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Cheap flights from Idaho to St. Louis (STL) from $53

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 5/21. 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 11 — May 181
From?
To?
Sat 5/11
Sat 5/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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 $475 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 29% 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 2,689,106 searches. Data last updated May 6, 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 5/215:20 pmBOI - STL
1 stop16h 26mSpirit Airlines
Tue 6/410:34 amSTL - BOI
3 stops29h 39mSpirit Airlines
Deal found 5/4$163
Thu 5/308:50 pmBOI - STL
1 stop17h 24mSpirit Airlines
Fri 6/73:07 pmSTL - BOI
1 stop22h 46mSpirit Airlines
Deal found 5/5$195
Tue 6/49:15 pmBOI - STL
1 stop14h 50mSpirit Airlines
Tue 6/113:23 pmSTL - BOI
3 stops29h 47mSpirit Airlines
Deal found 5/5$207
Wed 5/295:20 pmBOI - STL
3 stops24h 20mSpirit Airlines
Wed 6/51:55 pmSTL - BOI
1 stop7h 15mSpirit Airlines
Deal found 5/5$215
Tue 6/255:39 pmBOI - STL
1 stop18h 26mSpirit Airlines
Fri 7/123:07 pmSTL - BOI
1 stop7h 30mSpirit Airlines
Deal found 5/5$252
Sat 5/254:54 pmBOI - STL
3 stops24h 46mSpirit Airlines
Tue 6/410:34 amSTL - BOI
3 stops29h 39mSpirit Airlines
Deal found 5/4$289
Tue 6/255:39 pmBOI - STL
1 stop18h 26mSpirit Airlines
Fri 7/123:07 pmSTL - BOI
1 stop7h 30mSpirit Airlines
Deal found 5/6$312
Fri 5/2410:54 amBOI - STL
2 stops22h 34mSpirit Airlines
Tue 6/410:34 amSTL - BOI
3 stops29h 39mSpirit Airlines
Deal found 5/4$344
Sat 5/254:54 pmBOI - STL
3 stops24h 46mSpirit Airlines
Sun 6/27:30 pmSTL - BOI
3 stops25h 55mSpirit Airlines
Deal found 5/5$366

Cheap Delta flights from Idaho to St. Louis

Explore cheap flight options specifically provided by Delta 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 2,689,106 searches. Data last updated May 6, 2024.
Some of the best deals we've found on Delta flights traveling from Idaho to St. Louis. Ensure the flight price, dates, time, and airline match your criteria before you book.
Sat 8/3112:30 pmLWS - STL
1 stop7h 06mDelta
Wed 9/46:59 pmSTL - LWS
2 stops28h 01mDelta
Deal found 5/5$300
Wed 5/297:05 pmBOI - STL
1 stop4h 41mDelta
Wed 6/55:37 pmSTL - BOI
1 stop7h 13mDelta
Deal found 5/5$304
Fri 9/611:15 amGEG - STL
1 stop8h 14mDelta
Mon 9/92:20 pmSTL - GEG
1 stop5h 40mDelta
Deal found 5/5$324
Wed 5/292:31 pmBOI - STL
2 stops9h 15mDelta
Wed 6/55:30 pmSTL - BOI
1 stop7h 44mDelta
Deal found 5/5$333
Tue 8/202:00 pmGEG - STL
1 stop5h 29mDelta
Sun 8/256:30 amSTL - GEG
1 stop5h 37mDelta
Deal found 5/5$335
Tue 8/2012:45 pmGEG - STL
1 stop8h 54mDelta
Tue 8/276:30 amSTL - GEG
2 stops12h 32mDelta
Deal found 5/5$348
Tue 8/2012:45 pmGEG - STL
1 stop8h 54mDelta
Sun 8/252:20 pmSTL - GEG
2 stops8h 38mDelta
Deal found 5/5$353
Tue 6/42:31 pmBOI - STL
2 stops9h 25mDelta
Tue 6/115:56 pmSTL - BOI
1 stop8h 01mDelta
Deal found 5/5$354
Thu 5/305:59 pmBOI - STL
1 stop5h 47mDelta
Sun 6/25:39 pmSTL - BOI
1 stop7h 11mDelta
Deal found 5/5$365

