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336 € Cheap Flights from Milwaukee General Mitchell to Ontario International

Compare Milwaukee General Mitchell to Ontario International flight deals

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

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Flight deals from Milwaukee General Mitchell to Ontario International

Looking for a cheap last-minute deal or the best return flight from Milwaukee General Mitchell Airport to Ontario International Airport? If you want to travel next month, return fares start from 340 €. Find the lowest prices on one-way and return tickets right here.
Ontario.336 € per passenger.Departing Wed, 5 Aug, returning Wed, 12 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Wed, 5 Aug, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 12 Aug, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 336 €, select.
Ontario.338 € per passenger.Departing Thu, 24 Sep, returning Tue, 29 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Thu, 24 Sep, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 29 Sep, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 338 €, select.
Ontario.340 € per passenger.Departing Sat, 6 Jun, returning Tue, 9 Jun.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Sat, 6 Jun, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 9 Jun, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 340 €, select.
Ontario.346 € per passenger.Departing Wed, 29 Jul, returning Thu, 6 Aug.Return flight with Delta.Outbound indirect flight with Delta, departs from Milwaukee General Mitchell on Wed, 29 Jul, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Thu, 6 Aug, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 346 €, select.
Ontario.346 € per passenger.Departing Thu, 16 Jul, returning Tue, 21 Jul.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Thu, 16 Jul, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 21 Jul, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 346 €, select.
Ontario.357 € per passenger.Departing Thu, 12 Nov, returning Mon, 16 Nov.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Thu, 12 Nov, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 16 Nov, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 357 €, select.
Ontario.370 € per passenger.Departing Tue, 20 Oct, returning Tue, 3 Nov.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Tue, 20 Oct, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 3 Nov, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 370 €, select.
Ontario.378 € per passenger.Departing Wed, 24 Jun, returning Wed, 8 Jul.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Wed, 24 Jun, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 8 Jul, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 378 €, select.
Ontario.386 € per passenger.Departing Wed, 30 Sep, returning Sun, 4 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Wed, 30 Sep, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sun, 4 Oct, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 386 €, select.
Ontario.395 € per passenger.Departing Fri, 9 Oct, returning Mon, 12 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Fri, 9 Oct, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 12 Oct, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 395 €, select.
Ontario.404 € per passenger.Departing Tue, 1 Dec, returning Sat, 5 Dec.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Tue, 1 Dec, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 5 Dec, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 404 €, select.
Ontario.443 € per passenger.Departing Sat, 30 May, returning Tue, 2 Jun.Return flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from Milwaukee General Mitchell on Sat, 30 May, arriving in Ontario International.Inbound indirect flight with Alaska Airlines, departs from Ontario International on Tue, 2 Jun, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 443 €, select.
Ontario.455 € per passenger.Departing Mon, 25 May, returning Thu, 28 May.Return flight with Delta.Outbound indirect flight with Delta, departs from Milwaukee General Mitchell on Mon, 25 May, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Thu, 28 May, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 455 €, select.

Find the cheapest month to fly from Milwaukee General Mitchell to Ontario International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Milwaukee General Mitchell to Ontario International flights are currently cheapest in August.
May
from 455 €
Jun
from 340 €
Jul
from 346 €
Aug
from 336 €
Sep
from 338 €
Oct
from 395 €
Nov
from 357 €
Dec
from 404 €
Jan
Find prices
Feb
Find prices
Mar
Find prices
Apr
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Milwaukee General Mitchell to Ontario International: Alternative routes

Compare routes from Milwaukee General Mitchell 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 336 €
Search flights

San Bernardino Norton AFB

39km from central Ontario
Search flights

Santa Ana John Wayne

48km from central Ontario
from 321 €
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Long Beach Municipal

54km from central Ontario
from 331 €
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Hawthorne

65km from central Ontario
Search flights

Burbank

67km from central Ontario
from 299 €
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Los Angeles International

71km from central Ontario
Cheapest
from 229 €
Search flights

Milwaukee to Ontario: Flight information

The things to know before you go.
Cheapest flight found336 €
Cheapest month to flyAugust

Finding cheap flights from Milwaukee General Mitchell to Ontario International: Frequently asked questions

The best price we found for a return flight from Milwaukee General Mitchell to Ontario International is 336 €. 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.
Currently, there are no airlines that fly direct from Milwaukee General Mitchell to Ontario International. But we found flights with one or more stops from 336 €.
As of May 2026, there are no flights flying from Milwaukee General Mitchell to Ontario International.
The cheapest month to fly from Milwaukee General Mitchell to Ontario International is usually August.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Milwaukee General Mitchell Airport to Ontario International Airport on Wednesday, 5 August 2026.
No airlines currently offer direct flights between Milwaukee General Mitchell Airport and Ontario International Airport. Most routes have one or more stops.
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 offers the cheapest flight tickets to Ontario International.

