$73 Find Cheap Flights from Ontario to Houston - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Houston departing on 7/21. 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.
1 adult
1 adult, Economy, 0 bags

Save 21% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest round-trip
$178
Typical prices: $184-$333
Frontier
Wed 7/22Tue 8/4
ONT - IAH • Non-stop
Cheapest one-way
$73
Typical prices: $115-$188
Frontier
Tue 7/21
ONT - IAH • Non-stop
Top airlines
Cheapest • from $178 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
You can fly direct with Frontier, Southwest and United Airlines. Average duration is 3h 14m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top routes
Cheapest • 40% average savings
Most popular
Insights
Insights
Insights
Insights
Avoid delays
Most punctual • 93% on-time
Best time • Fewest delays
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 41% compared to booking last minute.
Insights
Insights
Insights
Insights
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Houston!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Ontario to Houston (ONT-HOU)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Houston that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Houston

Wed, Jul 22 - Tue, Aug 4
Frontier Logo
9:32 am - 2:52 pm
ONT
-
IAH
3h 20mnonstop
Frontier Logo
6:10 am - 7:32 am
IAH
-
ONT
3h 22mnonstop
$178Frontier
Thu, Aug 13 - Mon, Aug 17
Frontier Logo
9:36 am - 2:56 pm
ONT
-
IAH
3h 20mnonstop
Frontier Logo
6:10 am - 7:32 am
IAH
-
ONT
3h 22mnonstop
$180Frontier
Sat, Aug 15 - Sat, Aug 22
Frontier Logo
1:06 pm - 9:50 pm
ONT
-
IAH
6h 44m
1 stop
Frontier Logo
5:38 pm - 7:01 pm
IAH
-
ONT
3h 23mnonstop
$185Frontier
Sat, Aug 15 - Sat, Aug 22
Frontier Logo
1:06 pm - 9:50 pm
ONT
-
IAH
6h 44m
1 stop
Frontier Logo
5:38 pm - 7:01 pm
IAH
-
ONT
3h 23mnonstop
$188Frontier
Tue, Aug 25 - Wed, Aug 26
Frontier Logo
7:56 pm - 10:34 am
ONT
-
IAH
12h 38m
1 stop
Frontier Logo
5:38 pm - 7:01 pm
IAH
-
ONT
3h 23mnonstop
$189Frontier
Mon, Aug 10 - Thu, Aug 13
Frontier Logo
9:36 am - 2:56 pm
ONT
-
IAH
3h 20mnonstop
Frontier Logo
6:10 am - 7:32 am
IAH
-
ONT
3h 22mnonstop
$192Frontier
Tue, Jul 28 - Wed, Aug 5
Frontier Logo
3:40 pm - 12:22 pm
ONT
-
IAH
18h 42m
1 stop
Frontier Logo
6:10 am - 7:32 am
IAH
-
ONT
3h 22mnonstop
$193Frontier
Sat, Aug 1 - Sat, Aug 8
Frontier Logo
9:36 am - 2:56 pm
ONT
-
IAH
3h 20mnonstop
Frontier Logo
6:30 am - 11:50 pm
IAH
-
ONT
19h 20m
1 stop
$194Frontier
Tue, Aug 25 - Tue, Aug 25
Southwest Logo
12:30 pm - 5:35 pm
ONT
-
HOU
3h 05mnonstop
Southwest Logo
8:50 pm - 10:05 pm
HOU
-
ONT
3h 15mnonstop
$235Southwest
Sat, Aug 1 - Sat, Aug 8
Southwest Logo
6:30 pm - 1:10 am
ONT
-
HOU
4h 40m
1 stop
Southwest Logo
8:25 am - 9:35 am
HOU
-
ONT
3h 10mnonstop
$245Southwest
Booking Insights

KAYAK's insights & trends for Ontario to Houston flights

Get data-powered insights and trends into flights from Ontario to Houston to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Ontario to Houston?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Houston departing in July.

What is the cheapest Ontario to Houston flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest return flight from Ontario to Houston costs $157 on the route between Ontario (ONT) and Houston George Bush Intcntl Airport (IAH). Over the past month, this route was, on average, 40% cheaper than other Ontario-Houston routes. It is also the most popular route.

