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Find cheap flights from Ontario to the United States from $37

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 the United States departing on 7/7. 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
0 bags
Sat 5/18
Sat 5/25

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Best United States Flight Deals

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

New York
Newark2 stops$261
Los Angeles
Los Angeles1 stop$97
Las Vegas
Las Vegasnonstop$38
Miami
Miami2 stops$146
San Francisco
San Franciscononstop$38
Chicago
Chicago1 stop$87
Boston
Boston1 stop$276
Denver
Denvernonstop$48
Seattle
Seattlenonstop$66
Fort Lauderdale
Fort Lauderdale2 stops$202
Atlanta
Atlanta1 stop$112
Dallas
Dallasnonstop$91
Tampa
Tampa1 stop$130
Houston
Houstonnonstop$70
Honolulu
Honolulu1 stop$258
San Diego
San Diego1 stop$344
Philadelphia
Philadelphia1 stop$114

Good to know

Low season

January

High season

July

Cheapest flight

$37
Best time to beat the crowds with an average 13% drop in price.
Most popular time to fly with an average 8% increase in price.
Flight from Ontario to Las Vegas

FAQs - booking United States flights

  • How does KAYAK find such low prices on flights from Ontario to the United States?

    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 the United States.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to the United States 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 the United States?

    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 the United States 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 the United States?

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

See more FAQs

Top tips for finding cheap flights to the United States

  • Looking for a cheap flight? 25% of our users found tickets from Ontario to the following destinations at these prices or less: Denver $95 one-way - $138 round-trip; Dallas $134 one-way - $259 round-trip; Las Vegas $39 one-way - $68 round-trip
  • Morning departure is around 8% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

Top 5 airlines serving from Ontario to the United States

 
Need help choosing which airline to fly with from Ontario to the United States? 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.
8.1
Alaska AirlinesOverall score based on 9106 reviews
7.3food
8.2boarding
8.6crew
7.3entertainment
7.9comfort
Airline reviews

I was not given a seat when I bought the ticket. I know airlines are trying to squeeze every penny out ot the customer, but we are buying a seat on the airplane, right? I find this irritating with all airlines, but especially Alaska because I fly it so often. No sense of customer use and loyalty.

6.0 GoodMary, Apr 2024LAX - PDX
Read more about Alaska Airlines reviews

I was not given a seat when I bought the ticket. I know airlines are trying to squeeze every penny out ot the customer, but we are buying a seat on the airplane, right? I find this irritating with all airlines, but especially Alaska because I fly it so often. No sense of customer use and loyalty.

WiFi connection bad. Food is really awful. Crew very nice and efficient

It was the worst experience because they delayed the flight by 2 and half hours. We were supposed to depart by 3:41 but they did the depart by 6 pm. It was so boring!!

The flight was diverted and departed from San Jose instead of San Francisco. This could’ve been executed more smoothly because after arriving in San Jose it seemed like nothing was being processed correctly as needed for the gate agents to do their jobs well and the flight to leave on time

I’m a first time mom and traveled with my 18mo old boy and it was not a great experience with the flight attendants. They were not friendly or helpful at all. It’s hard enough traveling with a toddler and have people be rude and unkind does not help.

It was adequate nothing special no entertain because flight was short. Crew pleasant.

Good! Although I wish I didn’t have to check my bag at the gate, when I got on the plane there was plenty of room for the bag.

My experience with Alaska Airlines flights is dominated by the fact that today’s economy class is barely humane. Everyone is so tightly packed together that one cannot move an inch for the entire flight…. and if it’s a bicoastal trip, that’s almost five hours of discomfort!! And if you’re above average in height and/or weight it’s absolute hell! Moreover, still all Economy classes are basically the same across airline carriers, it doesn’t matter who you fly with.

The cabin stewart took care of my garment bag and then made sure I did not forget it on my way out. The stewardess gave me water after I missed the earlier service (I was asleep). I received good service overall.

Excellent service and prices. I was not award of inflight entertainment.

I didn’t not like that I could not select my seat and ended up with the worse seat.

The landing was bad and the hostess came two times and i was sleeping but when she served the person that nexts to me I woke up and she didn’t even asked me if I need any drink or snacks two times!!!!

Plane was late because of a mechanical malfunction and the food listed as available was not. Flight attendants seem over worked and under paid. They just done seem happy. And that can be seen in their faces.

Waited 3 hours on a plane to de-ice due to manpower issues. Waited another hour and a half once we landed because of a gate issue. Missed my connections. Created. A total of 13 hours of delay.

