Find cheap flights from St. Louis to Idaho Falls

STL - IDA

Find cheap flights from St. Louis to Idaho Falls

Round-trip
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St. Louis (STL)
Idaho Falls Fanning Field
Wed 12/2
Wed 12/9
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Good to know

Low season

July Best time to beat the crowds with an average 38% drop in price.

High season

June Most popular time to fly with an average 22% increase in price.

Average price round-trip

$444 (avg. price over the last 2 weeks)

Good deal round-trip

$400 or less

Good deal one-way

$286 or less

When to book flights from St. Louis to Idaho Falls

Estimated round-trip price
Average price per month

Top tips for finding a cheap flight

  • Looking for a cheap flight? 25% of our users found flights on this route for $286 or less one-way and $400 or less round-trip.
  • High season is considered to be May, June and July. The cheapest month to fly is July.

FAQs for booking flights from St. Louis to Idaho Falls

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Top airlines flying Lambert-St Louis to Idaho Falls Fanning Field

Scores according to KAYAK customer reviews

7.9
Delta
Overall score based on 28,802 reviews
8.1
Boarding
7.8
Comfort
8.5
Crew
7.8
Entertainment
7.5
Food
Airline reviews

Pros: "Nothing, the flight was canceled without a refund. I highly recommend canceling all business with kiwi in the future."
Cons: "My flight could have occurred or I could have been refunded."

Pros: "Being on time with everything."
Cons: "Nothing"

Cons: "Really felt happy on time touch down nice journey with delta"

Pros: "Friendly crew"

Pros: "The where very helpful"
Cons: "Nothing"

Pros: "48 hours travel from Europe Thanks to sucky Delta airlines that are absolutely the most horrible company Never ever again"

Cons: "A late flight due to a mechanical problem. Missed connection and Delta was of little help."

Pros: "The crew was amazing! The seat was comfortable."
Cons: "Used the self check in kiosk to begin! That was awesome! But after that I still had to stand in line to check in my bags. That part of the process took a bit longer than expected."

Pros: "Delta’s crew is the best part about flying delta!"

Pros: "Nothing special"
Cons: "That was the most uncomfortable and cramped seat I had ever had on a plane flight. Even sitting on the pillow did not help."

Pros: "I like that I arrived at my destination safely."
Cons: "My allergies were bothering me due to the airlines allowing animals to travel as passengers, in this case a rabbit. I am very allergic to animals. My breathing was compromised."

Pros: "This had one of the best attendants I have encountered. She was extra friendly and made us feel good."

Cons: "The flight was 2 hours delayed.. this cause a lot of inconvienece.."

Pros: "Nothing."
Cons: "Somehow they didn’t serve snacks and drinks, I’ve been being thirsty and hungry, at the last 30mns I felt like I wanna throw up. We landed around 30mns ago and now no gates ready for us to get out of here. Still waiting inside the plane."

Pros: "Everything was on time and efficient. I also liked that the captain came on and updated us on arrival, turbulence, weather, etc."

Pros: "Liked the food, the crew were cheerful and helpful. Service was great."
Cons: "KLM staff at the AMS airport were not helpful. She insisted that our luggage weigh exactly 23kg. At 23.7, she had us go back to take things out with only 45 minutes to boarding. She was rude and unprofessional. Taking off and landing was a little rough. Entertainment on the plane was limited and a little outdated."

Cons: "Flight was delayed out of St. Louis causing several of us to miss our connecting flight from Salt Lake City to Portland. Delta was of very little help in assisting us in making a connecting flight. They could have at least helped with travel arrangements and provided us with a little food, a pillow and a blanket as we waited in their terminal for the next flight on their airline which was a several hour wait. I understand these things happen but the passengers didn't cause the problem and Delta needs to take care of people better if they expect to earn repeat business."

Pros: "Overall everything was great would definitely recommend delta to others ."

Cons: "Ac not working at last 30 minutes of flight."

