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Cheap flights from Idaho to St. Louis (STL) from $150

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/13. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
BOI — STL
May 20 — May 271
From?
To?
Mon 5/20
Mon 5/27
1 adult, Economy
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What is the cheapest month to fly from Idaho to St. Louis?

February is one of the best times of the year to fly to St. Louis from Idaho. Prices for February average $474 per person but you can even find prices for as low as $323. The most expensive prices can be found in the month of July. Opting for a February flight can save you 27% on your journey compared to booking in July

When is the cheapest time to fly from Idaho to St. Louis (ID - STL)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Idaho to St. Louis as you normally would.

Cheap Spirit Airlines flights from Idaho to St. Louis

Explore cheap flight options specifically provided by Spirit Airlines for the route between Idaho and St. Louis. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,644,845 searches. Data last updated May 15, 2024.
Check out some of the cheapest Spirit Airlines flights we've come across from Idaho to St. Louis. Be sure to come back soon if the deals available don't appeal to you at this time.
Tue 7/95:39 pmBOI - STL
1 stop20h 27mSpirit Airlines
Fri 7/124:02 pmSTL - BOI
1 stop17h 54mSpirit Airlines
Deal found 5/14$217
Wed 8/2110:59 pmBOI - STL
1 stop17h 29mSpirit Airlines
Fri 8/233:02 pmSTL - BOI
1 stop8h 07mSpirit Airlines
Deal found 5/14$252
Tue 5/219:15 pmBOI - STL
1 stop12h 31mSpirit Airlines
Fri 5/244:05 pmSTL - BOI
1 stop29h 20mSpirit Airlines
Deal found 5/14$308

Cheap Alaska Airlines flights from Idaho to St. Louis

Explore cheap flight options specifically provided by Alaska Airlines for the route between Idaho and St. Louis. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,644,845 searches. Data last updated May 15, 2024.
Some of the best deals we've found on Alaska Airlines flights traveling from Idaho to St. Louis. Ensure the flight price, dates, time, and airline match your criteria before you book.
Thu 6/206:18 pmGEG - STL
2 stops17h 02mAlaska Airlines
Fri 6/217:32 pmSTL - GEG
1 stop6h 26mAlaska Airlines
Deal found 5/14$509
Tue 8/206:06 amIDA - STL
1 stop16h 53mAlaska Airlines
Sat 8/247:00 amSTL - IDA
1 stop9h 30mAlaska Airlines
Deal found 5/13$529
Thu 6/133:59 pmBOI - STL
1 stop7h 00mAlaska Airlines
Thu 6/207:32 pmSTL - BOI
2 stops23h 42mAlaska Airlines
Deal found 5/14$538
Sat 5/256:15 amGEG - STL
2 stops29h 21mAlaska Airlines
Wed 5/297:00 amSTL - GEG
1 stop9h 14mAlaska Airlines
Deal found 5/13$571
Sat 5/256:40 pmGEG - STL
2 stops23h 06mAlaska Airlines
Sat 6/227:32 pmSTL - GEG
1 stop6h 26mAlaska Airlines
Deal found 5/14$595
Sat 5/258:19 amGEG - STL
1 stop8h 22mAlaska Airlines
Wed 5/292:36 pmSTL - GEG
1 stop7h 13mAlaska Airlines
Deal found 5/13$612
Sun 5/265:40 amBOI - STL
1 stop6h 56mAlaska Airlines
Sun 6/27:41 pmSTL - BOI
2 stops27h 20mAlaska Airlines
Deal found 5/14$637
Tue 5/218:45 pmGEG - STL
2 stops14h 51mAlaska Airlines
Thu 5/237:00 amSTL - GEG
1 stop9h 14mAlaska Airlines
Deal found 5/14$697
Tue 5/216:15 amGEG - STL
2 stops15h 44mAlaska Airlines
Sun 5/267:41 pmSTL - GEG
1 stop6h 18mAlaska Airlines
Deal found 5/14$732