Great, on time departure, friendly and accommodating crew, great leg room, Smith flight

Plane was turned around due to fog half way into the flight, Delta did not properly direct passengers to stay on same flight and instead failed to properly rebook on Alaska

Like most domestic flights in the US, you are basically on your own with this airline when it comes to food, so be sure to purchase meals and drinks ahead of time or expect to arrive starving and dehydrated (like I was).

You need to be a hacker to get the (Free) WiFi

I guess they don’t serve drinks on planes anymore

The flight was overbooked and the staff at the gate started calling for volunteers to drop out and offering incentives. That delayed the flight

Crew was great and did their best to make us comfortable and captain came out at the beginning to announce why the flight was delayed, weather situation up ahead, and kept us updated throughout the flight.

United WiFi is consistently unusable (it can take 10 mins to load a single web page). If you need Wifi to do work, be prepared to lose half a day of productivity.

Awful. I got stuck next to a person carrying a dog and behind someone with a dog. People need to board these dogs downstairs. The cabin is crowded enough with your pets

Packed in like sardines, very uncomfortable. Sitting the aisle my shoulder was rammed into numerous times by rushing flight attendants. Also flight was very cold.

the head jack on my seat didn't work and the power outlet didn't work for my seat

Left 2 hours later for delayed I had to take care a kid with special need since people don’t want to move to accommodate the rest of the family. . It wasn’t bad but that made me upset that people can be that selfish.

For a 22 minute flight all you expect is for it to be safe and comfortable

Flight was on time. Staff were friendly. I paid for Economy Plus but was required to check my standard carry-on luggage due to lack of space on the aircraft. This cost me 30 minutes, unexpectedly, in waiting at the baggage claim. This experience did not meet my expectations.

Wouldn’t let me check in said couldn’t find a ticket had to wait very long Time

Airline did not explain reasons why flight was delayed two hours. Explanations were badly needed and rarely provided. Problem seemed to clearly be the airline’s fault and not the fault of the weather or airport.

Crew were attentive and friendly. Flight was smooth and early! I enjoyed the less crowded plane. Thank you!

We are gluten free, there were not any available complimentary gluten free options.

No meal on a cross country flight? SFO-MiA is pretty much the definition of a coast to coast flight. No meal provided. Sky high wi-fi rates too. Stop nickel and diming your customers.

The staff was unprofessional and didn’t communicate very well. The boarding process was very disheveled, potentially due to a power outage the previous day but there was no contingency plan to properly get passengers boarded the following day. Once boarded the aircraft stayed on the tarmac for over 45 minutes due to high winds. The communication was sporadic but an announcement was finally made an additional 30 minutes later that the flight was cancelled but we couldn’t get off the plane. Prior to deplaning one of the gate agents came on the plane and made an announcement for everyone to pickup their checked bags and take a card to rebook a new reservation because they didn’t have adequate staff. Flights were missed, passengers went to different airports and there was little to no assistance from AA.

Apart from the delay due to unforeseen circumstances. The leg from sjc to dfw was fine. It was the leg from dfw to orf that we encountered issues mainly due to the flight attendant crew not being friendly. We had two small children and we needed some assistance to warm up milk so the baby would sleep. The crew just didn’t get it and made things very difficult. One made a remark that the baby’s dirty diaper smell was a “gift” to the plane in a rude way. Normally I’d brush that off as a funny comment if the rest of the trip the attendants were helpful or understanding of the difficulty we faced. But that wasn’t the case. We were met with rudeness on the second leg. Whereas on the first leg the crew were so nice and helpful.

Flight From PHX to CVG was on time, very professional staff

Flight was delayed and missed connecting flight. Did not give warning about delay until we showed up at the airport. Not good.

The usual wait at Columbus once you land to get to an open gate (20 minutes) and then the usual 30 minutes for your luggage to appear.

Nothing, flight was supposed to leave at 758 am. My flight didn’t leave until 430 pm. Spent the whole day at the airport.

Everything was very good EXCEPT the food, on a five and a half hour trip. They only gave to us was snacks in first class. They didn't give us pillows or blankets.

Not have to pay for every single item to take a flight. Seating and delays sucked.

Flight was cancelled and I had to spend the night in the airport lugging my suitcase around

If you don’t check in 24 hours in advance, they will charge you $110 to check your bag instead of the $30. I did not get an email with this information and did not check in. In addition, my flight home was cancelled at layover and I had to spend the night in the airport, and then have another layover at another airport before making it home. Will not fly frontier again.

Terrible. Seats are bad and the baggage policy is inconsistent

Flight delayed 3 times, resulting in late arrival, rental car place gave car away resulting in increased BS charges because I was late. Frontier blows.

I paid for extra leg room. The flimsy plastic seat underneath the floatation seat did not line up with the arm rests. It seemed as if the plastic part was zip tied on but immovable. This caused severe uncomfortable for the duration of the flight.

