Daily cleaning, installation of cabin HEPA filters on flights from Ontario to St. Louis
|September||Best time to beat the crowds with an average 31% drop in price.|
|December||Most popular time to fly with an average 22% increase in price.|
Average price round-trip
|$334||(avg. price over the last 2 weeks)|
Good deal round-trip
Good deal one-way
The United States has restricted the entry of all foreign nationals who have passed through or have been in China, Iran, Most European Countries (Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland, Monaco, San Marino, Vatican City), the UK, Ireland and Brazil in the past 14 days.
With the exception of certain travelers which includes certain family members of US citizens or permanent residents including; spouses, children (under the age of 21), parents (provided that his/her US citizen or permanent resident child is unmarried and under the age of 21), and siblings (provided that both the sibling and the US citizen or permanent resident are unmarried and under the age of 21);
There is also an exception for travelers with the following visas: A-1, A-2, C-1, C-1/D, C-2, C-3, CR-1, CR-2, D, E-1 (as an employee of TECRO or TECO or the employee's immediate family members), G-1, G-2, G-3, G-4, IR-1, IR-4, IH-4, NATO-1 through NATO-4, or NATO-6 visa;
Members of the US Armed Forces, spouses, and children of members of the US Armed Forces;
Travelers with invitation of the USA government for a purpose related to the containment/mitigation of the Coronavirus (COVID-19);
Travelers with documents issued by the US Department of Homeland Security, US Customs and Border Protection, or US Department of State indicating that the traveler is exempt from the restriction;
B1 crew crewmembers that are engaged in lightering, Outer Continental Shelf (OCS) activity, wind farm activity, private air/sea crew and other similar crewmember activities;
Students with an F-1 or M-1 visa and their F-2 and M-2 dependents, if they arrive from or have been in Ireland, the UK or Schengen Area in the past 14 days.
Starting on January 26, all travelers (including US citizens and transit passenger) must present a negative COVID-19 viral or antigen test result issued 72 hours prior to departure or have an evidence of having contracted and recovered from COVID-19 prior to boarding the plane.
US citizens and permanent residents arriving from the UK must present a medical certificate with a negative COVID-19 PCR or antigen test result issued within 72 hours prior to departure.
Travelers returning to the US are advised to stay home as much as possible, avoid being around people and consider getting tested for COVID-19 after returning from travel and participated in higher risk activities.
All other info
Travelers are subject to COVID-19 measures set by the state/territory of their final destination. For more information go to CDC website.
There are currently 990 active cases of COVID-19 diagnosed in US and 0 deaths as of Jan 20 2021
Please see our Coronavirus (COVID-19) Travel Restrictions page for more information on restrictions worldwide.
There are no direct flights for this route listed on KAYAK, the shortest multi-flight duration is 6h 56m.
In the past 3 days, the cheapest one-way tickets were found on United Airlines ($197), and the lowest round-trip tickets have been found on Frontier ($129) and Multiple Airlines ($201).
From Ontario to St. Louis, Friday is the cheapest day to fly on average and Sunday is the most expensive. Flying from St. Louis back to Ontario , the best deals are generally found on Wednesday, with Thursday being the most expensive.
When flying out of Ontario you will be using Ontario, often referred to as Ontario Airport. You will be landing at Lambert-St Louis, also known as St. Louis Airport.
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to St. Louis.
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Ontario with another airline.
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.
Scores according to KAYAK customer reviews
Pros: "Easy, convenient and everyone is nice and accommodating. We always get to SFO under an hour"
Pros: "Crew was helpful and friendly."
Cons: "Flight got delayed and almost missed my connection."
Pros: "That the flight was earlier then Expected"
Cons: "Bag fee"
Pros: "The fact that I got fully refunded, even though I still lost out on $500+."
Cons: "My flight was supposed to leave at 12, and all that Kept happening was me receiving text messages about delays pushing my departure time back to 5:35pm. I missed a big birthday event I was throwing for my class that I teach, lost out on money spent for the event and missed out on all the memories made that night. I never got to leave, ended up cancelling my flight. What a waste of time. Seems to always happen when I fly through United."
Pros: "i was rebooked and am still on my way"
Cons: "i was delayed in ONT, making my flight an almost 24 hour trip from vONT to my destination. not fun had to reschedule car rental. luckily, they did not charge extra"
Cons: "Air Canada flight from Ontario to SFO was operated by United. Our flight was delayed by 2 hours and we ended up missing our connection. The customer service on the phone from both Air Canada and United would not take responsibility and continued to advise to call the other company to reschedule the flight. Not only did we miss our connection but our checked bag was rerouted onto another flight with no formal notification."