Cheap Idaho to St. Louis flights in May & June 2024

Find cheap flight options from Idaho to St. Louis specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,644,845 searches. Prices were last updated on May 15, 2024.
Scroll through some of the best deals on flights from Idaho to St. Louis in 2024. Check back in a little while for more flight options.
Tue 5/219:15 pmBOI - STL
1 stop12h 31mMultiple Airlines
Fri 5/249:45 amSTL - BOI
3 stops35h 40mMultiple Airlines
Deal found 5/14$280
Tue 6/113:12 pmGEG - STL
1 stop6h 38mAmerican Airlines
Tue 6/183:27 pmSTL - GEG
1 stop7h 49mAmerican Airlines
Deal found 5/14$301
Tue 5/219:15 pmBOI - STL
1 stop12h 31mSpirit Airlines
Fri 5/244:05 pmSTL - BOI
1 stop29h 20mSpirit Airlines
Deal found 5/14$308
Wed 6/126:37 amGEG - STL
1 stop8h 44mAmerican Airlines
Sat 6/153:27 pmSTL - GEG
1 stop7h 49mAmerican Airlines
Deal found 5/15$333
Wed 6/126:37 amGEG - STL
1 stop8h 44mAmerican Airlines
Sun 6/167:00 amSTL - GEG
1 stop6h 42mAmerican Airlines
Deal found 5/14$334
Tue 6/1112:33 pmGEG - STL
1 stop9h 10mDelta
Tue 6/187:55 amSTL - GEG
2 stops10h 03mDelta
Deal found 5/14$352
Thu 6/2010:33 pmGEG - STL
1 stop8h 00mAmerican Airlines
Fri 6/213:27 pmSTL - GEG
1 stop7h 49mAmerican Airlines
Deal found 5/15$363
Thu 6/1311:46 amBOI - STL
1 stop7h 38mAmerican Airlines
Thu 6/206:11 pmSTL - BOI
1 stop6h 05mAmerican Airlines
Deal found 5/14$366
Thu 6/203:12 pmGEG - STL
1 stop6h 38mAmerican Airlines
Fri 6/216:11 pmSTL - GEG
1 stop6h 49mAmerican Airlines
Deal found 5/14$366

Idaho to St. Louis 2024 flight deals

Discover exclusive flight deals for travel between Idaho and St. Louis in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,644,845 searches. Data last updated May 15, 2024.
Scroll through some of the best deals on flights from Idaho to St. Louis in 2024. Check back in a little while for more flight options.
Tue 7/95:39 pmBOI - STL
1 stop20h 27mSpirit Airlines
Fri 7/124:02 pmSTL - BOI
1 stop17h 54mSpirit Airlines
Deal found 5/14$217
Wed 8/2110:59 pmBOI - STL
1 stop17h 29mSpirit Airlines
Fri 8/233:02 pmSTL - BOI
1 stop8h 07mSpirit Airlines
Deal found 5/14$252
Tue 5/219:15 pmBOI - STL
1 stop12h 31mMultiple Airlines
Fri 5/249:45 amSTL - BOI
3 stops35h 40mMultiple Airlines
Deal found 5/14$280
Sat 8/3112:30 pmLWS - STL
1 stop7h 06mDelta
Wed 9/46:59 pmSTL - LWS
2 stops28h 01mDelta
Deal found 5/13$300
Tue 6/113:12 pmGEG - STL
1 stop6h 38mAmerican Airlines
Tue 6/183:27 pmSTL - GEG
1 stop7h 49mAmerican Airlines
Deal found 5/14$301
Fri 7/1910:00 amGEG - STL
1 stop5h 35mDelta
Mon 7/225:58 pmSTL - GEG
1 stop7h 36mDelta
Deal found 5/15$304
Wed 9/116:09 amGEG - STL
1 stop5h 59mAmerican Airlines
Tue 9/247:44 amSTL - GEG
1 stop6h 09mAmerican Airlines
Deal found 5/14$306
Tue 5/219:15 pmBOI - STL
1 stop12h 31mSpirit Airlines
Fri 5/244:05 pmSTL - BOI
1 stop29h 20mSpirit Airlines
Deal found 5/14$308
Wed 9/113:20 pmGEG - STL
2 stops7h 10mDelta
Tue 9/246:59 pmSTL - GEG
1 stop6h 48mDelta
Deal found 5/14$319

Idaho to St. Louis flights leaving soon

Find last-minute flight options from Idaho to St. Louis for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,644,845 searches. Data last updated May 15, 2024.
Have a look at some of the last-minute flights available departing from Idaho to St. Louis. It's wise to confirm all flight details are correct before booking.
Tue 5/219:15 pmBOI - STL
1 stop12h 31mMultiple Airlines
Fri 5/249:45 amSTL - BOI
3 stops35h 40mMultiple Airlines
Deal found 5/14$280
Tue 5/219:15 pmBOI - STL
1 stop12h 31mSpirit Airlines
Fri 5/244:05 pmSTL - BOI
1 stop29h 20mSpirit Airlines
Deal found 5/14$308
Sat 5/251:10 pmGEG - STL
1 stop6h 14mDelta
Wed 5/295:37 pmSTL - GEG
1 stop7h 15mDelta
Deal found 5/14$445
Tue 5/219:15 pmBOI - STL
3 stops16h 35mMultiple Airlines
Fri 5/248:35 pmSTL - BOI
3 stops24h 50mMultiple Airlines
Deal found 5/14$519
Sat 5/256:45 amGEG - STL
1 stop5h 30mDelta
Wed 5/295:30 pmSTL - GEG
2 stops8h 35mDelta
Deal found 5/14$562
Sat 5/256:15 amGEG - STL
2 stops29h 21mAlaska Airlines
Wed 5/297:00 amSTL - GEG
1 stop9h 14mAlaska Airlines
Deal found 5/13$571
Sat 5/2511:59 pmGEG - STL
1 stop8h 09mUnited Airlines
Sat 6/224:45 pmSTL - GEG
1 stop6h 12mUnited Airlines
Deal found 5/14$588
Sat 5/256:40 pmGEG - STL
2 stops23h 06mAlaska Airlines
Sat 6/227:32 pmSTL - GEG
1 stop6h 26mAlaska Airlines
Deal found 5/14$595
Sat 5/258:19 amGEG - STL
1 stop8h 22mAlaska Airlines
Wed 5/292:36 pmSTL - GEG
1 stop7h 13mAlaska Airlines
Deal found 5/13$612

