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282 € 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 282 €. Find the lowest prices on one-way and return tickets right here.
Ontario.282 € per passenger.Departing Tue, 18 Aug, returning Tue, 25 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Tue, 18 Aug, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 25 Aug, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 282 €, select.
Ontario.282 € per passenger.Departing Wed, 13 Jan, returning Wed, 20 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Wed, 13 Jan, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 20 Jan, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 282 €, select.
Ontario.282 € per passenger.Departing Wed, 3 Mar, returning Tue, 9 Mar.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Wed, 3 Mar, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 9 Mar, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 282 €, select.
Ontario.282 € per passenger.Departing Mon, 9 Nov, returning Mon, 16 Nov.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Mon, 9 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 282 €, select.
Ontario.282 € per passenger.Departing Tue, 8 Sep, returning Tue, 8 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Tue, 8 Sep, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 8 Sep, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 282 €, select.
Ontario.287 € per passenger.Departing Sat, 12 Dec, returning Sat, 23 Jan.Return flight with United.Outbound indirect flight with United, departs from Milwaukee General Mitchell on Sat, 12 Dec, arriving in Ontario International.Inbound indirect flight with United, departs from Ontario International on Sat, 23 Jan, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 287 €, select.
Ontario.298 € per passenger.Departing Mon, 19 Oct, returning Tue, 20 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Mon, 19 Oct, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 20 Oct, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 298 €, select.
Ontario.298 € per passenger.Departing Thu, 27 Aug, returning Sat, 5 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Thu, 27 Aug, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 5 Sep, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 298 €, select.
Ontario.314 € per passenger.Departing Sat, 12 Dec, returning Thu, 17 Dec.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Sat, 12 Dec, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 17 Dec, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 314 €, select.
Ontario.325 € per passenger.Departing Fri, 4 Sep, returning Mon, 9 Nov.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Fri, 4 Sep, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 9 Nov, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 325 €, select.
Ontario.350 € per passenger.Departing Tue, 29 Sep, returning Fri, 2 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Tue, 29 Sep, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Fri, 2 Oct, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 350 €, select.
Ontario.353 € per passenger.Departing Tue, 19 Jan, returning Tue, 9 Feb.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Tue, 19 Jan, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 9 Feb, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 353 €, select.
Ontario.354 € per passenger.Departing Tue, 27 Oct, returning Sun, 1 Nov.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Tue, 27 Oct, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sun, 1 Nov, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 354 €, select.
Ontario.362 € per passenger.Departing Tue, 27 Apr, returning Wed, 5 May.Return flight with Delta.Outbound indirect flight with Delta, departs from Milwaukee General Mitchell on Tue, 27 Apr, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Wed, 5 May, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 362 €, select.
Ontario.414 € per passenger.Departing Mon, 15 Feb, returning Fri, 19 Feb.Return flight with United.Outbound indirect flight with United, departs from Milwaukee General Mitchell on Mon, 15 Feb, arriving in Ontario International.Inbound indirect flight with United, departs from Ontario International on Fri, 19 Feb, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 414 €, select.
Ontario.557 € per passenger.Departing Sat, 25 Jul, returning Sat, 1 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Milwaukee General Mitchell on Sat, 25 Jul, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 1 Aug, arriving in Milwaukee General Mitchell.Price includes taxes and charges.From 557 €, 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.
Jul
from 562 €
Aug
from 282 €
Sep
from 282 €
Oct
from 298 €
Nov
from 282 €
Dec
from 314 €
Jan
from 282 €
Feb
from 414 €
Mar
from 282 €
Apr
Find prices
May
Find prices
Jun
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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 282 €
Search flights

San Bernardino Norton AFB

39km from central Ontario
from 575 €
Search flights

Santa Ana John Wayne

48km from central Ontario
from 282 €
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Long Beach Municipal

54km from central Ontario
from 287 €
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Hawthorne

65km from central Ontario
Search flights

Burbank

67km from central Ontario
from 322 €
Search flights

Los Angeles International

71km from central Ontario
Cheapest
from 213 €
Search flights

Milwaukee to Ontario: Flight information

The things to know before you go.
Cheapest flight found282 €
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 282 €. 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 282 €.
As of July 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 Tuesday, 18 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.

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

  • Ontario's timezone is UTC-8, making Ontario two hours behind Milwaukee.

  • Leave enough time to catch your MKE to ONT flight. As a general rule, turn up two hours before international departures and an hour ahead for domestic flights.

  • Travelling during a peak time such as June? School holidays and other popular periods can lead to longer lines at security. Be extra cautious and arrive up to four hours before an international flight and two hours before domestic departures.

  • If you'd like to explore another city along the way, simply deselect 'Direct flights only' when searching for your ticket from Milwaukee General Mitchell Airport to Ontario International Airport. Here are the top stopovers between MKE and ONT:

    • Denver International Airport

    • Phoenix Sky Harbour Airport

    • Harry Reid International Airport

Handy information about Milwaukee General Mitchell Airport (MKE)

  • You'll find MKE at 5300 S. Howell Avenue.

  • 76% of flights that depart Milwaukee General Mitchell Airport make it to their destination on schedule.

  • Central Milwaukee to Milwaukee General Mitchell Airport is approximately 16 kilometres. Depending on traffic, it'll take you about 20 minutes to get there if you're driving, ride-sharing or catching a taxi.

  • The trip when using public transport typically takes 40 minutes.

  • Get your break off to a stress-free start by staying near MKE. Whether you have an early flight from Milwaukee General Mitchell Airport to Ontario International Airport or just don't want to be rushed, these stays are ideal:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • You'll find ONT at 2900 E. Airport Drive.

  • From Ontario International Airport, Ontario is approximately 10 kilometres away. It takes around 15 minutes to reach the centre by car.

  • If you're travelling on public transport, expect a journey time of roughly 45 minutes.

When to fly to Ontario International Airport (ONT)

  • The quietest month for a flight from Milwaukee General Mitchell Airport to Ontario International Airport is March, while July is the most popular. Choose the ideal time to go to Ontario based on whether you prefer a more fast-paced or easygoing experience.

  • Lock in your flight from Milwaukee General Mitchell Airport to Ontario International Airport for August if you'd like to go to Ontario during its warmest month. Expect temperatures of between 16ºC (61ºF) and 36ºC (97ºF).

  • February has average temperatures of between 4ºC (39ºF) and 24ºC (75ºF). Look for cheap tickets from MKE to ONT sometime then if you like travelling in cooler conditions.

Explore more of the United States

  • Los Angeles is just one of the many places in the United States waiting to be discovered once you've taken in the sights of Ontario. Around 56 kilometres away to the west, well-known attractions include Hollywood Sign, Universal Studios Hollywood and Hollywood Bowl.

  • Around 153 kilometres south of Ontario, San Diego is another favourite stop in the United States. Start your sightseeing at San Diego Zoo, San Diego Balboa Park and USS Midway Museum.

Plan the rest of your trip from Milwaukee to Ontario

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.