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$76+ 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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — ONT
Apr 29 — May 61
Wed 4/29
Wed 5/6
1 adult, Economy
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1. Tell us where you want to go

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

Cheap 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 March 30, 2026.

This Expedia deal was found by Cheapflights users on 3/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/71:22 pm
BOI
-
ONT
1 stop11h 27m
Frontier
Tue 5/126:00 am
ONT
-
BOI
1 stop5h 27m
Frontier
Deal found 3/27$140
This CheapOair deal was found by Cheapflights users on 3/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/191:22 pm
BOI
-
ONT
1 stop21h 43m
Frontier
Tue 5/266:00 am
ONT
-
BOI
1 stop5h 30m
Frontier
Deal found 3/29$151
This CheapOair deal was found by Cheapflights users on 3/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1611:53 am
BOI
-
ONT
1 stop20h 38m
Frontier
Sat 4/1812:59 am
ONT
-
BOI
1 stop9h 09m
Frontier
Deal found 3/26$171
This Southwest deal was found by Cheapflights users on 3/30. 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.
Sat 4/256:30 am
BOI
-
ONT
1 stop3h 35m
Southwest
Tue 4/283:45 pm
ONT
-
BOI
1 stop6h 45m
Southwest
Deal found 3/30$177
This Alaska Airlines deal was found by Cheapflights users on 3/30. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/281:15 pm
BOI
-
ONT
Nonstop2h 04m
Alaska Airlines
Wed 4/292:59 pm
ONT
-
BOI
Nonstop2h 00m
Alaska Airlines
Deal found 3/30$197
This Southwest deal was found by Cheapflights users on 3/29. 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 4/307:55 pm
BOI
-
ONT
1 stop4h 10m
Southwest
Sat 5/26:20 pm
ONT
-
BOI
1 stop3h 55m
Southwest
Deal found 3/29$202
This Frontier deal was found by Cheapflights users on 3/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/91:04 pm
BOI
-
ONT
1 stop11h 45m
Frontier
Thu 6/116:00 am
ONT
-
BOI
1 stop5h 09m
Frontier
Deal found 3/29$205
This CheapOair deal was found by Cheapflights users on 3/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/301:15 pm
BOI
-
ONT
Nonstop2h 04m
Alaska Airlines
Sat 5/22:59 pm
ONT
-
BOI
Nonstop2h 00m
Alaska Airlines
Deal found 3/29$207
This Southwest deal was found by Cheapflights users on 3/26. 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 4/166:30 am
BOI
-
ONT
1 stop7h 25m
Southwest
Sat 4/189:30 am
ONT
-
BOI
1 stop5h 45m
Southwest
Deal found 3/26$212
This CheapOair deal was found by Cheapflights users on 3/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/171:22 pm
BOI
-
ONT
1 stop21h 43m
Frontier
Wed 5/2010:50 am
ONT
-
BOI
1 stop24h 40m
Frontier
Deal found 3/29$216

Find 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 March 30, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$140
(Frontier)

One-way from

$76
(Frontier)

Popular in

March

Cheapest in

August

Average price

$488

Good round-trip deal

$197 or less

Good one-way deal

$178 or less
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Ontario flights.
Search Deals
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. 12% potential increase in price ($45 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Boise Air Term. Gowen Fld to Ontario.
Search Deals
Price to beat on a one-way flight from Boise Air Term. Gowen Fld to Ontario.
Search Deals

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 March 30, 2026.
Use the filters below to find and compare flights from Boise to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Wed 5/6