What’s the cheapest day of the week to fly from Ontario to Houston?

The average price of all round-trip flights from Ontario to Houston clicked on KAYAK for each day over the last 12 months.

When flying from Ontario to Houston, you should consider leaving on a Friday and avoid Sundays if you are looking for the best rates. For your return to Ontario, you’ll find the best rates on Fridays and the most expensive ones on Wednesdays.

What is the cheapest month to fly from Ontario to Houston?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Houston, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Houston is September, where tickets cost $34 (return) on average. On the other hand, the most expensive months are June and January, where the average cost of round-trip tickets is $110 and $102 respectively.

How far in advance should I book a flight from Ontario to Houston?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to Houston, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Ontario to Houston, you should book around 2 weeks before departure, which saves you about 41% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

Expert advice

Expert advice for your flight from Ontario to Houston

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
John Walton

John Walton

Expert on IAH

Independent aviation journalist John Walton took his first flight at eight weeks old and hasn’t stopped travelling since. A world-renowned expert in airlines and the passenger experience, he writes in depth on aviation, is a resident expert on travel in Japan and France, and offers a uniquely queer perspective on travelling the world.

Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Yulia Denisyuk

Yulia Denisyuk

Expert on HOU

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Good to know

Cheapest flight$73
Flight from Ontario to Houston George Bush Airport

When to book flights from Ontario to Houston

Are your dates flexible? Find out the best times to travel from Ontario to Houston based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Ontario to Houston

  • What is the cheapest flight from Ontario to Houston?

    In the last 5 days, the lowest price for a flight from Ontario to Houston was $73 for a one-way ticket and $178 for a round-trip.

  • Do I need a passport to fly between Ontario and Houston?

    Yes

  • Which airports will I be using when flying from Ontario to Houston?

    On your way to Houston, you’ll fly out from Ontario. You’ll be landing in one of Houston’s 2 airports: Houston Hobby or Houston George Bush Intcntl.

  • Which aircraft models fly most regularly from Ontario to Houston?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ontario to Houston?

    oneworld, and Star Alliance are the airline alliances operating flights between Ontario and Houston, with oneworld being the most commonly used for this route.

  • How does KAYAK find such low prices on flights from Ontario to Houston?

    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 Houston.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Houston?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Houston from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Houston?

    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 Houston with an airline and back to Ontario with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Houston?

    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 Houston from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Prefer to fly direct from Ontario to Houston?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Ontario to Houston.
Find which airlines fly direct from Ontario Airport to Houston, which days they fly and book direct flights.

Direct departures

Ontario to Houston

Monday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

Tuesday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

Wednesday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

Thursday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

Friday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

Saturday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

Sunday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

See more direct flights

Direct returns

Houston to Ontario

Monday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

Tuesday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

Wednesday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

Thursday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

Friday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

Saturday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

Sunday

Frontier,Southwest,United Airlines

Frontier,Southwest, +1 more

See more direct flights

Reviews of the top 4 airlines serving from Ontario to Houston

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Houston. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Houston? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
SouthwestOverall score based on 4250 reviews
8.1Boarding
7.5Entertainment
8.6Crew
7.0Food
8.0Comfort
Airline reviews

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

4.0 OkaySteven, Jun 2026
ONT - LAS
Read more Southwest reviews

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

One major problem that was very unprofessional and uncalled for. Plane landed and we had to wait 20 minutes to get off the plane since they were waiting for someone to come to the gate to drive the jetway. Southwest couldn't have someone available and waiting for the plane to land? Is there only one person in Hobby airport who knows to drive the jetway? Was he at lunch? In the bar? Uncomfortable and uncalled for!

Snacks are always pretzels. Why can't you also offer peanuts ?

On time. Friendly staff. Took to long to pre bord all the specialty groups. Cramped small plane

Full cans of soda would be nice. A choice between two snacks would be appreciated.

Tried watching free movie and it kept freezing so I couldn’t finish.

Service was great, boarding and exiting went smoothly, and the flight was very pleasant.

The crew and flight went well. My issue was internal communications. I had a connecting flight that initially was changed to a later time since first flight was delayed, then they changed back to original time because “the captain thought hed make it”. Upon arrival at connecting airport, the flight attendant assured that the connecting flight was still there and I should run to the gate after deplaning…well that was inaccurate. The plane had departed and gate was empty. I was stuck at airport 4 hours hungry and irritated and also had to again cancel my transportation plans at destination. After informing the help desk I was given a dry oh well and a measly $15 food voucher that barely could afford anything at that airport.

