HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$90+ Cheap flights from Boise to Ontario (BOI - ONT)

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 9/29. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ONT
Oct 10 — Oct 171
Fri 10/10
Fri 10/17
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Boise to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Boise Air Term. Gowen Fld to Ontario are usually found in August or October, booked 36 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from Boise to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Boise (BOI) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 10, 2025.

Round-trip from

$183
(Delta)

One-way from

$90
(Kiwi.com)

Popular in

November

Cheapest in

August

Average price

$303
From Boise Air Term. Gowen Fld to Ontario
Search Deals
One-way flight from Boise Air Term. Gowen Fld to Ontario
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($12 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Boise to Ontario

Cheapest flights from Boise to Ontario
Explore the most affordable flight options available from Boise to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 10, 2025.

This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/75:25 amBOI - ONT
1 stop6h 43mDelta
Sat 10/111:15 pmONT - BOI
1 stop4h 52mDelta
Deal found 9/9$183
This Southwest deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1611:35 amBOI - ONT
1 stop3h 55mSouthwest
Sat 10/184:55 pmONT - BOI
1 stop5h 10mSouthwest
Deal found 9/10$185
This Delta deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/284:46 pmBOI - ONT
1 stop6h 55mDelta
Thu 10/307:35 amONT - BOI
1 stop7h 31mDelta
Deal found 9/10$194
This Booking.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2312:28 pmBOI - ONT
1 stop12h 22mFrontier
Wed 10/296:53 amONT - BOI
1 stop27h 55mFrontier
Deal found 9/8$195
This Delta deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/25:43 pmBOI - ONT
1 stop6h 59mDelta
Tue 10/74:35 pmONT - BOI
1 stop6h 24mDelta
Deal found 9/10$202
This United Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/37:05 pmBOI - ONT
1 stop4h 47mUnited Airlines
Tue 10/71:15 pmONT - BOI
1 stop7h 09mUnited Airlines
Deal found 9/10$216
This Delta deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/75:55 pmBOI - ONT
1 stop6h 44mDelta
Tue 10/147:35 amONT - BOI
1 stop7h 31mDelta
Deal found 9/8$217
This Booking.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2112:22 pmBOI - ONT
1 stop20h 31mFrontier
Sat 9/278:59 pmONT - BOI
1 stop13h 38mFrontier
Deal found 9/8$222
This Booking.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/212:33 pmBOI - ONT
1 stop23h 37mFrontier
Sat 11/812:05 pmONT - BOI
1 stop22h 43mFrontier
Deal found 9/10$224
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/245:55 pmBOI - ONT
1 stop6h 44mDelta
Mon 10/275:50 pmONT - BOI
1 stop5h 18mDelta
Deal found 9/9$227
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1612:28 pmBOI - ONT
1 stop12h 22mFrontier
Sat 10/181:37 pmONT - BOI
2 stops21h 06mFrontier
Deal found 9/10$230

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boise to Ontario 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 2,558,603 searches. Data last updated September 10, 2025.
Use the filters below to find and compare flights from Boise to Ontario that are best for you.

