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118 € Cheap Flights from Ontario International to Washington D.C.

Compare Ontario International to Washington D.C. flight deals

Find the cheapest month or even day of the year to fly to Washington D.C.

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Flight deals from Ontario International to Washington D.C.

Looking for a cheap last-minute deal or the best return flight from Ontario International to Washington D.C.? Find the lowest prices on one-way and return tickets right here.
Washington D.C..118 € per passenger.Departing Thu, 12 Feb, returning Sat, 14 Feb.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 12 Feb, arriving in Washington Ronald Reagan.Inbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Sat, 14 Feb, arriving in Ontario International.Price includes taxes and charges.From 118 €, select.
Washington D.C..128 € per passenger.Departing Sat, 7 Mar, returning Sat, 14 Mar.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Sat, 7 Mar, arriving in Washington Ronald Reagan.Inbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Sat, 14 Mar, arriving in Ontario International.Price includes taxes and charges.From 128 €, select.
Washington D.C..141 € per passenger.Departing Wed, 28 Jan, returning Wed, 4 Feb.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 28 Jan, arriving in Washington Ronald Reagan.Inbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Wed, 4 Feb, arriving in Ontario International.Price includes taxes and charges.From 141 €, select.
Washington D.C..151 € per passenger.Departing Thu, 22 Jan, returning Tue, 27 Jan.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 22 Jan, arriving in Washington Ronald Reagan.Inbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Tue, 27 Jan, arriving in Ontario International.Price includes taxes and charges.From 151 €, select.
Washington D.C..189 € per passenger.Departing Thu, 26 Mar, returning Thu, 2 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 26 Mar, arriving in Washington Ronald Reagan.Inbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Thu, 2 Apr, arriving in Ontario International.Price includes taxes and charges.From 189 €, select.
Washington D.C..210 € per passenger.Departing Wed, 1 Apr, returning Sun, 5 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 1 Apr, arriving in Washington Ronald Reagan.Inbound indirect flight with Frontier Airlines, departs from Washington Ronald Reagan on Sun, 5 Apr, arriving in Ontario International.Price includes taxes and charges.From 210 €, select.
Washington D.C..254 € per passenger.Departing Sat, 2 May, returning Sat, 9 May.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 2 May, arriving in Washington Dulles.Inbound indirect flight with Southwest Airlines, departs from Washington Dulles on Sat, 9 May, arriving in Ontario International.Price includes taxes and charges.From 254 €, select.
Washington D.C..254 € per passenger.Departing Tue, 24 Feb, returning Tue, 3 Mar.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 24 Feb, arriving in Washington Ronald Reagan.Inbound indirect flight with Southwest Airlines, departs from Washington Ronald Reagan on Tue, 3 Mar, arriving in Ontario International.Price includes taxes and charges.From 254 €, select.

Find the cheapest month to fly from Ontario International to Washington D.C.

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Washington D.C. flights are currently cheapest in February.
Jan
from 151 €
Feb
from 118 €
Mar
from 128 €
Apr
from 210 €
May
from 254 €
Jun
from 344 €
Jul
from 357 €
Aug
from 327 €
Sep
from 327 €
Oct
from 373 €
Nov
Find prices
Dec
Find prices

Direct flights from Ontario International to Washington D.C.

Alternative Ontario International to Washington D.C. routes

Looking for the cheapest, fastest or easiest route from Ontario International to Washington D.C.? You could fly into the following airports instead.

Ontario to Washington D.C.: Flight information

The things to know before you go.
Cheapest flight found118 €
Cheapest month to flyFebruary
Average flight time4 hrs, 44 mins
Most popular airlineSouthwest Airlines
Average flights per week8

Finding cheap flights from Ontario International to Washington D.C.: Frequently asked questions

There are 5 airports in Washington D.C.: Washington Ronald Reagan, Camp Springs Andrews AFB, Washington Dulles, Baltimore Washington International, and Manassas.
The best price we found for a return flight from Ontario International to Washington D.C. is 118 €. 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.
4 hours and 44 minutes is the average flight time from Ontario International to Washington D.C..
Southwest Airlines flies direct from Ontario International to Washington D.C..
As of January 2026, there are 16 flights per week flying from Ontario International to Washington D.C..
The cheapest month to fly from Ontario International to Washington D.C. is usually February.
If you're flying from Ontario International Airport, the cheapest airport near Washington D.C. is Washington Ronald Reagan – which is 5.5 km away from the centre of Washington D.C.. We've found flights into this airport from 118 €.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Washington D.C. on Thursday, 12 February 2026.
Yes – the average flight time is 4 hours and 44 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 Washington D.C. 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 Washington D.C. is around 40 days in advance, so don’t leave your flight to the last minute.
In January, the average temperature is usually around 0°C. July is typically the warmest month in Washington D.C., when it usually averages around 31°C. You can expect the least rain in February. The coldest month is January, with temperatures averaging -4°C. The rainiest month is September.
Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to Washington D.C..

Flying from Ontario International Airport (ONT) to Washington DC: what you need to know

  • Ontario International Airport is located in Ontario. Following the UTC-4 timezone, Washington DC is three hours ahead of Ontario.

  • With three weekly flights between the two airports, Ontario International Airport (ONT) to Baltimore/Wash International Thurgood Marshall Airport (BWI) is the most popular route. Southwest Airlines operates the earliest flight at 09:15. If you prefer to get more out of your day before flying, the latest flight from ONT to BWI is with Southwest Airlines at 21:20.

  • For stress-free travel, arrive at the airport two hours ahead of international flights and one hour before domestic departures. That way, you can comfortably catch your ONT to Washington DC flight.

