Cheap flights from Ontario to Washington, D.C.

Flights overview

Useful information for finding cheap flights from Ontario to Washington, D.C. and booking your next trip
Cheapest round-trip flights $210
Frontier 1 stop 8 hr Sun, May 24 — Tue, Jun 2
The cheapest round-trip flight from Ontario to Washington, D.C. is currently $210
Cheapest one-way flight $111
Frontier 1 stop 22 hr Wed, Jun 3
The cheapest one-way flight from Ontario to Washington, D.C. is currently $111
Cheapest nonstop flights $419
Southwest Nonstop 5 hr Thu, May 28 — Wed, Jun 3
The cheapest nonstop round-trip flight from Ontario to Washington, D.C. is currently $419
Last-minute weekend getaway $371
Frontier 1 stop 28 hr Fri, May 8 — Sun, May 10
The cheapest last-minute weekend getaway from Ontario to Washington, D.C. is currently $371
Cheapest business class flights $496
Frontier 1 stop 24 hr Sat, Aug 1 — Sat, Aug 8
The cheapest business class round-trip flight from Ontario to Washington, D.C. is currently $496
Fastest flight 4 hr 45 min The fastest nonstop flight from Ontario to Washington, D.C. takes 4 hr 45 min
Nonstop flights Every day There are direct flights on this route every day.

When is the cheapest time to fly?

The cheapest month to fly from Ontario to Washington, D.C. is typically September. The most expensive month to fly is typically March.
September
Cheapest
Typical prices: $165–290
March
Most expensive
Typical prices: $265–465

Popular airlines from Ontario to Washington, D.C.

  • Southwest
    Nonstop
    from $356
    Typical price: $335–520
    7 weekly nonstop flights
    ONT - BWI Every day
    2369 weekly connecting flights
    ONT - BWI, DCA, IAD Every day
  • American
    from $341
    Typical price: $325–550
    1185 weekly connecting flights
    ONT - BWI, DCA, IAD Every day
  • United
    from $321
    Typical price: $320–580
    709 weekly connecting flights
    ONT - BWI, DCA, IAD Every day
  • Delta
    from $321
    Typical price: $340–720
    520 weekly connecting flights
    ONT - BWI, DCA, IAD Every day
  • Frontier
    from $210
    Typical price: $200–475
    75 weekly connecting flights
    ONT - BWI, DCA, IAD Every day
  • Alaska
    from $458
    Typical price: $395–830
    73 weekly connecting flights
    ONT - BWI, DCA, IAD Every day

Popular airports near Ontario

  • Ontario International Airport (ONT)
    Ontario United States 11 min 2 mi
  • Los Angeles International Airport (LAX)
    Los Angeles United States 1 hr 7 min 44 mi
  • Tijuana International Airport (TIJ)
    Tijuana Mexico 2 hr 16 min 112 mi
  • San Diego International Airport (SAN)
    San Diego United States 1 hr 50 min 95 mi

Popular airports near Washington, D.C.

  • Ronald Reagan Washington National Airport (DCA)
    Washington United States 19 min 4 mi
  • Dulles International Airport (IAD)
    Washington United States 54 min 22 mi
  • Baltimore/Washington International Thurgood Marshall Airport (BWI) (BWI)
    Baltimore United States 47 min 27 mi
  • Philadelphia International Airport (PHL)
    Philadelphia United States 2 hr 18 min 116 mi

Frequently asked questions about flying from Ontario to Washington, D.C.

The cheapest flights from Ontario to Washington, D.C. are usually in September. Typical ticket prices in September range from $165 to $290.
The cheapest round-trip flight from Ontario to Washington, D.C. recently found on Google Flights was with Frontier from $210. The cheapest one-way flight was with Frontier from $111.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from Ontario to Washington, D.C. is $356, flying from Jul 30 to Aug 5.
  • The cheapest American flight from Ontario to Washington, D.C. is $341, flying from May 29 to Jun 4.
  • The cheapest United flight from Ontario to Washington, D.C. is $321, flying from May 28 to Jun 3.
  • The cheapest Delta flight from Ontario to Washington, D.C. is $321, flying from May 28 to Jun 3.
  • The cheapest Frontier flight from Ontario to Washington, D.C. is $210, flying from May 24 to Jun 2.
  • The cheapest Alaska flight from Ontario to Washington, D.C. is $458, flying from May 24 to May 30.
The cheapest round-trip flight from Ontario to Washington, D.C. starts at $210 from Sun, May 24 to Tue, Jun 2. The cheapest one-way flight starts at $111 and departs on Wed, Jun 3.
4 hr 45 min is the shortest flight time from Ontario to Washington, D.C..
Mid-Mar–Jun is Washington DC's busiest time, with many people timing their visits to coincide with cherry blossom season (late Mar–mid Apr). Washington DC’s conference centers and hotels also bustle while Congress is in session (Sep–Nov and mid-Jan–Jun). Jul–Aug tend to be hot and humid, while snowfall can vary widely in winter. The city’s most popular events are the annual Cherry Blossom Festival in spring, the 4th of July celebration in summer, and the lighting of the National Christmas Tree in winter.
It's easy to use Google Flights to find the cheapest days to fly from Ontario to Washington, D.C..
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.
What counts as the best airline for your flights from Ontario to Washington, D.C. really depends on your individual needs. You may have a favorite carrier or a loyalty program you like, but price, convenience, and airports served also come into play. Flexibility and booking terms – Can you change flights if you want to stay longer or get a refund if you have to postpone your trip? – are also factors that help determine which airline is best to fly from Ontario to Washington, D.C..

