$59 Find Cheap Flights from Ontario to Maryland

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Maryland departing on 5/6. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Maryland

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Maryland.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Maryland.
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Flight Deals

Book Cheap Ontario to Maryland Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Maryland that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Maryland

Wed, May 6 - Tue, May 12
Frontier Logo
10:50 am - 5:37 am
ONT
-
PHL
15h 47m
1 stop
Frontier Logo
8:35 pm - 10:05 am
PHL
-
ONT
16h 30m
1 stop
$124Frontier
Tue, May 5 - Tue, May 12
Frontier Logo
6:00 am - 5:37 am
ONT
-
PHL
20h 37m
1 stop
Frontier Logo
8:35 pm - 10:05 am
PHL
-
ONT
16h 30m
1 stop
$126Frontier
Wed, May 6 - Mon, May 11
Frontier Logo
10:50 am - 5:37 am
ONT
-
PHL
15h 47m
1 stop
Frontier Logo
8:35 pm - 10:05 am
PHL
-
ONT
16h 30m
1 stop
$128Frontier
Wed, May 6 - Thu, May 7
Frontier Logo
10:50 am - 5:37 am
ONT
-
PHL
15h 47m
1 stop
Frontier Logo
8:35 pm - 10:05 am
PHL
-
ONT
16h 30m
1 stop
$129Frontier
Tue, May 5 - Mon, May 11
Frontier Logo
10:50 am - 5:37 am
ONT
-
PHL
15h 47m
1 stop
Frontier Logo
8:35 pm - 10:05 am
PHL
-
ONT
16h 30m
1 stop
$130Frontier
Sun, May 3 - Thu, May 7
Frontier Logo
12:59 am - 5:34 am
ONT
-
PHL
25h 35m
1 stop
Frontier Logo
8:35 pm - 10:05 am
PHL
-
ONT
16h 30m
1 stop
$138Frontier
Mon, Apr 27 - Tue, May 5
Frontier Logo
12:59 am - 5:34 am
ONT
-
PHL
25h 35m
1 stop
Frontier Logo
8:35 pm - 10:05 am
PHL
-
ONT
16h 30m
1 stop
$149Frontier
Tue, May 5 - Tue, May 19
Frontier Logo
10:50 am - 5:37 am
ONT
-
PHL
15h 47m
1 stop
Frontier Logo
8:35 pm - 10:05 am
PHL
-
ONT
16h 30m
1 stop
$151Frontier
Tue, May 5 - Tue, May 12
Multiple Airlines Logo
8:06 pm - 8:08 pm
ONT
-
BWI
21h 02m
1 stop
Multiple Airlines Logo
9:13 pm - 7:35 am
BWI
-
ONT
13h 22m
1 stop
$166Multiple Airlines
Tue, May 5 - Tue, May 12
Multiple Airlines Logo
8:06 pm - 4:22 pm
ONT
-
BWI
17h 16m
2 stops
Multiple Airlines Logo
9:13 pm - 7:35 am
BWI
-
ONT
13h 22m
1 stop
$181Multiple Airlines
Booking Insights

KAYAK's insights & trends for Ontario to Maryland flights

Get data-powered insights and trends into flights from Ontario to Maryland to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Ontario to Maryland?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Maryland departing in May.

What is the cheapest Ontario to Maryland flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Maryland from Ontario found in the last 72 hours was to Baltimore, at $302 round-trip. The most popular route is from Ontario (ONT) to Baltimore (BWI), and the cheapest round-trip airline ticket found on this route in the last 72 hours was $302.

Can I save money by flying with a layover from Ontario to Maryland?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $512, prices are generally cheapest when you fly direct.

What is the cheapest month to fly from Ontario to Maryland?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Maryland, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Maryland is January, when tickets cost $223 (return) on average. On the other hand, the most expensive months are December and November, when the average cost of round-trip tickets is $611 and $478 respectively.