  • Longer lines at security and check-in are likely if you're flying during high season, so give yourself some extra wiggle room. A good rule of thumb for peak times? Get there up to four hours early for international flights and two hours for domestic departures.

  • You can book a direct Ontario International Airport to Washington DC ticket. Begin your trip at ONT and end it at Baltimore/Wash International Thurgood Marshall Airport (BWI).

  • Book your ticket with Southwest Airlines. This airline offers direct flights from Ontario International Airport to Washington DC.

  • The journey from central Ontario to ONT takes around 1 hour 30 minutes on public transport. If you ride-share, drive or grab a cab, you'll cover the 5 kilometres in 10 minutes or so, depending on traffic.

  • Booked an early flight from Ontario International Airport to Washington DC? Avoid the stress of rushing to the airport (and enjoy a little extra shut-eye) by choosing one of these stays near ONT:

  • 83.6% of flights departing from Ontario International Airport arrive at their destination as planned. With its strong on-time stats, you're unlikely to experience delays when taking off from ONT.

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

How to find the cheapest flights from Ontario International Airport (ONT) to Washington DC

  • 64 € is the cheapest price we've found for a one-way Ontario International Airport to Washington DC flight. A round-trip plane ticket right now is 118 €. Depending on the availability and when you book, these fares may change.

  • Lock in cheap flights from ONT to Washington DC by booking one month ahead. Based on our research, that's the best time for finding a bargain.

  • Organise your trip for May. That's the best month for landing the biggest deals on Ontario International Airport to Washington DC tickets. If you have flexibility with your dates, use the 'Whole month' tool to access the cheapest price across each month.

  • Save time looking for cheap flights from ONT to Washington DC by creating a Price Alert. We'll send you an email or push notification on the app when fares go down.

  • Find an affordable flight from Ontario International Airport to Washington DC with the help of our filters. Choose your preferred times, number of stops and airlines, then sort the results by 'Cheapest' to see the best deals.

Airports in Washington DC

Ronald Reagan National Airport (DCA)

  • The distance from Ronald Reagan National Airport (DCA) to central Washington DC is roughly 8 kilometres. It takes around 15 minutes to get to the centre driving.

  • Getting to the centre by public transport will take you around 45 minutes.

  • Think about booking a hotel close to DCA if you have a late flight from Ontario International Airport to Washington DC. Settle into one of these options and make arrival day easier:

  • Go where the road takes you with a Ronald Reagan National Airport rental car. Pick up your wheels from Thrifty, Sixt or Dollar and find adventure across Washington DC and beyond.

  • For the best deal, book your vehicle from Ronald Reagan National Airport about four weeks in advance of your flight from ONT to Washington DC.

  • You'll find DCA at 1 Aviation Circle.

Washington Dulles International Airport (IAD)

  • Once your flight from Ontario International Airport to Washington DC has arrived, you can make your way to the city centre in around 50 minutes by car. Central Washington DC is roughly 56 kilometres from Washington Dulles International Airport (IAD).

  • If you travel by public transport, the ride to the centre will take you 1 hour 10 minutes or so.

  • Place the 'Do not disturb' sign on your door and relax at a hotel close to IAD. Here are a few options where you can kick back after your ONT to Washington DC flight:

  • The fastest way to get to where you're going is with a Washington Dulles International Airport rental car. Collect a set of wheels from Dollar, Thrifty or Sixt and make a speedy getaway.

  • Lock in the best price by reserving your ride from IAD one week ahead of time. You'll also have access to a greater range of vehicles.

  • You can find Washington Dulles International Airport at 1 Saarinen Circle.

Baltimore/Wash International Thurgood Marshall Airport (BWI)

  • Baltimore/Wash International Thurgood Marshall Airport (BWI) is around 48 kilometres from the centre of Washington DC. It takes about 50 minutes to get to the city centre in a ride-share or cab once you've stepped off your flight from Ontario International Airport to Washington DC.

  • If you're using public transport, the journey time is around 1 hour 30 minutes.

  • If you don't want to make the journey into the centre, choose a hotel close to BWI. Settle in at one of these stays after your ONT to Washington DC flight:

  • Stay in control of the next leg of your journey by picking up a Baltimore/Wash International Thurgood Marshall Airport rental car. Dollar, Thrifty and Budget are some companies you can book with.

  • If you're searching for a specific kind of vehicle, book your ride from BWI around two weeks ahead of your flight from Ontario International Airport to Washington DC. This gives you a better shot at getting the car you prefer, along with a better price.

Best time to go to Washington DC

  • Before you book your flights from Ontario International Airport to Washington DC, consider which time of year works best for you. High season in Washington DC offers a bustling atmosphere and plenty of things to do, while the low season brings better deals on hotels and smaller crowds.

  • The warmest month in Washington DC is July, with temperatures ranging between 19ºC (66ºF) and 33ºC (91ºF). Lock in your Ontario International Airport to Washington DC plane ticket then if this is the type of weather you enjoy.

  • January has average temperatures of between -6ºC (21ºF) and 10ºC (50ºF). Search for a cheap ticket from ONT to Washington DC around that time if you like cooler conditions.

More about Washington DC

Explore more of United States

  • Washington DC has loads to offer, but there are so many other corners of United States waiting to be explored. About 322 kilometres north-east of Washington DC, a trip to New York will keep you on the go. Start with leading attractions like Statue of Liberty, Central Park and Empire State Building.

  • Philadelphia is another sought-after destination in United States and is around 193 kilometres north-east of Washington DC. No journey is complete without dropping by Liberty Bell, Independence Hall and Philadelphia Museum of Art.

Plan the rest of your trip from Ontario to Washington D.C.

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