Pros: "Nothing"
Cons: "We lost our whole vacation and had to pay for the plans fare twice because My last name was spelled wrong on our tickets and we were unable to use them because my passport didn’t match the name on the ticket. We had to rebook everything pay almost twice as much for the plane fare, our Lodi g cost more and our trip was delayed for two weeks. Vyama is blaming us for spelling our name wrong and claimes that it’s our fault this happened because everything is automated. There saying they don’t touch anything that we enter into the booking but somehow everything they claim we entered is now in all capital letters and the space between our first name and middle name is now gone and all run together. The coustomer service number gets you to someone in India. I have tried to get this addressed four times now at first they tried to place the responsibility on the airlines now us and they have hung up on me twice. Kayak has been worthless, they also just pass the responsibility on to someone else. We will never use them again ant I intend to make sure that this mess is put out in social media to hopefully keep others from having their travel plans ruined by their flawed system."

Cons: "They changed my flight to a different one departing 2 hours earlier and did not notify me! The original flight was still available & they would not let me take it despite my reservation paper work. CRAZY! I have a two hour drive to the airport this gave me the option to leave home at 2:30am or go the night before and pay for a hotel. Flight was managed by DELTA who also did not care! All involved blamed each other. Beware"

Pros: "On time departure, actually got to Cabo early."
Cons: "The seat in front of mine had a broken reclining lock mechanism and the passenger kept trying to switch from recline to sitting up and it wouldn't latch in the upright position, so he kept jerking the seatback up and down for the entire 4 hour flight. Also the rows were so tight, and seatbacks were so close together, that the reclining seat in front of me was 6 inches from my face."

Cons: "2 hr delay"

Pros: "Staff lovely"
Cons: "Flight delayed so we got bumped to a later connecting flight An eight hour trip became a 12 hour trip"

Pros: "In flight movies"
Cons: "The flight was 3 hours late taking off which made us miss our connection to chicago so we are stuck in Atlanta tonight with unplanned expenses we were not planning on!"

Pros: "Very friendly crew"
Cons: "Seatbelts very short given ample seat size"

Pros: "Everything from the check-in to the landing was great. We were well informed about what was going on with out luggage (we were on a regional flight) and the assortment of free snacks were superb! I guess I'll be a returning customer"
Cons: "I was expecting some form of entertainment (radio, overhead monitor, etc) on the CRJ700. But it really don't take away from the experience since T-Mobile partnered with the Wi-Fi service and I received a free hour of Wi-Fi!"

Cons: "Planned my trip for my birthday/10 year anniversary. The first leg of the trip, flying from ft Lauderdale to atlanta was ok except for the pilot having to circle around bc he was too close to the airplane in front to land. This made us supposedly late to our connecting flight which by the way was not supposed to leave before 8:10. My husband and I arrived at the gate about 10 minutes before only to be told that the door was locked. Needless to say, we weren't the only ones. When we got up to the desk, the attendant was extremely rude. I was having a conversation with my husband about a dog that had just passed us . She immediately made her way into the conversation asking me what i was saying. I told her I was talking to my husband about the dog and under her breath said : " I'm sure you were." I then told her that i was more than sure about what I was talking about. We get booked on another flight and my seat was the only one without a working monitor. We asked the suitardess to see o If there was anything that could be done They tried to reset it to no avail. Since we didn't say anything else, it was forgotten about. My husband shared his screen with me so that I wasn't totally bored on the flight. Not the way I wanted to start off my birthday but I'm glad that nightmare is over Delta really needs to retrain their employees on customer service bc it leaves a lot to be desired!"

Cons: "My flight got to New York so late!!!! I missed my international flight."

Cons: "Not great communication from gate or staff on board. Failed to provide adequate water. No ice on super warm flight. Just bad experience overall."

Pros: "The turkey sabdwhich was tasty. Good movies."
Cons: "Telling me the doors were going to close & I couldn't use the restroom prior to boarding. Here I was starving from flight delays. In reality the door stayed open another 15 mins & people boarded with their to go food."

Pros: "There was a great selection of available movies"
Cons: "Again, crew was rude at the check-in counter"

Cons: "Flight was delayed an hour"

Pros: "Spacious, clean, great host and hostesses. The flight arrived at our destination 30 minutes early."
Cons: "Nothing."

Pros: "Newer plane! Comfortable"
Cons: "Nothing just great"

Cons: "Not enough water on the flight and we landed in a parking lot and shuttled back to the airport."

Cons: "Cramped, uncomfortable tin can of an airplane. Barely tolerable for even an hour’s flight."