Fly from

Boise

Fly to

Ontario

Route

Depart

Return

Price

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Wed 2/18

1:10 pm-4:19 pm

1 stop4h 09m

Ontario

Sat 2/21

6:00 am-12:18 pm

1 stop5h 18m

$183

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 10/7

5:25 am-11:08 am

1 stop6h 43m

Ontario

Sat 10/11

1:15 pm-7:07 pm

1 stop4h 52m

$183

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 2/24

4:30 pm-5:42 pm

Nonstop2h 12m

Ontario

Tue 3/3

6:22 pm-9:39 pm

Nonstop2h 17m

$197

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Wed 10/8

5:25 am-11:08 am

1 stop6h 43m

Ontario

Sat 10/11

5:50 pm-12:08 am

1 stop5h 18m

$202

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Fri 10/3

7:05 pm-10:52 pm

1 stop4h 47m

Ontario

Tue 10/7

1:15 pm-9:24 pm

1 stop7h 09m

$216

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 1/10

4:30 pm-5:42 pm

Nonstop2h 12m

Ontario

Sun 1/18

6:22 pm-9:39 pm

Nonstop2h 17m

$217

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Thu 10/2

5:43 pm-11:42 pm

1 stop6h 59m

Ontario

Tue 10/7

5:50 pm-12:08 am

1 stop5h 18m

$226

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Thu 10/2

5:43 pm-11:42 pm

1 stop6h 59m

Ontario

Wed 10/8

4:35 pm-11:59 pm

1 stop6h 24m

$235

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Wed 10/8

6:30 am-12:37 pm

1 stop7h 07m

Ontario

Sat 10/11

5:45 pm-11:57 pm

1 stop5h 12m

$236

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 11/8

8:55 am-12:16 pm

1 stop4h 21m

Ontario

Sun 11/16

6:45 am-1:09 pm

1 stop5h 24m

$236

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 21 results
1
2
3

Best time to book a flight from Boise to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Boise with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Boise to Ontario

How far ahead should I book a flight from Boise to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from Boise to Ontario. Price data was last updated on August 29, 2025.

The best time to book flights from Boise to Ontario is 36 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Boise to Ontario?

Currently, August is the cheapest month in which you can book a flight from Boise to Ontario (average of $246). Flying from Boise to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from BOI to ONT?

Find hourly flight availability from Boise to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 10, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 17% on flights from Boise to Ontario by exploring options for tickets in the afternoon.

What is the cheapest day to fly from Boise to Ontario?

Use this chart to determine the cheapest time to fly round-trip from Boise to Ontario. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Boise to Ontario flight should consider departing on Tuesday evenings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated September 10, 2025.
See what other customers who have flown with Alaska Airlines, Southwest, and Delta from Boise to Ontario have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,249 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Delta
8.0
Very good
7,963 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
8,937 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.0

Food

7.1

Boarding

8.1

Crew

8.5

Overall

8.0

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

Find useful and relevant information for your journey from Boise to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Boise to Ontario?

    A quick flight from Boise to Ontario can take about 2h 12m. Delta provides one of the quickest options available for as low as $197. Boise and Ontario are separated by a distance of 661 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Boise to Ontario round-trip?

    According to our current data, Delta ($156), Alaska Airlines ($214), and Southwest ($225) offers the cheapest pricing from Boise to Ontario. Delta is 52% cheaper than the average price of flights available within the next 90 days to this destination.

  • Can I find deals for flights from Boise to Ontario that include hotel bookings?

    Yes. In addition to deals on Boise to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Boise to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boise to Ontario.

  • Can I find deals for business class flights from Boise to Ontario?

    Yes. Cheapflights offers flight deals from Boise to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Boise to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Boise to Ontario (average of $246). Flying from Boise to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Boise to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Boise to Las Vegas flights
Spokane to Los Angeles flights
Boise to Los Angeles flights
Boise to San Diego flights
Spokane to San Diego flights
Spokane to Las Vegas flights
Boise to Santa Ana flights
Boise to Burbank flights
Boise to Sacramento flights
Boise to San Francisco flights
Spokane to San Francisco flights
Spokane to Palm Springs flights
Boise to San Jose flights
Idaho Falls to Los Angeles flights
Spokane to Ontario flights
Spokane to San Jose flights
Idaho Falls to Santa Ana flights
Idaho Falls to Ontario flights
Spokane to Sacramento flights
Spokane to Santa Ana flights
Boise to Palm Springs flights
Boise to Reno flights
Boise to Oakland flights
Lewiston to Yuma flights
Spokane to Long Beach flights
Idaho Falls to Long Beach flights
Jackson to San Diego flights
Idaho Falls to Las Vegas flights
Boise to Fresno flights
Spokane to Fresno flights
Jackson to Los Angeles flights
Boise to Long Beach flights
Idaho Falls to San Francisco flights
Spokane to Oakland flights
Jackson to San Francisco flights
Idaho Falls to San Diego flights
Boise to Santa Barbara flights
Boise to Medford flights
Hailey to San Francisco flights
Spokane to Burbank flights
Jackson to Las Vegas flights
Jackson to Ontario flights
Spokane to Reno flights
Boise to San Luis Obispo flights
Spokane to Monterey flights
Hailey to Los Angeles flights
Idaho Falls to Sacramento flights
Idaho Falls to San Jose flights
Hailey to Las Vegas flights

Top 4 airlines flying from Boise to Ontario

Discover the top 4 airlines that operate flights from Boise to Ontario. 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 2,558,603 searches. Data last updated September 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$156Average$249FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$214Average$316FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$225Average$362FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$232Average$381FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.