Pros: "Flight was ok"
Cons: "It was late"
Pros: "on time"
Pros: "Nothing to like when an agent tells you that 8 seats open on plane .but already full!"
Cons: "See above!"
Cons: "Flight was 3 1/2 hours delayed. Missed my original connection. Missed the second connection because (as the attendants told us) they were unable to get ANY flight information to inform the passengers of where their connecting flight was. They were also pretty snotty and acted like it was our fault that we might miss a flight. I'm now sitting in Houston for the final flight of the day."
Pros: "Que acomoden a las parejas juntas."
Cons: "Asiento incomodo"
Pros: "Ease of checking in by phone & printing out board passes."
Cons: "That the ride was so rough. Pilot apologized & said it was just a bad nite. It was a smaller plane so that maybe made the turbulence feel worse too."
Pros: "We got my wife on a plane home in under four hours."
Cons: "United decided to bump some of their glorified bus drivers ahead of me on standby so I had to wait a full four hours in O'Hare listening to some doichebag from LA try to entertain folks at the Goose Island bar with his stories about selling franchises."
Pros: "I liked nothing about my flights."
Cons: "I hated that my first flight was delayed a whole day and I had to fly out of a different airport to get to eugene. To add coming home I tried to upgrade my flight to Ontario to an earlier time and they refused to do so and said it would cost $75. I felt the least the airline could do was let me fly home an hour earlier since they delayed my flight a whole day but that didn't happen."
Cons: "The plane smelled like sewage and it was extremely cold inside the plane for the entire duration of the flight."
Cons: "2 hour delay"
Pros: "Upon arrival at my gate departing to Durham with a 2 year old handful. I was excited to hear the attendant call for travelers with small children to board first. The thought of boarding at the same time as everyone else was giving me anxiety."
Cons: "Once I shuffled through tons disgruntled travelers because of my "child privilege" the attendant rolled her eyes and took a deep breath at the amount of time it took me to get to my ticket. Mind you, it makes sense I would have it somewhere convenient, but like I said single traveller, 2 year old handful. She scanned my ticket and flogged her hair in the air telling me take my stuff to the front of the plane. While the other attendant tagged all my items."
Pros: "It was fast & we didn't die we're the only good things"
Cons: "The Flight attendant was rude and mean , the plane was small and old .. But most of all he flight attendant ruined the flight for everyone. I even heard people saying she was mean as they were getting off the flight. I think her career as a flight attendant has ran its course (she was pretty old also)"
Pros: "Nice crew"
Cons: "Long wait for the flight delay, Long wait for take off, long wait pulling into gate. No outlet for rechargING phone, same on flight."
Pros: "Great staff."
Cons: "A crying baby that say behind me."
Cons: "The snacks are too small."
Pros: "It was on time And very convenient"
Cons: "Some other carriers offer wifi inflight service free of charge. I tried connecting to wifi in flight with no success several times."
Pros: "newer plane. more personal space per seat"
Pros: "Leg room in seats better than on some airlines. Staff friendly."
Cons: "Both flights were delayed. One hour going and two hours on return."
Cons: "Our flight got canceled due to airport issues at our destination. United canceled the flight but had no alternative flights to get us home. Flights the next day were full. Took over an hour with the service desk to reroute tickets to cancel them and to get bags back then took two hours at baggage claim to get the bags back. Customer service was basically useless. After all that, we didn't get any of our money back! I will be avoiding United airlines. Flight cancelation was not their fault but the way they handled the rest of it was embarrassing."
Pros: "We were not given seats together..."
Cons: "Busy and not well managed and we bought seats well in advance"
Pros: "The amenities are fabulous. The flight was very comfortable."
Pros: "Same as above. Did notice the woman staffing the counter at boarding having extreme patience with people's problems and non problems. She was great and deserves a raise. Denver gate B 85 between 1:00 and 3:00 6/15/16."
Pros: "I liked that they waited for me because my flight was late getting in to San Francisco."
Cons: "Received several text messages announcing further delays in flight..."
Cons: "Ticket agents did not communicate with passengers on why there was a delay and weren't willing to help passengers find alternate routes to their destination."
Cons: "lost our bag, crying babies, uncomfortable plane"
Pros: "The flight was very pleasurable. Smooth takeoff."
Pros: "I was comfortable and I didn't die."
Pros: "Had to wait standby but got on the flight. Was very happy about that!!"
