, airlines and total journey duration. You can also sort results by 'Fastest,' 'Cheapest' or 'Best' flights from Lambert-St. Louis International Airport to Boise Air Terminal (Gowen Field).

Handy information about Lambert-St. Louis International Airport (STL)

  • Traveling from central St Louis to Lambert-St. Louis International Airport takes approximately 36 minutes by public transport. If you ride-share, drive or take a cab, you'll cover the 26 kilometres in 21 minutes or so, depending on traffic.

  • Want a handy hotel close to STL? If you're catching an early flight from Lambert-St. Louis International Airport to Boise Air Terminal (Gowen Field), these accommodation options will have you moments from your departure gate:

Arriving at Boise Air Terminal (Gowen Field) (BOI)

Getting from Boise Air Terminal (Gowen Field) (BOI) to central Boise

  • Boise Air Terminal (Gowen Field) is approximately 18 kilometres from the center of Boise. With your own car rental or in a cab, the drive is about 18 minutes.

  • It takes around 1 hour and 37 minutes when traveling by public transport.

When to fly to Boise Air Terminal (Gowen Field) (BOI)

  • July is the most popular month for flights from Lambert-St. Louis International Airport to Boise Air Terminal (Gowen Field). To skip the crowds, travel to Boise in May.

  • Book your flight from Lambert-St. Louis International Airport to Boise Air Terminal (Gowen Field) for July if you'd like to visit Boise during its warmest month. Expect temperatures of between 15ºC and 35ºC.

  • If you'd rather travel in cooler conditions, search for a cheap ticket from STL to BOI in January. Average temperatures are between -11ºC and 5ºC then.

More about Boise

  • Start your Boise trip right by finding a wonderful place to stay. As soon as you've booked your flight from STL to BOI, browse our hotel options including:

  • Idaho State Capitol Building and Old Idaho Penitentiary are a couple of big attractions to put on your Boise itinerary. Keep the adventure rolling by checking out Zoo Boise.

Complete your Boise trip with hotels and a car rental

  • You've booked a cheap ticket to Boise Air Terminal (Gowen Field) Airport — next up is finding somewhere to stay, and perhaps even your own set of wheels. We've compared prices across hundreds of companies to bring you the top hotels and car rental deals in Boise.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.