Good to know

Low seasonJanuary
Cheapest flight$59
Best time to beat the crowds with an average 38% drop in price.
Most popular time to fly and prices are also 9% lower on average.
Flight from Ontario to Philadelphia

FAQs - booking Maryland flights

  • How does KAYAK find such low prices on flights from Ontario to Maryland?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Maryland.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Maryland?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario to Maryland is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Maryland?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Ontario to Maryland with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Maryland?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Ontario to Maryland up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines serving from Ontario to Maryland

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Maryland. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Maryland? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4338 reviews
8.1Boarding
8.0Comfort
8.6Crew
7.0Food
7.5Entertainment
Airline reviews

Terrible. Even though there’s assigned seating now, they are still the slowest boarding airline of anyone.

2.0 MediocreJames, Apr 2026
LAX - MCO
Read more Southwest reviews

Terrible. Even though there’s assigned seating now, they are still the slowest boarding airline of anyone.

It was good from LAX to Phoenix, But the connection in Phoenix to Tulsa was not that great. The staff on both flights were great. The choice of free entertainment was ok nothing to brag about. The 45 min delay because of some electrical issue wasn't great from Phoenix to Tulsa. We sat there with hardly any air, The seat I had was between windows so the side of the plane pushed in on you. My being a bigger man it then made the seating area uncomfortable. The seats on the plane had no power to connect to recharge your phone or anything. I would recommend that they should look into a slot or clamp to hold your phone to enjoy while watching the entertainment choices hands-free. Also make it possible to raise the inner seat by the window be able to raise the arm rest up to make more room for larger people to set more comfortably. I would also say other then that stop price gouging the airfare or nickel and diming everything. Not fair for people having to fly for emergencies and be paying for higher prices due to the season or holidays. Your making your money either way and the cost of flying is still going to be the same regardless if there's 100 people or 200 people.

Southwest continues to do less for more money. Flight attendants used to be fun and friendly. But now it’s like they don’t even see you. Such a shame.

I liked it better when you were truer to your roots Am paying more for less fun

Southwest was greaat! The most expensive but the least upsetting for those we were flying to see.

Boarding was easy. The seats are small and fairly uncomfortable

We had a 5 hour delay on the tarmac in Baltimore

Long layover between flights to Long Island from BWI - need better coordination between flights

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

Generally on time departures and arrivals, clean planes, sky miles membership provides great benefits (complimentary upgrades, etc).

N Everything was perfect from boarding to assistance to baggage in Tampa

Loved the crew! Sucks that we went from 1 hour and 8 minute layover to a 3 hour layover. But weather sucks like that.

Fast, lovely scenery, great info on the Delta flight screen about landmarks we were flying over. Great landing!

Long flight but comfortable and not freezing as I have experienced on Hawaiian flights to the islands. They gave us blankets just in case. Nice touch.

I took seat 15A in anticipation of window seat, there is no window.

Flight late, the waited for a long time for “personal” to arrive at gate to dock the plane in Rochester. So annoying. This flight was expected, why aren’t personel available for the jet bridge?

My recent experience was excellent on Delta! I flew with Delta Comfort and I was really comfortable in my seat. I enjoyed the in-flight service. The flight attendants were so friendly and hospitable. I love the snack on the flight as well. This was my first time flying on Delta and I will definitely consider flying with them again.

My flight was canceled on Sunday. Rebooking took three hours. Had to pay for accommodations another night. New flight was delayed for 5 hours, all that was sent was a 12 dollar food voucher, which doesn’t tell you how to use it. Then when we landed we had to sit on the plane for an hour before we could get off.

I was in first class and literally the men behind me were so aggressively loud I moved myself to economy. This has become so common on Delta - people using audio without headphones, and men on 12am / late night flights drinking and yelling to talk to each other which prevents anyone around them from resting. Pretty crazy to have to move from first to economy (poorer service, less comfort...). Wild wild. Looking into other airlines.

Boarding was again a "free for all". We were boarding group 4, and almost the entire plane was able to board before us. It's a shame that someone who follows the rules, gets the short end of the stick. Not fair.

It was perfect! I've never flown with United before, but I definitely will in the future

I had a cancelled flight because of technical issues going to my destination, and a delayed flight coming home. All told it wasn’t a total bust.

They delayed the flight from 9:00 to 11:55 At 11:45 they canceled the flight. I paid a premium price for the tickets with poor service

My flight was canceled a few hours before boarding. I was rebooked on Copa airlines and missed an important meeting .

