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Cheap Flights from Ontario International to Baltimore Washington International

Compare Ontario International to Baltimore Washington International flight deals

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

Book the best Baltimore Washington International fare with no extra fees

Flight deals from Ontario International to Baltimore Washington International

Looking for a cheap last-minute deal or the best return flight from Ontario International to Baltimore Washington International? Find the lowest prices on one-way and return tickets right here.
Washington D.C..Rs27,067 per passenger.Departing Thu, 15 Jan.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 15 Jan, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs27,067, select.
Washington D.C..Rs33,000 per passenger.Departing Mon, 9 Feb.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 9 Feb, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs33,000, select.
Washington D.C..Rs46,556 per passenger.Departing Tue, 17 Mar.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Tue, 17 Mar, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs46,556, select.
Washington D.C..Rs47,105 per passenger.Departing Sat, 29 Aug.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 29 Aug, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs47,105, select.
Washington D.C..Rs47,105 per passenger.Departing Sat, 26 Sep.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Sat, 26 Sep, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs47,105, select.
Washington D.C..Rs48,278 per passenger.Departing Fri, 29 May.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Fri, 29 May, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs48,278, select.
Washington D.C..Rs48,278 per passenger.Departing Tue, 7 Apr.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 7 Apr, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs48,278, select.
Washington D.C..Rs48,461 per passenger.Departing Wed, 8 Jul.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 8 Jul, arriving in Baltimore Washington International.Price includes taxes and charges.From Rs48,461, select.

Find the cheapest month to fly from Ontario International to Baltimore Washington International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Baltimore Washington International flights are currently cheapest in January.
Jan
from Rs27,067
Feb
from Rs33,000
Mar
from Rs46,556
Apr
from Rs48,278
May
from Rs48,278
Jun
from Rs48,461
Jul
from Rs48,461
Aug
from Rs47,105
Sep
from Rs47,105
Oct
Find prices
Nov
Find prices
Dec
Find prices

Direct flights from Ontario International to Baltimore Washington International

Ontario International to Baltimore Washington International: Alternative routes

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

Ontario to Washington D.C.: Flight information

The things to know before you go.
Cheapest flight foundRs27,067
Cheapest month to flyJanuary
Average flight time4 hrs, 45 mins
Most popular airlineSouthwest Airlines
Average flights per week7

Finding cheap flights from Ontario International to Baltimore Washington International: Frequently asked questions

The best price we found for a return flight from Ontario International to Baltimore Washington International is Rs60,790. 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 45 minutes is the average flight time from Ontario International to Baltimore Washington International.
Southwest Airlines flies direct from Ontario International to Baltimore Washington International.
As of January 2026, there are 7 flights per week flying from Ontario International to Baltimore Washington International.
The cheapest month to fly from Ontario International to Baltimore Washington International is usually January.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Baltimore Washington International Airport on Thursday, 15 January 2026.
Yes – the average flight time is 4 hours and 45 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 Baltimore Washington 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 Washington D.C. is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to Baltimore Washington International.

Flying from Ontario International Airport (ONT) to Baltimore/Wash International Thurgood Marshall Airport (BWI): what you need to know

  • Washington DC is three hours ahead of Ontario and follows the UTC-4 timezone.

  • To ensure you get on your ONT to BWI flight, allow plenty of time for things like baggage drop and finding your gate. Arriving two hours ahead of international departures and an hour before domestic flights is the general travel rule.

  • During popular months like August, it's best to get to the airport earlier than normal. Arrive two hours before a domestic departure and four hours ahead of international flights when you travel during a peak period in general.

  • We make it easy to book a flight with a stopover. To see all your options for tickets from Ontario International Airport to Baltimore/Wash International Thurgood Marshall Airport, deselect 'Direct flights only.' Then, pick a flight that has a stop long enough to explore your chosen city. Popular stopovers between ONT and BWI include:

    • Harry Reid Airport (formerly McCarran Airport)

    • Denver International Airport

    • Hartsfield-Jackson Atlanta International Airport

How to find the cheapest flights from Ontario International Airport (ONT) to Baltimore/Wash International Thurgood Marshall Airport (BWI)

  • Rs27,067 is the best price for a one-way Ontario International Airport to Baltimore/Wash International Thurgood Marshall Airport flight. A return flight starts at Rs60,790. These prices may change depending on demand and availability.

  • Don't leave everything to the last moment. You're more likely to get cheap tickets from ONT to BWI if you book in advance. Airlines often offer some great early bird rates.

  • If you're flexible with your trip dates, try using the 'Whole month' search function. It'll find the lowest price in each month when looking for your flight from Ontario International Airport to Baltimore/Wash International Thurgood Marshall Airport.

  • You won't have to check every day to see if fares have gone down when you create a Price Alert. We'll send you an update the moment there's a better deal on cheap flights from ONT to BWI.

  • Select your ideal arrival and departure times, airlines and number of stops with the filters. Alternatively, sort your results by 'Cheapest' to find the best deals on flights from Ontario International Airport to Baltimore/Wash International Thurgood Marshall Airport.

Handy information about Ontario International Airport (ONT)

  • ONT's address is 2900 E. Airport Drive.

  • Ontario International Airport has a strong on-time performance, so flight disruptions are less likely. Departures from ONT make it to their destination as scheduled 83.6% of the time.

  • Ontario International Airport is about 6 kilometres from central Ontario. If you're catching a cab, ride-sharing or driving from the centre, it'll take 10 minutes or so to get there, depending on the traffic.

  • Catching public transport? Expect a journey time of around 1 hour 30 minutes.

  • Get your holiday off to a stress-free start by staying near ONT. Whether you're boarding an early flight from Ontario International Airport to Baltimore/Wash International Thurgood Marshall Airport or just don't like being rushed, these stays are perfect:

Arriving at Baltimore/Wash International Thurgood Marshall Airport (BWI)

Getting from Baltimore/Wash International Thurgood Marshall Airport (BWI) to central Washington DC

  • Baltimore/Wash International Thurgood Marshall Airport to central Washington DC has a drive time of around 50 minutes. It's approximately 48 kilometres away.

  • It takes roughly 1 hour 30 minutes if you're using public transport.

When to fly to Baltimore/Wash International Thurgood Marshall Airport (BWI)

  • The quietest month for a flight from Ontario International Airport to Baltimore/Wash International Thurgood Marshall Airport is May, while July is the most popular. Pick the best time to visit Washington DC based on whether you prefer a more fast-paced or easygoing experience.

  • The warmest month in Washington DC is July, with the temperature ranging between 19ºC and 33ºC. Book your flights from Ontario International Airport to Baltimore/Wash International Thurgood Marshall Airport in this month if this is the type of weather you like.

  • January sees average temperatures of between -6ºC and 10ºC. Look for cheap tickets from ONT to BWI sometime around then if you like cooler conditions.

Explore more of United States

  • You've seen Washington DC, now it's time to explore other parts of United States. Journey around 322 kilometres north-east to New York to tick off its top attractions. From Statue of Liberty to Central Park and Empire State Building, you'll have a packed itinerary ahead.

  • Around 193 kilometres north-east of Washington DC, Philadelphia is another essential stop in United States. Experience this destination's highlights firsthand at Liberty Bell, Independence Hall and Philadelphia Museum of Art.

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