In terms of nonstop flights, Southwest is the most popular. Southwest offers 7 nonstop flights and 2,369 connecting flights per week. Southwest flies from Ontario International Airport (ONT) to Baltimore/Washington International Thurgood Marshall Airport (BWI) (BWI) , Ronald Reagan Washington National Airport (DCA) , Dulles International Airport (IAD) .

Other popular airlines flying from Ontario to Washington, D.C. are:
  • American offers 1,185 connecting flights per week. American flies from Ontario International Airport (ONT) to Baltimore/Washington International Thurgood Marshall Airport (BWI) (BWI) , Ronald Reagan Washington National Airport (DCA) , Dulles International Airport (IAD) .
  • United offers 709 connecting flights per week. United flies from Ontario International Airport (ONT) to Baltimore/Washington International Thurgood Marshall Airport (BWI) (BWI) , Ronald Reagan Washington National Airport (DCA) , Dulles International Airport (IAD) .
  • Delta offers 520 connecting flights per week. Delta flies from Ontario International Airport (ONT) to Baltimore/Washington International Thurgood Marshall Airport (BWI) (BWI) , Ronald Reagan Washington National Airport (DCA) , Dulles International Airport (IAD) .
  • Frontier offers 75 connecting flights per week. Frontier flies from Ontario International Airport (ONT) to Baltimore/Washington International Thurgood Marshall Airport (BWI) (BWI) , Ronald Reagan Washington National Airport (DCA) , Dulles International Airport (IAD) .
  • Alaska offers 73 connecting flights per week. Alaska flies from Ontario International Airport (ONT) to Baltimore/Washington International Thurgood Marshall Airport (BWI) (BWI) , Ronald Reagan Washington National Airport (DCA) , Dulles International Airport (IAD) .
The number of connecting flights refers to distinct flights with at least one stop between Ontario and Washington, D.C..
The cheapest round-trip flight from Ontario to Washington, D.C. recently found on Google Flights was with Frontier from $210. The cheapest one-way flight was with Frontier from $111.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from Ontario to Washington, D.C. is $356, flying from Jul 30 to Aug 5.
  • The cheapest American flight from Ontario to Washington, D.C. is $341, flying from May 29 to Jun 4.
  • The cheapest United flight from Ontario to Washington, D.C. is $321, flying from May 28 to Jun 3.
  • The cheapest Delta flight from Ontario to Washington, D.C. is $321, flying from May 28 to Jun 3.
  • The cheapest Frontier flight from Ontario to Washington, D.C. is $210, flying from May 24 to Jun 2.
  • The cheapest Alaska flight from Ontario to Washington, D.C. is $458, flying from May 24 to May 30.
Southwest flies direct from Ontario to Washington, D.C..
  • There are 7 Southwest direct flights from Ontario to Washington, D.C. per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
The cheapest last-minute deal between Ontario and Washington, D.C. at price $371 is offered by Frontier from Fri, May 8 to Sun, May 10.
Southwest flies direct from Ontario to Washington, D.C..
  • There are 7 Southwest direct flights from Ontario to Washington, D.C. per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
There are direct flights from Ontario to Washington, D.C. on a daily basis.
The cheapest direct (nonstop) round-trip flights between Ontario and Washington, D.C. start at $419 from Thu, May 28 to Wed, Jun 3 with Southwest.
It's easy to find nonstop flights with Google Flights! Once you've searched for flights from Ontario to Washington, D.C., just select the nonstop flights only option in the 'Stops’ filter in the search form and view all available direct flights and their prices.
The cheapest business class round-trip flights between Ontario and Washington, D.C. start at $496 from Sat, Aug 1 to Sat, Aug 8 with Frontier.
The cheapest economy class round-trip flights between Ontario and Washington, D.C. start at $210 from Sun, May 24 to Tue, Jun 2.
To book business class trips from Ontario to Washington, D.C., look for the default Economy selection at the top, and change it to your desired cabin class such as Premium Economy, Business Class, or First Class. You can then select your departure and arrival dates, consider available options, and book your business travel.

You can also adjust the trip type to view one-way fares.
The best last-minute getaway deal for the next weekend between Ontario and Washington, D.C. starts at $371 from Fri, May 8 to Sun, May 10 with Frontier.
The cheapest last-minute deal between Ontario and Washington, D.C. at price $371 is offered by Frontier from Fri, May 8 to Sun, May 10.
To find last-minute flight deals from Ontario to Washington, D.C., start by entering the city names, select the desired departure and return dates, and hit the Search button to view flight options.

You can check for last-minute flights for the same day or adjust the trip type to see one-way fares.

Search more flights

Popular trips from Ontario

  1. Boston
    $373
    May 16 — May 24
    1 stop 10 hr 24 min United
  2. Denver
    $56
    Jun 1 — Jun 9
    Nonstop 2 hr 22 min Frontier
  3. Hong Kong
    $1,106
    Oct 30 — Nov 5
    1 stop 20 hr 45 min Cathay Pacific, STARLUX Airlines
  4. Seattle
    $88
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    Nonstop 3 hr 1 min Frontier

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