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Cheap Flights from Boise to Ontario International

Compare Boise to Ontario International flight deals

Find the cheapest month or even day of the year to fly to Ontario International

Book the best Ontario International fare with no extra fees

Flight deals from Boise to Ontario International

Looking for a cheap last-minute deal or the best return flight from Boise Airport to Ontario International Airport? If you want to travel next month, return fares start from R 3,730. Find the lowest prices on one-way and return tickets right here.
Ontario.R 1,454 per passenger.Departing Sat, 6 Jun.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Boise on Sat, 6 Jun, arriving in Ontario International.Price includes taxes and charges.From R 1,454, select.
Ontario.R 1,822 per passenger.Departing Tue, 26 May.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Boise on Tue, 26 May, arriving in Ontario International.Price includes taxes and charges.From R 1,822, select.
Ontario.R 2,442 per passenger.Departing Fri, 11 Sep.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Boise on Fri, 11 Sep, arriving in Ontario International.Price includes taxes and charges.From R 2,442, select.
Ontario.R 2,445 per passenger.Departing Mon, 3 Aug.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Boise on Mon, 3 Aug, arriving in Ontario International.Price includes taxes and charges.From R 2,445, select.
Ontario.R 2,457 per passenger.Departing Mon, 20 Jul.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Boise on Mon, 20 Jul, arriving in Ontario International.Price includes taxes and charges.From R 2,457, select.
Ontario.R 2,753 per passenger.Departing Sat, 6 Jun.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Boise on Sat, 6 Jun, arriving in Ontario International.Price includes taxes and charges.From R 2,753, select.
Ontario.R 2,800 per passenger.Departing Sun, 6 Dec.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Boise on Sun, 6 Dec, arriving in Ontario International.Price includes taxes and charges.From R 2,800, select.
Ontario.R 2,942 per passenger.Departing Tue, 10 Nov.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Boise on Tue, 10 Nov, arriving in Ontario International.Price includes taxes and charges.From R 2,942, select.
Ontario.R 2,974 per passenger.Departing Wed, 19 Aug.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Boise on Wed, 19 Aug, arriving in Ontario International.Price includes taxes and charges.From R 2,974, select.
Ontario.R 3,015 per passenger.Departing Fri, 11 Sep.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Boise on Fri, 11 Sep, arriving in Ontario International.Price includes taxes and charges.From R 3,015, select.
Ontario.R 3,988 per passenger.Departing Tue, 26 May.One-way flight with Alaska Airlines.Outbound direct flight with Alaska Airlines departs from Boise on Tue, 26 May, arriving in Ontario International.Price includes taxes and charges.From R 3,988, select.

Find the cheapest month to fly from Boise to Ontario International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Boise to Ontario International flights are currently cheapest in June.
May
from R 1,822
Jun
from R 1,454
Jul
from R 2,457
Aug
from R 2,445
Sep
from R 2,442
Oct
Find prices
Nov
from R 2,942
Dec
from R 2,800
Jan
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Feb
Find prices
Mar
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Apr
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Direct flights from Boise to Ontario International

Boise to Ontario International: Alternative routes

Compare routes from Boise to Ontario below. You may find an airport to fly into that's cheaper, faster, or easier than Ontario International.

Ontario International

4km from central Ontario
Closest
from R 1,454
Search flights

San Bernardino Norton AFB

39km from central Ontario
from R 9,759
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Santa Ana John Wayne

48km from central Ontario
Cheapest
from R 890
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Long Beach Municipal

54km from central Ontario
from R 1,629
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Hawthorne

65km from central Ontario
from R 8,320
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Burbank

67km from central Ontario
from R 1,709
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Los Angeles International

71km from central Ontario
from R 1,619
Search flights

Boise to Ontario: Flight information

The things to know before you go.
Cheapest flight foundR 1,454
Cheapest month to flyJune
Average flight time2 hrs, 7 mins
Most popular airlineAlaska Airlines
Average flights per week18

Finding cheap flights from Boise to Ontario International: Frequently asked questions

The best price we found for a return flight from Boise to Ontario International is R 3,243. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
2 hours and 7 minutes is the average flight time from Boise to Ontario International.
Alaska Airlines, Horizon Air and SkyWest Airlines fly direct from Boise to Ontario International.
As of May 2026, there are 18 flights per week flying from Boise to Ontario International.
The cheapest month to fly from Boise to Ontario International is usually May.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Boise Airport to Ontario International Airport on Friday, 29 May 2026.
Yes – the average flight time is 2 hours and 7 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Ontario International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Ontario is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Southwest Airlines and Alaska Airlines offer the cheapest flight tickets to Ontario International.