One-way flights to St. Louis from Idaho

Search for one-way flight options from Idaho to St. Louis. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,644,845 searches. Data last updated May 15, 2024.
If you're seeking multiple options on one-way flights from Idaho to St. Louis, be sure to check out these deals, which are updated often. Those needing a return flight from Idaho to St. Louis can use the search form above.
Tue 8/1310:32 pmGEG - STL
1 stop7h 47mAmerican Airlines
Deal found 5/15$150
Wed 7/243:12 pmGEG - STL
1 stop6h 43mAmerican Airlines
Deal found 5/14$151
Mon 6/173:33 pmBOI - STL
1 stop6h 24mAmerican Airlines
Deal found 5/14$183
Mon 6/177:19 pmBOI - STL
3 stops18h 04mSpirit Airlines
Deal found 5/14$184
Tue 8/136:55 pmGEG - STL
2 stops12h 09mAlaska Airlines
Deal found 5/15$190
Tue 8/136:55 pmGEG - STL
2 stops12h 09mAlaska Airlines
Deal found 5/14$191
Wed 7/245:00 amGEG - STL
2 stops10h 34mDelta
Deal found 5/14$201
Fri 7/125:36 pmJAC - STL
1 stop6h 19mDelta
Deal found 5/14$245
Mon 6/175:35 pmBOI - STL
2 stops19h 39mUnited Airlines
Deal found 5/14$254

Find flights from Idaho to St. Louis within your budget

Customize your flight search to find flights from Idaho to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,644,845 searches. Data last updated May 15, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$217 - $509

Route

Depart

Return

Price

Boise Air Term. Gowen FldLambert-St Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 7/9

1 stop20h 27m

Lambert-St Louis

Fri 7/12

1 stop17h 54m

$217

Boise Air Term. Gowen FldLambert-St Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 8/21

1 stop17h 29m

Lambert-St Louis

Fri 8/23

1 stop8h 07m

$252

Lewiston Nez Perce RgnlLambert-St Louis

LWS - STL

LWSSTL

Lewiston Nez Perce Rgnl

Sat 8/31

1 stop7h 06m

Lambert-St Louis

Wed 9/4

2 stops32h 55m

$300

SpokaneLambert-St Louis

GEG - STL

GEGSTL

Spokane

Tue 6/11

1 stop6h 38m

Lambert-St Louis

Tue 6/18

1 stop7h 49m

$301

SpokaneLambert-St Louis

GEG - STL

GEGSTL

Spokane

Wed 9/11

1 stop5h 59m

Lambert-St Louis

Tue 9/24

1 stop6h 09m

$306

SpokaneLambert-St Louis

GEG - STL

GEGSTL

Spokane

Wed 9/11

2 stops7h 10m

Lambert-St Louis

Tue 9/24

1 stop6h 48m

$319

Boise Air Term. Gowen FldLambert-St Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 8/21

1 stop5h 55m

Lambert-St Louis

Fri 8/23

2 stops12h 15m

$407

Boise Air Term. Gowen FldLambert-St Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 6/13

1 stop16h 03m

Lambert-St Louis

Thu 6/20

3 stops33h 54m

$417

SpokaneLambert-St Louis

GEG - STL

GEGSTL

Spokane

Thu 6/20

2 stops17h 02m

Lambert-St Louis

Fri 6/21

1 stop6h 26m

$509

Flights are sorted by cheapest first

Deals found on 5/14

No data available for this route at this time. Please check back soon.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated May 15, 2024.
Peruse reviews from past customers who have flown with Spirit Airlines, Alaska Airlines and American Airlines from Idaho to St. Louis to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Food

7.3

Entertainment

7.3

Overall

8.1

Crew

8.6

Boarding

8.2

Comfort

7.9

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Alaska Airlines
8.1
Very good
9,157 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Food