Left Denver late, then sat on tarmac 30 min after arrival

Better than I expected but I did pay for a seat and carry on bags ahead of time.

Crew members are very rude and not cooperate with passengers.

30 minute delay due to boarding and settling of a family.

Book cheap flights from Ontario to the United States

Recent round-trip flight deals

5/1Wed
nonstopFrontier
1h 09mONT-LAS
5/8Wed
nonstopFrontier
1h 03mLAS-ONT
$38
5/4Sat
nonstopFrontier
1h 28mONT-SFO
5/7Tue
nonstopFrontier
1h 29mSFO-ONT
$38
5/21Tue
nonstopUnited Airlines
1h 28mONT-SFO
5/21Tue
nonstopUnited Airlines
1h 34mSFO-ONT
$159
5/8Wed
nonstopAlaska Airlines
2h 45mONT-SEA
5/11Sat
nonstopAlaska Airlines
2h 33mSEA-ONT
$177
6/4Tue
1 stopDelta
4h 56mONT-DEN
6/8Sat
1 stopDelta
6h 21mDEN-ONT
$187
5/31Fri
1 stopAmerican Airlines
6h 13mONT-LAS
6/3Mon
1 stopAmerican Airlines
3h 54mLAS-ONT
$193
5/16Thu
nonstopAlaska Airlines
2h 45mONT-SEA
5/16Thu
nonstopAlaska Airlines
2h 32mSEA-ONT
$211
5/4Sat
1 stopUnited Airlines
8h 34mONT-HNL
5/13Mon
1 stopUnited Airlines
7h 31mHNL-ONT
$258
5/24Fri
2 stopsDelta
12h 42mONT-ORD
5/28Tue
1 stopDelta
6h 13mORD-ONT
$271
5/4Sat
1 stopAmerican Airlines
7h 04mONT-JFK
5/7Tue
1 stopAmerican Airlines
10h 29mJFK-ONT
$274

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Recent one-way flight deals

7/7Sun
nonstopFrontier
1h 13mONT-LAS
$37
5/18Sat
nonstopFrontier
2h 53mONT-SEA
$37
5/25Sat
1 stopDelta
4h 56mONT-DEN
$88
8/14Wed
1 stopAmerican Airlines
6h 14mONT-LAS
$93
5/8Wed
1 stopAlaska Airlines
4h 41mONT-SEA
$98
5/14Tue
1 stopAmerican Airlines
4h 20mONT-DEN
$104
5/7Tue
2 stopsDelta
13h 09mONT-DFW
$104
5/26Sun
1 stopUnited Airlines
4h 45mONT-SEA
$114
8/20Tue
nonstopUnited Airlines
1h 33mONT-SFO
$127
5/13Mon
1 stopAlaska Airlines
9h 00mONT-JFK
$143

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Last minute flights from Ontario to the United States

Last minute flight, train and bus deals

4/19Fri
nonstopFrontier
1h 14mONT-LAS
4/20Sat
nonstopFrontier
1h 07mLAS-ONT
$78
4/23Tue
nonstopFrontier
1h 27mONT-SFO
4/24Wed
nonstopFrontier
1h 29mSFO-ONT
$78
4/22Mon
multi-stopAmerican Airlines
7h 44mONT-LGA
4/27Sat
multi-stopAmerican Airlines
10h 17mLGA-ONT
$273
4/22Mon
multi-stopAmerican Airlines
8h 10mONT-JFK
4/27Sat
multi-stopAmerican Airlines
8h 52mJFK-ONT
$273
4/23Tue
multi-stopDelta
7h 08mONT-LGA
4/27Sat
multi-stopDelta
7h 46mLGA-ONT
$276
4/23Tue
multi-stopDelta
7h 35mONT-JFK
4/27Sat
multi-stopDelta
8h 22mJFK-ONT
$276
4/23Tue
multi-stopUnited Airlines
11h 06mONT-HNL
4/30Tue
multi-stopUnited Airlines
8h 32mHNL-ONT
$330
4/23Tue
multi-stopUnited Airlines
9h 00mONT-HNL
4/27Sat
multi-stopUnited Airlines
8h 32mHNL-ONT
$333
4/23Tue
multi-stopAlaska Airlines
18h 17mONT-HNL
4/24Wed
multi-stopAlaska Airlines
11h 28mHNL-ONT
$344
4/23Tue
multi-stopAlaska Airlines
16h 07mONT-HNL
4/30Tue
multi-stopAlaska Airlines
26h 29mHNL-ONT
$353

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Ontario - United States Flights

Departure:

Ontario (ONT)United States

Return flight deals:

United States - Ontario

Cabin classes:

$362
$153
$296
$39

Browse destinations:

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