I liked receiving attention from aged and well experienced flight attendants. I disliked the non-gluten-free snack but I brought my own so I was OK.

There were over 40 people in the “preboard” group. It’s not fair for southwest to charge for an upgraded boarding fee (a1-a15) and then let over 40 people board before.

The boarding process on the departure from LA was rather slow even though I was in Group 1. For first class, I was not expecting to have to pay for Wi-fi but I did and then the wi-fi was spotty. The entree was surprisingly good and so that was a pleasant surprise. However, once I got to Houston, it was terrible. Unfortunately there was bad weather but the constant gate changes for my connecting flight was difficult to manage due to having to navigate back and forth between different terminals.

No screens or meal options. Freezing cold. Dirty seats. Left late.

Boarding was again a "free for all". We were boarding group 4, and almost the entire plane was able to board before us. It's a shame that someone who follows the rules, gets the short end of the stick. Not fair.

My flight was canceled a few hours before boarding. I was rebooked on Copa airlines and missed an important meeting .

Complimentary light meal would be appreciated. But great flight crew service on all legs

I boarded flight UA#1318 at Sacramento International Airport going back to Houston TX. The flight was scheduled at 5:10am. I was able to check in virtually using the United Airlines app. When I entered the airport, there was no one outside assisting with checked bags as it was for Delta Airlines. Immediately upon entering, there was a LONG, EXTREMELY LONG line to the kiosks to get boarding passes. I stand in line to get boarding passes then had to move to ANOTHER EXTREMELY LONG line to get my bags checked in. While standing in this line, we noticed an agent taking customers to 3 at a time to her station to check their bags in. Lucky for me, she called me back, checked my bags for me and I was on my way. I then encountered another long line at the TSA check and to avoid I ending up having to sign up for CLEAR to bypass it. So glad, I did.,...Both of my flights were great with no issues, butthe check in progress at Bush Airport was so much smoother. Check-in at SMF airport needs to be anaylzed and corrected. Do better United, I know you can....thanks

I was in first class. The outlets at my seat did not work. The plane was shabby and run down. I had prepurchsed a day subscription for internet that was not redeemable. I had to repurchase the internet for my flight and then it didn’t work anyway. Quite disappointed in what was supposed to be the launch of a great vacation.

United sent me a mileage plus number last year but that number is invalid so I can’t use it to check into flights or collect mileage. There is human to speak about the problem, only computers who keep asking me if I am using the correct email. It’s so frustrating and I cannot resolve it.

Due to one crew member not showing up to work, our flight was significantly delayed causing us to miss our connecting flight in Houston to Mississippi causing us to be delayed by more than 6 hours and missing our event all together. Very disappointing. All because ONE crew member called in sick. United did grant us a $15 meal voucher, which was a small but appreciated concession that I wasn’t able to use because I ordered my lunch and paid for it before applying the concession, and the staff said it was too late to use it. Ugh! We also had a TWO delay coming back from Mississippi, but that was on American Airlines and it was due to weather, so not their fault. Anyway, not at all impressed with United’s handling of our flight and the HUGE disappointment of missing our important family event for our 90 year old mother. All that money and all that stress and emotions for nothing. Having to wait the hour to bring an employee from LAX seemed like something that should not have happened. Why don’t you have a local back-up? Santa Ana is not a little airport in a rural area.

I got upgraded, so comfort was not an issue. But as always, it is the people from baggage handlers, flight attendants, pilots etc. that make the difference.

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

The plane was very creaky and lots of ringing. Plane was dirty and dingy. I couldn't hear the captain's announcements from the flight deck. Not sure if it was the captain or the audio equipment, but good thing there wasn't an emergency where we needed clear instructions. The overhead compartments were clearly full, but the flight crew allowed people to stand in the back with their carry on luggage. Then after everyone boarded, they had to go to the front to gate check their luggage because there was no room for their bags and then they returned to their seats...such a waste of time when clearly the overhead compartments were full when they originally boarded.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

I booked an aisle seat and was given a middle. At 6'4" 230lbs, it is not ideal to fly in the middle row for myself and passengers.