Pros: "Nothing. I am stranded in an airport. Delayed nearly 14 hours. American airlines fixed the issue since united could not. Never again."
Cons: "Everything. I am stranded in an airport. My original flight was at 10:05pm. My new flight is at 11:45am. American airlines stepped up and helped me get a flight out earlier. I am now on a one stop flight instead of non stop, even though I paid for direct. Not very happy and will not use untied again."
Cons: "First my flight was cancelled. Then when they finally gave me a flight to San Francisco for my connecting flight they said that flight to seattle was delayed. Delayed to me is up to an hour. I waited for 3 hours past my scheduled take off time until my flight fonnaly took off. I have flown a lot in my life and this was by far the worst experience I've ever had on an airplane."
Cons: "Cramped space."
Cons: "It never took off! They did not reschedule, they were not attentive, it was absolutely terrible."
Cons: "Delayed 2 hours because they had to change tires they didn't decide that until everyone was already on the plane then had to deboard counter people were very rude this airline is always delayed for something probably the worst airline ever"
Pros: "Crew is very polite and helpful. Boarding was quick and painless. Overall very pleased with experience."
Pros: "All the flight attn. were great. The biggest problem on this flight was the small seats, head room, and overhead area for our carry ons. Other than that, plane was great."
Cons: "Seats too small, and overhead storage very lmt. other than that all is fine."
Pros: "The actual flying was fine"
Cons: "The delays over and over again , 1/2 hour at a time for 5 hours"
Pros: "Flight itself wasn't bad but huge delay and almost cancellation"
Pros: "Our flight attendant was great! She was accomodating, funny,and nice."
Pros: "The flight attendants were great."
Cons: "Late flight due to technical issues and a passenger problem. Wish both could have been resolved quicker."
Pros: "Was a short flight"
Cons: "The plane was soo small. There wasn't enough room."
Cons: "Delay in takeoff and the crew were tired and irritable"
Cons: "Flight time was changed, and I wasn't notified, so I missed the flight."
Cons: "Disorganization with boarding process. Gate changes from that which was indicated on boarding pass, without notification. Expensive baggage/fees. No basic complimentary accommodations (snacks). Uncomfortable seats lacking ergonomic design and headrest. Small spaces for personal items."
Pros: "Crew was great! Got to St. Louis on time."
Cons: "The tickets look like a deal until they charge for every other thing. The information regarding what bag can be carried on without a fee is very confusing. We paid and then saw people rolling cases and putting them in the overhead bin. The seat prices are ridiculous so you don't want to pay for a seat they will assign you for free, I was then told I had to go to the gate to get a seat assignment even though I had already purchased a ticket. I waited for almost an hour before someone showed up. I was told the only seats left were the exit rows. Luckily I am healthy. If I have paid for a ticket Frontier should guarantee me a seat. We had to wait in line even though we had already paid for our bags and some of us went on line and checked in and had boarding passes. Where is the short cut then?? It was so convoluted we will never fly Frontier again. Too much work, let me pay for the ticket and let me have a bag and give me a seat for crying out loud. The flight crew was great. Very nice."
Pros: "the crew was very entertaining which always helps make the trip more pleasant."
Cons: "Too bumping of a flight. Not sure there was anything that could be done about that but I'm guessing a higher altitude may of helped but i am not a expert, just a nervous flier."
Pros: "Quick flight"
Cons: "All good"
Cons: "The seats and the trays are too small there's no space it's horrible and also Landing was horrible I thought I was going to die"
Pros: "Breckinridge whiskey"
Cons: "Bit cramped"
Cons: "seats are worn out, you have to pay to place a bag in overhead compartments"
Cons: "Unexpected 45$ per carry on. Horseshit"
Pros: "Was on time as scheduled - unlike the 3 previous flights I expirenced with Frontier"
Cons: "Not a happy crew. Extra charge for everything! Plane dirty- I wonder when last time cleaned?"
Cons: "Same as above"
Cons: "The flight was 2 hours delayed, uncomfortable, the loudspeaker was TOO loud, and nothing was free. The only good thing was the price...which isn't always enough."
Cons: "My luggage was lost."
Pros: "Arrived to out destination early"
Cons: "Not sitting with my mate unless I pay extra for side by side pictures."
Pros: "The price was outstanding"
Cons: "No drinks or snacks offered except if you paid. The seats are very uncomfortable."
Pros: "Pilot was nice and apologetic for maintenance issue"
Cons: "I don't understand why they had us load the plane EARLY only to wait over an hour before take off. I fell asleep. While waiting only tone rudely awaken by a stewardess telling me my feet had to be on the ground for take off ( of which did not happen until 30 min passed). They also did NOTHING to try to make up for the fact that we were stuck on the plane for over an hour."