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 2,689,106 searches. Prices were last updated on May 6, 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 5/215:20 pmBOI - STL
1 stop16h 26mSpirit Airlines
Tue 6/410:34 amSTL - BOI
3 stops29h 39mSpirit Airlines
Deal found 5/4$163
Thu 5/308:50 pmBOI - STL
1 stop17h 24mSpirit Airlines
Fri 6/73:07 pmSTL - BOI
1 stop22h 46mSpirit Airlines
Deal found 5/5$195
Tue 6/49:15 pmBOI - STL
1 stop14h 50mSpirit Airlines
Tue 6/113:23 pmSTL - BOI
3 stops29h 47mSpirit Airlines
Deal found 5/5$207
Wed 5/295:20 pmBOI - STL
3 stops24h 20mSpirit Airlines
Wed 6/51:55 pmSTL - BOI
1 stop7h 15mSpirit Airlines
Deal found 5/5$215
Thu 5/3010:48 pmBOI - STL
1 stop15h 26mMultiple Airlines
Fri 6/76:10 pmSTL - BOI
2 stops19h 43mMultiple Airlines
Deal found 5/5$251
Tue 6/255:39 pmBOI - STL
1 stop18h 26mSpirit Airlines
Fri 7/123:07 pmSTL - BOI
1 stop7h 30mSpirit Airlines
Deal found 5/5$252
Thu 5/3010:48 pmBOI - STL
1 stop15h 26mMultiple Airlines
Sat 6/811:34 amSTL - BOI
2 stops24h 49mMultiple Airlines
Deal found 5/5$273
Thu 5/308:50 pmBOI - STL
2 stops14h 38mMultiple Airlines
Fri 6/76:10 pmSTL - BOI
2 stops19h 43mMultiple Airlines
Deal found 5/5$283
Sat 5/254:54 pmBOI - STL
3 stops24h 46mSpirit Airlines
Tue 6/410:34 amSTL - BOI
3 stops29h 39mSpirit Airlines
Deal found 5/4$289

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 2,689,106 searches. Data last updated May 6, 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 5/215:20 pmBOI - STL
1 stop16h 26mSpirit Airlines
Tue 6/410:34 amSTL - BOI
3 stops29h 39mSpirit Airlines
Deal found 5/4$163
Thu 5/308:50 pmBOI - STL
1 stop17h 24mSpirit Airlines
Fri 6/73:07 pmSTL - BOI
1 stop22h 46mSpirit Airlines
Deal found 5/5$195
Tue 6/49:15 pmBOI - STL
1 stop14h 50mSpirit Airlines
Tue 6/113:23 pmSTL - BOI
3 stops29h 47mSpirit Airlines
Deal found 5/5$207
Wed 5/295:20 pmBOI - STL
3 stops24h 20mSpirit Airlines
Wed 6/51:55 pmSTL - BOI
1 stop7h 15mSpirit Airlines
Deal found 5/5$215
Thu 5/3010:48 pmBOI - STL
1 stop15h 26mMultiple Airlines
Fri 6/76:10 pmSTL - BOI
2 stops19h 43mMultiple Airlines
Deal found 5/5$251
Tue 6/255:39 pmBOI - STL
1 stop18h 26mSpirit Airlines
Fri 7/123:07 pmSTL - BOI
1 stop7h 30mSpirit Airlines
Deal found 5/5$252
Thu 5/3010:48 pmBOI - STL
1 stop15h 26mMultiple Airlines
Sat 6/811:34 amSTL - BOI
2 stops24h 49mMultiple Airlines
Deal found 5/5$273
Thu 5/308:50 pmBOI - STL
2 stops14h 38mMultiple Airlines
Fri 6/76:10 pmSTL - BOI
2 stops19h 43mMultiple Airlines
Deal found 5/5$283
Sat 5/254:54 pmBOI - STL
3 stops24h 46mSpirit Airlines
Tue 6/410:34 amSTL - BOI
3 stops29h 39mSpirit Airlines
Deal found 5/4$289

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 2,689,106 searches. Data last updated May 6, 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.
Sat 5/119:15 pmBOI - STL
3 stops19h 14mMultiple Airlines
Mon 5/138:55 pmSTL - BOI
3 stops24h 30mMultiple Airlines
Deal found 5/4$518
Sat 5/115:00 amBOI - STL
3 stops16h 45mUnited Airlines
Mon 5/134:51 pmSTL - BOI
1 stop7h 13mUnited Airlines
Deal found 5/4$638
Sat 5/115:23 amBOI - STL
1 stop7h 52mDelta
Tue 5/146:00 amSTL - BOI
1 stop8h 45mDelta
Deal found 5/5$666
Sat 5/116:35 amBOI - STL
2 stops8h 11mUnited Airlines
Tue 5/146:00 amSTL - BOI
1 stop7h 04mUnited Airlines
Deal found 5/4$671
Sat 5/115:00 amBOI - STL
3 stops16h 45mUnited Airlines
Mon 5/134:51 pmSTL - BOI
2 stops19h 59mUnited Airlines
Deal found 5/4$672
Sat 5/116:35 amBOI - STL
2 stops8h 11mUnited Airlines
Tue 5/1410:10 amSTL - BOI
2 stops12h 14mUnited Airlines
Deal found 5/4$676
Sat 5/115:23 amBOI - STL
1 stop7h 52mDelta
Mon 5/137:55 amSTL - BOI
1 stop5h 27mDelta
Deal found 5/4$687
Sat 5/1110:36 amBOI - STL
2 stops10h 13mUnited Airlines
Mon 5/134:51 pmSTL - BOI
1 stop5h 33mUnited Airlines
Deal found 5/4$767