Cons: "turbulance"

Pros: "The airport in Belize is much more managemable than most in the US."
Cons: "Slightly crowded waiting area"

Pros: "I was cleared for standby! Flight attendant at the stl gate is always friendly and willing to help! I love her!"
Cons: "I waited almost 6 hours on the phone the night before the flight to get on standby! Almost didn't get the flight! Was charged $50 only to not get on my next flight because it was over booked! Flight attendant was very rude!"

Cons: "Read previous complaint"

Pros: "Booked as Delta but flew WestJet. Crew was amazing!"
Cons: "Only minimal snacks available due to shorter flight."

Pros: "I liked that I was able to get able to get an earlier flight!"
Cons: "I don't like that I had to pay $50 extra dollars for standby on both legs of my flight! I am a very loyal delta customer and these past times flying I feel like my favorite airline is turning into the bad airlines delay everytime, problems with the plane fare prices too high! I'm starting to think about taking my business elsewhere!"

Pros: "10 minutes early departure"
Cons: "There isn't enough seats in the gate area and sitting on the runway for 10 extra minutes we could have been early"

Pros: "Easy boarding, good wifi."
Cons: "Two hour mechanical delay, seemed like they waited forever for paperwork. Then rough weather, so bouncing all over. And on top of it, no peanuts."

Pros: "On time, and direct."
Cons: "The spacing between seats has gone too far. The man in front of me caused my knees great pain when reclining."

Pros: "It was great and very roomy I felt like a movie STAR!!!"
Cons: "N.A"

Pros: "The fight was delayed but they gave us complimentary drinks on the flight. Nice."

Pros: "On time flight. Comfort seats"

Pros: "Very good service"

Cons: "Too cramped and no flight entertainment"

Pros: "Lots of leg room for a regional jet."
Cons: "AC was not very good. Very warm on flight."

Pros: "Flight left on time and landed early. Attendants were very friendly and helpful."
Cons: "Food choices were very limited for a 4 hour flight."

Pros: "Nothing"
Cons: "Aircraft, cabin crew"

Pros: "Quick boarding, departed on time, arrived early, good cabin communication"
Cons: "This is a very cramped commuter jet, just one flight attendant to serve entire plane, she came by once for drinks but not a second time"

Pros: "Efficient crew. It"
Cons: "It was good overall."

Pros: "the fact that the flight arrived on time without delay and the gates were easy to locate."
Cons: "How on earth did my i arrived lagos and only one out of my two bags showed up, i have to extend my stay in lagos and hoping my bag will come the next day, i have to pay $100 extra just to extend my one night hotel booking to two nights."

Pros: "Crew was extremely friendly."
Cons: "Temperature was way too warm."

Pros: "He was the epitome of the Friendly Skies. Chatted with whom wished to chat was quite near those that wanted to snooze on this early morning flight."

Pros: "Smooth and positive communication."

Pros: "Everything was smooth"

Pros: "Nothing"
Cons: "No meal on business, no free internet, no entertainment"

Pros: "smooth flight, good service"
Cons: "hold up to board family with 2 much luggage, overhead bins 2 small"

Pros: "Legroom was a bit tight."

Pros: "I'm always comfortable when riding UA. The staff is professional and helpful!"

Pros: "Easy"

Pros: "The service was prompt and professional. The plane on this trip was clean and in good repair. The snack was simple and tasty. It was a pleasure flying United."
Cons: "The first flight from St. Louis to Chicago was very small. While I don't have concerns about flying in a small plane, I can imagine those nervous about air travel would feel concerned with the size of the aircraft."

Pros: "Good communication and helpful."
Cons: "Delays"

Pros: "The boarding process went smoothly and was on schedule."
Cons: "Overhead compartment filled up and it was hard funding space for my bag."

Cons: "Massive delays on both flights out of O'Hare... No leg room...."

Pros: "Everything was great on the flight- we even got a snack ( stroopwafel cookie reminiscent of when I lived in Amsterdam ) and a drink. I haven't flown united in a while and was pleasantly surprised."
Cons: "Nothing but my flights were short ( under 1 hours)"

Cons: "Completely missed meeting due to 6 changes made during flight - Ask for a refund of some sort and non was given - not even air-miles or ticket recognition. Customer service from United was almost non existent. Will not be flying with united ever again."