Pros: "Lights were off for late night flight"
Cons: "Seats were really uncomfortable"
Pros: "It was cheap. also on time both ways"
Cons: "Uncomfortable seats don't recline, no space hard seats, no elbow room"
Pros: "Nice staff and crew."
Cons: "Same as above."
Pros: "Again, flight was good."
Cons: "At Denver, almost missed my flight since the gate I was supposed to board changed. And one more thing, it has been 10 years since my last flight and the hard plastic seats are something else. Since I paid for the seat, i might as well sat on the wing, would have been just as comfortable."
Pros: "Nothing cause I never went."
Cons: "The whole trip because of the booking through the internet. Just cause of the dates was wrong that I want to change was a disaster on my part and the booking party was impossible for me. It is sad that 3 minutes after I booked it destroyed my trip that I wanted to go."
Cons: "They gave our captain to an Atlanta flight. We had to wait for another captain to get to DIA. Then we got loaded up and had to wait for the east gate to open, then they had to map out another plan I.e., the northeast gate (and that didn't materialize) soooo we sat on the plane until we receive the okay to depart on "the east gate". Which was approximately 21:30. We finally arrived at approximately 01:00 a little more than hour late. It took better than 30 minutes for us to get our luggage. Stupid crazy that a person is paying ridiculous prices for pitiful customer service."
Pros: "The landing was good."
Cons: "$40 for a carry on? Come on now. $5 seat upcharge because "window seat"? Chairs that don't recline? You interrupt my already terrible nap so you can try to sell the entire plane your "no-black-outs" Mastercard. The cabin was much too hot, people complained and nothing was done -- adding insult to injury, water costs money. Every aspect of buying a ticket is littered with popups to upsell you to something "better" or more "exclusive". The entire experience from buying a ticket to touch-down was dehumanizing and an insult my intelligence."
Cons: "Boarding was delayed by 35min and no reason was given. Bags were took 35min to arrive at baggage claim."
Pros: "On time. Easy boarding."
Cons: "No snack not even water!"
Cons: "No wifi or mobile message view."
Pros: "Time enough to have a real meal."
Cons: "Spending 5 plus hours at an airport waiting for another flight."
Cons: "I was charged $40 for a carry on that I didn't even have."
Pros: "Price, timeliness, condition of the plane."
Cons: "The whole "buy your seat" and "buy your luggage a place on the plane" remains annoying. Similarly, the website gets confusing as you click through all the upsell options."
Cons: "The plane was delayed an hour and a half because of a computer problem."
Pros: "I really did not feel any more crowded or uncomfortable than any other airplane Ive been on. I sort of like that the tray tables are the size of a large cell phone- less bulky than regular tray tables."
Cons: "The crew wasn't bad, just seemed unhappy to be there. There was some confusion with which gate we should be at, changed us three times before settling on the original gate. Boarding was no problem but then we waited without taking off for over 45 minutes. The pilot came over the intercom and informed us that he had no idea why we were delayed to take off, but that he would "find shortcuts" to get us there on time. The biggest gripe that we have is once we landed and went to baggage, several of us waited for golf clubs for close to an hour before a worker realized "they forgot" to turn on the button to allow oversized items to come out. Then she said "sorry I was busy with ticketing and Frontier doesn't have a baggage attendant". I just dont think the extra savings was quite worth the frustration."
Pros: "Updates and communication were helpful. Great prices as well."
Cons: "No free food or drinks. Too many extra fees like for bags and seat selections."
Pros: "The TSA line seemed miles long, but it went fairly quickly."
Cons: "The flight was more than 3 hours delayed which I didn't find out about until after I was at the airport. We got a $10.00 food voucher after we had been in the airport 1 1/2 hours prior to takeoff and then another 2 hours after the time the plane was actually supposed to have left. I was also told that we would be compensated for the delay, I haven't seen anything about that. My mother and I checked in together, they put me in zone one and her in zone 4, this was after I paid for each bag and $40.00 for the carry on bag. It was absolutely NOT a good experience."
Cons: "Boarded an hour late, for a flight that was already getting in at 11PM."
Pros: "I liked the price"
Cons: "My flight was late and I sat by two very ill mannered people. I know frontier is all about price, but I feel that by not providing hardly any niceties and having a small presence of staff among guests, passengers tend to behave badly on frontier flights. Everytime i fly frontier i swear I will never book with them again, bit i always because the price is so much cheaper."