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 2,689,106 searches. Data last updated May 6, 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 5/215:20 pmBOI - STL
1 stop16h 26mSpirit Airlines
Deal found 5/5$53
Tue 6/255:39 pmBOI - STL
1 stop18h 26mSpirit Airlines
Deal found 5/5$115
Wed 5/295:20 pmBOI - STL
3 stops24h 20mSpirit Airlines
Deal found 5/5$141
Thu 6/279:13 pmBOI - STL
1 stop16h 03mSpirit Airlines
Deal found 5/5$144
Wed 5/295:59 pmBOI - STL
1 stop5h 47mDelta
Deal found 5/5$152
Wed 5/292:31 pmBOI - STL
2 stops9h 15mDelta
Deal found 5/5$181
Thu 6/277:27 pmBOI - STL
2 stops16h 13mMultiple Airlines
Deal found 5/5$182
Thu 8/112:59 amBOI - STL
1 stop7h 30mAmerican Airlines
Deal found 5/4$183
Fri 5/1710:54 amBOI - STL
3 stops28h 31mSpirit Airlines
Deal found 5/5$193

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 2,689,106 searches. Data last updated May 6, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$163 - $466

Route

Depart

Return

Price

Boise Air Term. Gowen FldLambert-St Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 5/21

1 stop16h 26m

Lambert-St Louis

Tue 6/4

3 stops29h 39m

$163

Boise Air Term. Gowen FldLambert-St Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 5/30

1 stop17h 24m

Lambert-St Louis

Fri 6/7

1 stop22h 46m

$195

Boise Air Term. Gowen FldLambert-St Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 6/4

1 stop14h 50m

Lambert-St Louis

Tue 6/11

3 stops29h 47m

$207

Boise Air Term. Gowen FldLambert-St Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 5/29

3 stops24h 20m

Lambert-St Louis

Wed 6/5

1 stop7h 15m

$215

Boise Air Term. Gowen FldLambert-St Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 5/30

1 stop15h 26m

Lambert-St Louis

Fri 6/7

2 stops19h 43m

$251

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 stops28h 01m

$300

SpokaneLambert-St Louis

GEG - STL

GEGSTL

Spokane

Tue 8/20

1 stop7h 47m

Lambert-St Louis

Tue 8/27

1 stop10h 03m

$301

Boise Air Term. Gowen FldLambert-St Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sat 5/25

1 stop7h 57m

Lambert-St Louis

Tue 6/4

1 stop8h 07m

$383

Lewiston Nez Perce RgnlLambert-St Louis

LWS - STL

LWSSTL

Lewiston Nez Perce Rgnl

Sat 8/31

1 stop5h 08m

Lambert-St Louis

Wed 9/4

1 stop15h 14m

$466

Flights are sorted by cheapest first

Deals found on 5/4

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 6, 2024.
Peruse reviews from past customers who have flown with Spirit Airlines, Delta 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
9,137 reviews
Check prices

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Boarding

8.2

Overall

8.1

Reviews

1 / 10

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

Alaska Airlines
8.1
Very good
9,137 reviews
Alaska Airlines
8.1
Very good
9,137 reviews
Check prices

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Boarding

8.2

Overall

8.1

Reviews

1 / 10

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

Delta
8.1
Very good
10,818 reviews
Alaska Airlines
8.1
Very good
9,137 reviews
Check prices

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Boarding

8.2

Overall

8.1

Reviews

1 / 10

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

United Airlines
7.4
Good
11,090 reviews
Alaska Airlines
8.1
Very good
9,137 reviews
Check prices

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Boarding

8.2

Overall

8.1

Reviews

1 / 10

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

American Airlines
7.3
Good
14,697 reviews
Alaska Airlines
8.1
Very good
9,137 reviews
Check prices

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Boarding

8.2

Overall

8.1

Reviews

1 / 10

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

Spirit Airlines
6.4
Okay
8,714 reviews
Alaska Airlines
8.1
Very good
9,137 reviews
Check prices

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Boarding

8.2

Overall

8.1

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 $200 on Cheapflights?

    Yes, there are multiple flights from Idaho to St. Louis for under $200. The cheapest flight booked recently is on Spirit Airlines for just $163, but on average you can expect to pay $280.

  • Are there last-minute flights available from Idaho to St. Louis for under $600?

    There are currently 8+ open flights from Idaho to St. Louis within the next 7 days for less than $600.

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

    To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $53. Delta flights start at $152 while deals on American Airlines start at $183 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 5/5.

See more FAQs

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Alternative routes for Idaho to St. Louis
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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 2,689,106 searches. Data last updated May 6, 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$589FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
United AirlinesCheapest$339Average$599FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Alaska AirlinesCheapest$354Average$559FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
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San Francisco to Shanghai flights
New York to Tampa flights
USA to Amsterdam flights
Salt Lake City to Denver flights
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Chicago to Phoenix flights
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
Economy Class

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to St. Louis from Idaho today with Cheapflights!

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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