The flight was on time and arrived early. The crew were friendly and helpful.

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

VERY disappointed at the agent checking in my luggage. I know that the weight limit is 23 kg, a little over 50 pounds (50.71 pounds). Yet the agent kept repeating "50 pounds". So I said, the limit is 23 kg, and she had the audacity to say 'no, it is 22 kg!" Imagine my surprise. Was she ignorant or was she poorly trained? Not sure. The boarding process was pretty good. The speakers were loud enough so I still could hear them despite inconsiderate passengers continuing to speak while the announcements were going on. During the flight, the teenage girl sitting behind me kept pressing her feet to the back of my chair. I turned around several times, yet she did not get the hint. I did not make a fuss since I sense I had a bad streak that night with AA, so I just did the best I can to lean forward and not let that bother me.

Awful. We had an 8 hour mechanical delay- no vouchers and no kind/courtesy/professional representatives in the entire airport. Not only was it a terrible experience for both my 7 year old and myself, I still have not heard back from American about how they’re going to correct it- I’ve sent 2 or 3 emails about our experience- which was just awful. Not to mention according to national traveling laws, we should be reimbursed… but of course they’re not responding.

It was wonderful upgrading to first. Plane was so cold thou. Crew was great. Wish there was a food option in first for such a long flight. Doesnt matter the time of day. Chintzy.

The flight was delayed and we were told the airplane is on its way to the gate from the hangar. We were told this for 2 hours and the flight was continually delayed in ~30 minute increments. Then we ended up having a new airplane. The issue wasn’t clearly communicated and it left everyone feeling confused about when we would actually be leaving. Whenever they communicated a new boarding time it felt arbitrary and random. The boarding process was a mess and disorganized, which made it last longer than necessary. Landing was rough. Seats were uncomfortable.

When I wanted to check in 3 hours prior to boarding time, the employees mentioned “a little over an hour delay” so I waited for an hour then I went to go look for food in the terminal and most people from that flight were in the same area looking for food. Finally I decided after food to check to see if it’s anytime closer and now it’s 2 mins until boarding closes?! What are you kidding me? I didn’t receive anything via sms about boarding now nor via email or on the intercom. I luckily made it through, barely, and then there’s no room for my carry on mind you I’m in the very first row so I had to place my purse in one further row back and my carry on sections down. Not sure who pays for better seats to get your stuff placed all over the plane but that was the worst experience I’ve ever had flying with anyone.

The takeoff was the smoothest I've ever experienced on any airline and this is the first time I've flown on frontier so this was an extremely pleasant surprise!

A lady asked to stop the flight after the tunnel pulled away and we began to depart a flight that was already hours late. The attendance respectfully stopped the the plane and had the tunnel return. After the tunnel returned the passenger claimed to have changed her mind . The tunnel was then put in reverse and the passenger remained on the plane .. They should have sent the sick passenger off the plane like initially replaced. They existed a couple off the plane prior to that situation.. So.. all and all.. it was a long and flight.. .

We understand and comply with Frontier’s bag sizes. We’ve had some problems in past while having to await other passengers who do not understand the baggage restrictions or have not prepaid and that is usually our biggest concern (others delaying us) with flying Frontier. Flying OUT of ONT, however, has always been a great experience. I’ve also noted even on delayed Frontier flights very knowledgeable pilots who manage expectations well.

Long lines, rude staff, everything that's offered you have to pay for.

The last time I flew Frontier was in the 1960s when it was a “real” airline. We flew this time because of the price & schedule. As the saying goes, you get what you pay for.

I appreciated the upgrade to free cary-on bag and seat selection at no charge

Flight was delayed on the runway for 40 minutes the crew did not even offer even water to passengers to compensate for the flight delayed. The flight was delayed due to aircraft mechanical issues. Worst customer service ever

This isna terribly run airlines. If you're one minute late, they will deny your ticket. Don't waste your time or money

Flight was delayed for more than 3 hours, crew at ONT airport was rude, and when we got to DFW the airplane had an issue landing, we had to be taxied to the terminal, and the luggage was hold until the next day.

Everything you need to know for your flight from Ontario to Houston

Information on your arrival and departure airports