Travelling from Boise Air Terminal (Gowen Field) Airport (BOI) to Ontario International Airport (ONT): what you need to know

  • The timezone in Ontario is UTC-7, which is one hour behind Boise.

  • To ensure you get on your BOI to ONT flight, leave enough time to check in and drop off your luggage. Arriving two hours ahead of international departures and one hour before domestic flights is the general rule.

  • During popular months such as July, it's best to get to the airport even earlier. Arrive two hours before domestic departures and four hours ahead for an international flight whenever you're travelling during a high season in general.

  • If you'd like to explore another city along the way, simply deselect 'Direct flights only' when searching for your ticket from Boise Air Terminal (Gowen Field) Airport to Ontario International Airport. These are the top stopovers between BOI and ONT:

    • Harry Reid Airport (formerly McCarran Airport)

    • Salt Lake City International Airport

    • Phoenix Sky Harbour International Airport

How to find the cheapest flights from Boise Air Terminal (Gowen Field) Airport (BOI) to Ontario International Airport (ONT)

  • The cheapest price we've found for a one-way Boise Air Terminal (Gowen Field) Airport to Ontario International Airport flight is R 1,454. A return plane ticket is currently R 3,243. Depending on the availability and when you book, these fares may change.

  • It's often best to book as early as possible if you're looking for cheap tickets from BOI to ONT. That's because airlines change prices based on demand, which tends to rise closer to departure.

  • If you're flexible with your travel plans, use the 'Whole month' tool. It'll show you the cheapest price in every month when searching for your flight from Boise Air Terminal (Gowen Field) Airport to Ontario International Airport.

  • Save time looking for cheap flights from BOI to ONT by setting up a Price Alert. We'll send you an email or notification through the app when fares go down.

  • Tailor your trip with filters. Select your arrival and departure times, airlines and total journey duration. You can also sort the results by 'Fastest,' 'Cheapest' or 'Best' flights from Boise Air Terminal (Gowen Field) Airport to Ontario International Airport.

Handy information about Boise Air Terminal (Gowen Field) Airport (BOI)

  • The address for BOI is 3201 Airport Way.

  • Boise Air Terminal (Gowen Field) Airport has a strong on-time record, reducing your chances of a delayed flight. Departures from BOI arrive at their destination as scheduled 83.53% of the time.

  • Boise Air Terminal (Gowen Field) Airport is about 18 kilometres from central Boise. If you're catching a cab, ride-sharing or driving from the centre, it'll take you 20 minutes or so to arrive, depending on the traffic.

  • Catching public transport? Expect a trip time of around 1 hour 35 minutes.

  • Searching for a handy hotel close to BOI? If you've booked an early flight from Boise Air Terminal (Gowen Field) Airport to Ontario International Airport, these accommodation options will put you moments from your check-in counter:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • ONT is located at 2900 E. Airport Drive.

  • From Ontario International Airport, Ontario is approximately 6 kilometres away. It takes around 10 minutes to get to the centre driving.

  • If you're travelling on public transport, expect a journey of about 1 hour 30 minutes.

When to fly to Ontario International Airport (ONT)

  • The quietest month for a flight from Boise Air Terminal (Gowen Field) Airport to Ontario International Airport is May, while August is the busiest. Choose the best time to go to Ontario based on whether you prefer a faster pace or a more relaxed vibe.

  • Book your flight from Boise Air Terminal (Gowen Field) Airport to Ontario International Airport for August if you'd like to visit Ontario during its warmest month. Expect temperatures of between 15ºC (59ºF) and 35ºC (95ºF).

  • Look for cheap tickets from BOI to ONT in January if you want to travel in cooler conditions. Temperatures are at their lowest around then, ranging between 4ºC (39ºF) and 23ºC (73ºF) on average.

Explore more of United States

  • Ontario has plenty going for it, but there are so many other parts of United States just waiting to be discovered. About 56 kilometres west of Ontario, a trip to Los Angeles will fill your itinerary to the brim. Start with leading attractions like Griffith Observatory, The Broad and La Brea Tar Pits & Museum.

  • San Diego is another standout destination in United States and is around 153 kilometres south of Ontario. No trip is complete without a visit to San Diego Zoo, USS Midway Museum and SeaWorld San Diego.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.