Flying from General Mitchell International Airport (MKE) to Ontario International Airport (ONT): what you need to know

  • Ontario's timezone is UTC-7, which makes Ontario two hours behind Milwaukee.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are tried-and-true travel tips. Get to the airport on time to catch your MKE to ONT flight.

  • Travelling during a peak time like July? School holidays and other high seasons can lead to longer queues and delays at check-in and security. Be extra cautious and get there up to four hours ahead of an international flight and two hours before a domestic departure.

  • We make it a piece of cake to book a flight with a stopover. To see all your options for tickets from General Mitchell International Airport to Ontario International Airport, deselect 'Direct flights only.' Then, pick a flight offering a stop long enough to tour the city of your choice. Stopovers between MKE and ONT include:

    • Denver International Airport

    • Harry Reid Airport (formerly McCarran Airport)

    • Phoenix Sky Harbour International Airport

How to find the cheapest flights from General Mitchell International Airport (MKE) to Ontario International Airport (ONT)

  • Currently, 167 € is the lowest price we've seen for a one-way General Mitchell International Airport to Ontario International Airport flight. The best price for a return plane ticket is 336 €. Bear in mind that fares can change due to demand when booking.

  • To find cheap tickets from MKE to ONT, book in advance. Airlines usually offer the most competitive fares when flights are first released.

  • If you can be flexible with your travel plans, try using the 'Whole month' tool. It'll give you the lowest price across each month when searching for a flight from General Mitchell International Airport to Ontario International Airport.

  • There's no need to check back in every day to see if fares have gone down when you create a Price Alert. We'll update you as soon as there's a better deal on cheap flights from MKE to ONT.

  • Choose your preferred departure and arrival times, airlines and number of stops with the filters. Alternatively, sort your results by 'Cheapest' to get the best deals on flights from General Mitchell International Airport to Ontario International Airport.

Handy information about General Mitchell International Airport (MKE)

  • The address for MKE is 5300 S. Howell Avenue.

  • When it comes to the on-time performance of General Mitchell International Airport, data shows 78.97% of flights complete their journey on time.

  • To reach General Mitchell International Airport from central Milwaukee, it'll take about 15 minutes if you're travelling by car. Of course, this depends on traffic. It's approximately 14 kilometres from the airport to the city centre.

  • You can expect a journey time of about 40 minutes on public transport.

  • Taking an early flight from General Mitchell International Airport to Ontario International Airport? Avoid rushing to the airport (and enjoy a little extra shut-eye) by picking one of these stays near MKE:

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 drive to the centre.

  • It typically takes 1 hour 30 minutes to get there by public transport.

When to fly to Ontario International Airport (ONT)

  • The quietest month for a flight from General Mitchell International Airport to Ontario International Airport is May, while August is the most popular. Choose the best time to visit Ontario based on whether you prefer a faster pace or a more relaxed vibe.

  • Lock in your flight from General Mitchell International Airport to Ontario International Airport for August if you want to go to Ontario during its warmest month. You can expect temperatures of between 15ºC (59ºF) and 35ºC (95ºF).

  • For cooler conditions, search for a cheap ticket from MKE to ONT in January. Average temperatures are between 4ºC (39ºF) and 23ºC (73ºF) then.

Explore more of United States

  • You've done Ontario, now it's time to discover other parts of United States. Journey around 56 kilometres west to Los Angeles to check off its popular sights. From Griffith Observatory to The Broad and La Brea Tar Pits & Museum, you'll have a packed itinerary ahead.

  • If you're eager to discover another major destination in United States, head for San Diego, roughly 153 kilometres south of Ontario. San Diego Zoo, USS Midway Museum and SeaWorld San Diego are key highlights.

Plan the rest of your trip from Milwaukee to Ontario

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