7.3

Entertainment

7.3

Overall

8.1

Crew

8.6

Boarding

8.2

Comfort

7.9

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Delta
8.0
Very good
10,691 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Food

7.3

Entertainment

7.3

Overall

8.1

Crew

8.6

Boarding

8.2

Comfort

7.9

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

United Airlines
7.4
Good
10,946 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Food

7.3

Entertainment

7.3

Overall

8.1

Crew

8.6

Boarding

8.2

Comfort

7.9

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

American Airlines
7.3
Good
14,535 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Food

7.3

Entertainment

7.3

Overall

8.1

Crew

8.6

Boarding

8.2

Comfort

7.9

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Spirit Airlines
6.4
Okay
8,670 reviews
Alaska Airlines
8.1
Very good
9,157 reviews
Check prices

Food

7.3

Entertainment

7.3

Overall

8.1

Crew

8.6

Boarding

8.2

Comfort

7.9

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Related info for your journey

Find useful and relevant information for your journey from Idaho to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to St. Louis from Idaho?

    Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to St. Louis from Idaho.

  • Can I find flights from Idaho to St. Louis for under $300 on Cheapflights?

    Yes, there are multiple flights from Idaho to St. Louis for under $300. The cheapest flight booked recently is on Spirit Airlines for just $217, but on average you can expect to pay $327.

  • Are there last-minute flights available from Idaho to St. Louis for under $300?

    There are currently 18+ open flights from Idaho to St. Louis within the next 7 days for less than $300.

  • What are the cheapest airlines to fly from Idaho to St. Louis one-way?

    To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $150. Spirit Airlines flights start at $184 while deals on Alaska Airlines start at $190 one-way.

  • What are the most popular routes from Idaho to St. Louis?

    When deciding which route to take from Idaho to St. Louis consider Spokane - Lambert-St Louis, Boise Air Term. Gowen Fld - Lambert-St Louis or Idaho Falls Fanning Field - Lambert-St Louis as they are the most popular.

  • What are the most popular airlines that fly from Idaho to St. Louis?

    When booking a flight from Idaho to St. Louis, you may want to consider flying on American Airlines, Alaska Airlines or Delta as they are the most popular for this route.

  • What does BOI to STL mean?

    This is defined as Boise Air Term. Gowen Fld Airport (BOI) and Lambert-St Louis Airport (STL). Codes like Lambert-St Louis Airport are often used to just call airports uniquely. This flight route has multiple associated airports, so we think it might be helpful to learn the name and codes of them as well. They are Idaho Falls Fanning Field Airport (IDA), Hailey Sun Valley-Friedman Airport (SUN), Lewiston Nez Perce Rgnl Airport (LWS), Pocatello Airport (PIH), Twin Falls Joslin Airport (TWF).

  • Can I find deals for flights from Idaho to St. Louis that include extra baggage allowance?

    The amount of baggage you can bring on your Idaho to St. Louis flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Idaho to St. Louis with specific airlines?

    Yes, Cheapflights allows you to browse and filter Idaho to St. Louis flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Idaho to St. Louis that include hotel bookings?

    Yes. In addition to deals on Idaho to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Idaho to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to St. Louis.

  • Can I find deals for business class flights from Idaho to St. Louis?

    Yes. Cheapflights offers flight deals from Idaho to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Idaho to St. Louis that allow pets onboard?

    Many airlines flying from Idaho to St. Louis offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Idaho to St. Louis?

    Yes, you can often find last-minute deals on Idaho to St. Louis flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Idaho to St. Louis flight deals updated?

    The Idaho to St. Louis flight deals you see on this page were last updated on 5/15.

See more FAQs

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Alternative routes for Idaho to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.

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Top 5 airlines flying from Idaho to St. Louis

Discover the top 5 airlines that operate flights from Idaho to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,644,845 searches. Data last updated May 15, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$272Average$344FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
American AirlinesCheapest$287Average$469FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapest$297Average$599FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
United AirlinesCheapest$340Average$602FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Alaska AirlinesCheapest$354Average$373FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
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San Francisco to Shanghai flights
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USA to Amsterdam flights
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USA to Singapore flights
Idaho to Stockholm flights

Search flights from Idaho to St. Louis by cabin class

Find flights from Idaho to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
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Fly with Cheapflights

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How does Cheapflights help users find flights from Idaho to St. Louis?

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Why should you use Cheapflights to find cheap flight tickets from Idaho to St. Louis?

Cheapflights helps you find that perfect flight to St. Louis from Idaho by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Idaho to St. Louis with no change fees?

Certainly. Search results for flights to St. Louis from Idaho shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Idaho to St. Louis become cheaper?

Not ready to book yet? You can track prices for flights from Idaho to St. Louis on Cheapflights with our Price Alert feature and get notified when better prices are available.

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