OK, we were delayed and had to de plane and reboard.

Seats are uncomfortable. This has been a trend in the industry for decades. Trying to fit more seats on each plane to increase profits at the expense of the passenger.

Staff were good. My seat was in need of repair, but for a short flight was not problematic. Usual basic snack and drink setup that you'll find on any US carrier. Over, a decent, basic flight.

Complimentary light meal would be appreciated. But great flight crew service on all legs

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

We left at 1030 am pacific from LA and supposed to land at 7 pm Eastern in NY. They made a detour, stopped in Philadelphia and didn’t land till 1130 PM Eastern!!! Worst flight experience with no pilot communication with no explanation as to what was going on. Everyone was very frustrated to say the least.

Flight boarded from Gate 159B, the farthest gate in the LAX Bradley Terminal. While the flight operated on time, the first class cabin attendant made no recognition of my being an Advantage Executive Platinum member.

The flight itself was excellent but the gate attendant made me check my carryon since she said it was an inch too big. I’ve had no problems with this carryon on recent flights on Qantas, Delta, Austrian, Southwest Airlines even though the overhead bins are the same size. there were other carryons in the bins that also looked larger than mine and there was room left in the bins for more. When I picked up my carryon from baggage claim one of the wheels had broken off.

The flight changed gates multiple times and flight had to be delayed multiple times

I was in last row so that is never great bc the person in front of me leaned his seat all the way back into me.

The experience at checkin for my American Airlines flight from Sacramento to LAX was very good including the assistance I received in getting my bags checked in and boarding passes printed. Was pleasantly surprised the my bags were checked through all the way to my destination at Clark International Airport in Angeles, Philippines.

Terrible planning. And even worse gate agents. Absolutely rude behavior.

Flight was scheduled at 11:26am but they keep Delaying until midnight. They waited at airport restless.

Rough flight No beverage service due to turbulence Bottom Seat cushion was non existent

Remind customers of the need to have passport or new ID for boarding.

The flight never took off and we spent 7 hours at the airport

It was ok. It was expensive to check 2 bags ($75.00 per bag), and then it took a long time to wait for shuttle to take us from one terminal to the terminal where the plane was taking off at LAX. And all of this for a flight where we had to pay for any food or drink that was not water.

When I wanted to check in 3 hours prior to boarding time, the employees mentioned “a little over an hour delay” so I waited for an hour then I went to go look for food in the terminal and most people from that flight were in the same area looking for food. Finally I decided after food to check to see if it’s anytime closer and now it’s 2 mins until boarding closes?! What are you kidding me? I didn’t receive anything via sms about boarding now nor via email or on the intercom. I luckily made it through, barely, and then there’s no room for my carry on mind you I’m in the very first row so I had to place my purse in one further row back and my carry on sections down. Not sure who pays for better seats to get your stuff placed all over the plane but that was the worst experience I’ve ever had flying with anyone.

Inbound plane was on time and flight departed on time with no issues while boarding.

This airline sucks. They offer low rates then charge you for everything, the app does not work well, the seats are the most uncomfortable. Maintenance issues on the flight, and you still have to sit through their credit card commercials. People are nice enough but does not make up for overall poor experience.

After boarding and un-boarding twice over 6+hours, the flight was canceled.

Cancelled flight after I arrived at airport after 75 min drive and parking. Next flight was 4 days in the future. Had to scramble and buy a much more expensive flight on another carrier.

The Boarding process in Denver was chaotic, and since the line was so long, we were lined up very far from the gate. If there were any announcements from the gate staff, we didn't hear them. The flight attendants were spectacular. The only negative part of the flight was sitting by a 2 1/2 year old who was unruly and unfortunately had parents that matched his behaviors. Also, the restaurants in Denver on the E concourse, they didn't have food (passengers could only order 1 item on the entire menu) or the restaurants had 12-14 people waiting for orders to be prepared and another 6 people waiting to order. If you have a layover in Denver and need to grab food, be prepared to visit the shops with pre-packaged sandwiches, or you can visit another concourse but it may take a while to transit throughout the airport.

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

Everything you need to know for your flight from Ontario to Maryland

Information on your arrival and departure airports