Cons: "All the extra costs. Once I make a reservation I shouldn't have to pay extra for a seat assignment especially if the plane is not full. Then you take pillows and blankets out so you can't get comfortable. I would much rather pay an all enclusive price and not have to pay extra for everything."
Pros: "Crew was friendly. Plane was clean."
Cons: "When booking and checking in, no opportunity to enter Known Traveler ID number, so did not get TSA precheck. No information when booking about additional charges - $30 for a carry-on bag?? additional fees almost doubled the price of the ticket. On the flight, the volume of pilot announcements were very loud, crew said it was a new plane and the volume wasn't adjusted yet. I have never been on a flight where I had to pay for water! I have since learned Frontier doesn't allow TSA precheck - will never fly this airline again for that reason."
Pros: "on time departure and arrival. great price."
Cons: "After landing in denver for what was supposed to be a short layover, found out flight was delayed for over 5 hours because crew were out of hours and they had to get a different crew there, landed in St Louis at 2 am to find reserved rental car kiosk was closed and they left everyone's luggage in Denver. Since they only have one flight a day to st louis, is going to take over 24 hours for my luggage to arrive. Frontier help desk said it happens all the time when there is a long layover in Denver. Apparently they know it's a problem and not a big deal to them. I'll never fly frontier again. With a 50 dollar cab fee that I should have never had to take and cost of clothing and toiletries I had to purchase due to bags being left in Denver it's well over cost for a better airline. It's not like they didn't have plenty of time to transfer luggage. Not to mention the two hours of sleep I was able to take before meeting one of our vendors the next morning with clothing I'd been wearing for 24 hours and completely unprepared with laptop and other tools lost somewhere in Denver frontier luggage carts."
Cons: "Paid for a seat but unfortunately only had about 3/4 of the seat available because of the size of the person next to me. Asked the attendant to let me sit in one of the Exit Row seats that were ALL available as no on wanted to pay the $50 upgrade charge. I made this request AFTER the seatbelt light was off to not be disruptive. The attendant finally came by and offer a free drink for my inconvenience which I obviously refused as that would not help the fact that I was having to either sit sideways or lean all the way forward for a 3.5 hour flight. I explained I was not looking for a free upgrade, just to be able to get what I paid for. I do not blame there person that was sitting next to me, but the crew for not making arrangements when the customer boarded the plane. Anyone could clearly see there would be an issue with this person in a full row. Instead they ignored it and expect someone else to pay for an upgrade to solve the problem. That was my first Frontier flight and will be my last."
Cons: "There were two check in lines, one regular and one bag drop only. The bag drop line was three times longer than the regular check in line, and had one attendee working the line versus three attendees in the regular check in line. It was incompetence at a whole different level. Bag drop should be just that... You've already checked in, take the bag and let me go... It just made no sense..."
Pros: "Crew was very nice and the boarding process was good."
Cons: "Super tight and uncomfortable seating."
Cons: "Missed my flight played for insurance and didn't want to help at all."
Cons: "It was so hot for 3 whole hrs I literally nearly passed out. Everyone on the plane said something and the crew never altered the temp. They brought one round of water near the end of the flight. Rediculous."
Cons: "Unable to board flight. Arrived 1 hour early.very rude agent she refused to get a supervisor.told us there was no superb.Daughter missed chemo treatment. We were told could not get on flight till Wed.This was our first time on Frontier.It was very stressful and frustrating.checked in on line rating1.0 very very poor."
Pros: "The price and the travel times."
Cons: "Got delay notice for the first delay only after getting to the airport to meet the time restraints for baggage check. Not much good that notice did me. Only notice about the second delay was from you, Kayak, never got any notice from Frontier"
Pros: "The price was great. The flight was excellent. Crew was very nice and professional."
Cons: "The seats were hard and uncomfortable. I'm glad I was on a short flight."
Pros: "crew seemed efficient and professional. we left on time."
Cons: "generally dismal. no smiles i miss southwest! o well the journey was safe and on time and the price was great."
Airlines flying from Ontario to St. Louis have enacted additional safety measures and adjusted policies to better accommodate travelers. Policies vary by airline.
Daily cleaning, installation of cabin HEPA filters on flights from Ontario to St. Louis
Masks required on board, masks provided on flights from Ontario to St. Louis
Social distancing seating
Middle seats unavailable to book on flights from Ontario to St. Louis
Testing for antibodies, testing for symptoms for flights from Ontario to St. Louis
Waiving of change fees. Search flexible flights from Ontario to St. Louis