5:00 pm-8:50 pm

1 stop4h 50m

Ontario

Mon 5/11

5:30 pm-10:55 pm

1 stop4h 25m

$207

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Thu 4/23

1:15 pm-2:19 pm

Nonstop2h 04m

Ontario

Sun 5/3

2:59 pm-5:59 pm

Nonstop2h 00m

$217

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 4/28

1:15 pm-2:19 pm

Nonstop2h 04m

Ontario

Wed 4/29

2:59 pm-5:59 pm

Nonstop2h 00m

$217

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 5/5

1:15 pm-2:19 pm

Nonstop2h 04m

Ontario

Wed 5/6

3:24 pm-11:59 pm

1 stop7h 35m

$227
Quickest round-trip

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 5/26

4:14 pm-5:17 pm

Nonstop2h 03m

Ontario

Tue 6/2

7:48 pm-10:47 pm

Nonstop1h 59m

$277

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Sat 5/23

4:14 pm-5:17 pm

Nonstop2h 03m

Ontario

Wed 5/27

7:48 pm-10:47 pm

Nonstop1h 59m

$277

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Tue 5/12

1:15 pm-2:19 pm

Nonstop2h 04m

Ontario

Tue 5/19

11:15 am-5:13 pm

1 stop4h 58m

$280

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Fri 5/15

6:41 pm-11:34 pm

1 stop5h 53m

Ontario

Mon 5/25

6:00 am-11:56 am

1 stop4h 56m

$304
Cheapest one-way

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Fri 4/17

7:55 pm-11:05 pm

1 stop4h 10m

$114

BoiseOntario

BOI - ONT

BOIONT

Boise Air Term. Gowen Fld

Mon 4/20

6:16 pm-11:44 pm

1 stop6h 28m

$118

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/27

Showing 1-10 of 18 resultsSorted by cheapest first
1
2

Compare providers for flights from Boise to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boise to Ontario in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Boise-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boise-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boise-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Boise-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boise-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 March 13, 2026.

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 $77). Flying from Boise to Ontario in December is currently the most expensive (average of $190). 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 March 30, 2026.

When flying from Boise to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from Boise to Ontario?

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 March 30, 2026.
See what other customers who have flown with Southwest,Alaska Airlines, andDelta 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.
Southwest
8.0
Very good
4,329 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,329 reviews
Southwest
8.0
Very good
4,329 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Alaska Airlines
7.9
Good
12,139 reviews
Southwest
8.0
Very good
4,329 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Delta
7.9
Good
8,360 reviews
Southwest
8.0
Very good
4,329 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,520 reviews
Southwest
8.0
Very good
4,329 reviews

Boarding

8.1

Overall

8.0

Comfort

8.0

Food

7.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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.

  • What airports do I use to fly from Boise to Ontario?

    You will need to book a flight from Boise Air Term. Gowen Fld to Ontario if you want to fly from Boise to Ontario. At least 4 different airlines have flights from Air Term. Gowen Fld (BOI) to Ontario (ONT) on a regular basis. There is 1 flight to Ontario from the Boise airport per day. If you manage to book one that is nonstop, then you can expect the flight time from BOI to ONT to be around 2h 03m.

  • How long is the flight from Boise to Ontario?

    A quick flight from Boise to Ontario can take about 2h 04m. Southwest provides one of the quickest options available for as low as $217. 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, Alaska Airlines ($117), Delta ($136), and Southwest ($204) offers the cheapest pricing from Boise to Ontario. Alaska Airlines is 64% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Boise to Ontario one-way?

    The cheapest airlines for a one-way flight from Boise to Ontario are Delta ($78), United Airlines ($98), and Southwest ($108).

  • What are the cheapest flights from Boise to Ontario?

    On average you can expect to pay $290 for a flight from Boise to Ontario. The cheapest flight overall is $117 while the most popular route, (Boise Air Term. Gowen Fld - Ontario) is currently priced at $177.

  • 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 $77). Flying from Boise to Ontario in December is currently the most expensive (average of $190). 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.

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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 March 30, 2026.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$117Average$277FlexibilityNo cancel feeOn-time75%
DeltaCheapest$136Average$320FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$204Average$366FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$211Average$316FlexibilityNo cancel feeOn-time69%

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