Pros: "Good"
Cons: "Good"

Cons: "Little more time between flights would be nice"

Cons: "Luggage compartment too small even for a rolling laptop bag"

Cons: "Flight was cancelled. I am still stranded and was given no accommodations so had to pay for a hotel in addition to costing me a full day's wages in missed work. The United staff I spoke with by phone and in person were neither helpful not pleasant. I will go out of my way to never fly United again."

Pros: "Was able to get on an earlier flight"

Pros: "The crew. Short and sweet flight."
Cons: "Small seats. Bad coffee."

Pros: "noth"
Cons: "Nothing"

Pros: "Good service"
Cons: "Delay in air"

Pros: "I like the seats and the leg space .they were very comfortable ."
Cons: "No comment"

Cons: "The delay. It was approximately a 2 hour delay getting to Arcata."

Pros: "Wifi on flight"

Pros: "All the crew were friendly and accommodating."
Cons: "Waiting so long for the flight to actually take off. Very late !"

Pros: "Gate agent was great.... Have me an edit row seat. But my 90 minute flight from St Louis, led to a 40 minute wait for my bag"

Pros: "New (to me) lime sparkling soda And a cookie too! Seemed to be a little more seat and leg room."
Cons: "I only wish your branded credit card did not cost$95.00 after first year."

Pros: "we were 10 minutes early to the gate"
Cons: "super cramped quarters, like touching legs to the next person the whole squirmy flight close... the plane was made for little people."

Pros: "Price was lowest for that date and itinerary."
Cons: "Feels like United is second class compared to other carriers. I purchased this for my Morher-n-Law who rarely flies was traveling by herself. there were 7 gate changes 3 day of. I Was very concerned if she would make it."

Pros: "Rain delayed our take off but most of the time was made up. No complaints!"
Cons: "Forced to check our carry on suitcase even though there was plenty of room above the seats."

Pros: "Newer plane,"

Pros: "They got me on a flight home that night"
Cons: "I had to wait 4 hours in the St. Louis airport and 4 hours in the Dallas airport. Was a very long day!!!! I do not like to fly American Airlines and that was the only flight that was available. The plains are small and cabin pressure always hurts my ears."

Cons: "Late out of Stl. Missed flight out of Chicago"

Pros: "Flight was on time"

Cons: "I wish we would have known ahead of time that we needed our own personal devises to watch a movie. We would have been better prepared. We didn't" have long to download the Intied app and for some it just wouldn't load so they could watch a movie. I also wish there was a better selection of movie to watch."

Pros: "Departed close to on-time. And as a pilot myself any landing you walk away from is a good landing."
Cons: "Boarding nearly last there was no room in the overhead compartments. This aircraft is tiny and with my small bag on the floor my feet rested on top of my bag making it cramped."

Pros: "On time. Quick boarding, very efficient."
Cons: "Stewardess was a little grumpy."

Cons: "Delayed over an hour in STL, which caused me to miss my connection to Hartford. United rebooked me on Delta. I had to go from STL to Newark (United) then to Detroit to Hartford (Delta). I was in airports for over 14 hours. I was 7 1/2 hours late leaving compared to my original schedule and arrived at the hotel the next day. I had 5.5 hours of sleep for an interview that I traveled for in Hartfford. Thanks United."

Pros: "Arrived on time despite having to swap planes because of faulty equipment."
Cons: "Should have inspected plane sooner and should have better maintenance program."

Cons: "Flight cancelled due to mechanical, re-booked on Delta who had to re-book me on Alaska due to mechanical. An 8 hr trip turned to 22hrs."

Read more about Delta
COVID-19 information

Safety measures for airlines flying from St. Louis to Idaho Falls

Airlines flying from St. Louis to Idaho Falls have enacted additional safety measures and adjusted policies to better accommodate travelers. Policies vary by airline.

Heightened sanitation

Daily cleaning, installation of cabin HEPA filters

Mandatory masks

Masks required on board, masks provided

Social distancing seating

Middle seats unavailable to book

Pre-flight testing

Testing for antibodies, testing for symptoms

Book cheap flights from St. Louis to Idaho Falls

Recent round-trip flight deals

1/13
Wed
2 stops
Delta
12h 58m
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1/16
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Delta
9h 10m
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28h 05m
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19h 09m
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12h 58m
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28h 05m
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21h 36m
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9h 01m
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32h 15m
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