$124+ Cheap flights from Boston to Ontario (BOS - ONT)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
BOS — ONT
Jun 1 — Jun 81
Round-trip
1 adult, Economy
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Find cheap flights from Boston to Ontario with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from Boston to OntarioExplore the most affordable flight options available from Boston to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 2, 2026.
Explore the most affordable flight options available from Boston to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 2, 2026.
This United Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/214:15 pm
BOS
- ONT
1 stop9h 43m
United Airlines
Sat 8/227:00 am
ONT
- BOS
1 stop9h 19m
United Airlines
Deal found 4/30![United Airlines logo]()
$292
This Trip.com deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/306:00 am
BOS
- ONT
1 stop11h 55m
Alaska Airlines
Sat 6/65:57 pm
ONT
- BOS
1 stop9h 23m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$296
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/305:45 am
BOS
- ONT
1 stop8h 19m
Delta
Sat 9/127:00 am
ONT
- BOS
1 stop7h 57m
Delta
Deal found 4/28![Delta logo]()
$297
This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/122:22 pm
BOS
- ONT
2 stops11h 13m
United Airlines
Sat 5/161:40 pm
ONT
- BOS
1 stop7h 19m
United Airlines
Deal found 4/27![United Airlines logo]()
$302
This Alaska Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/134:48 pm
BOS
- ONT
1 stop10h 10m
Alaska Airlines
Tue 5/195:57 pm
ONT
- BOS
1 stop9h 24m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$317
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/112:45 pm
BOS
- ONT
1 stop8h 16m
Delta
Mon 9/75:05 pm
ONT
- BOS
1 stop10h 04m
Delta
Deal found 4/30![Delta logo]()
$318
This American Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/297:00 am
BOS
- ONT
1 stop9h 28m
American Airlines
Mon 6/17:12 pm
ONT
- BOS
2 stops10h 29m
American Airlines
Deal found 4/28![American Airlines logo]()
$323
This Trip.com deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/247:20 am
BOS
- ONT
1 stop10h 49m
Alaska Airlines
Tue 6/25:57 pm
ONT
- BOS
1 stop9h 27m
Alaska Airlines
Deal found 5/1![Alaska Airlines logo]()
$325
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/274:46 pm
BOS
- ONT
1 stop8h 50m
American Airlines
Sat 5/3012:41 pm
ONT
- BOS
1 stop8h 23m
American Airlines
Deal found 4/29![American Airlines logo]()
$327
This American Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:20 am
BOS
- ONT
1 stop8h 45m
American Airlines
Sat 6/610:00 pm
ONT
- BOS
1 stop8h 21m
American Airlines
Deal found 4/27![American Airlines logo]()
$328
This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/233:54 pm
BOS
- ONT
1 stop9h 01m
United Airlines
Wed 5/276:30 pm
ONT
- BOS
1 stop8h 28m
United Airlines
Deal found 4/27![United Airlines logo]()
$330
Best flights from Boston to OntarioDiscover carefully curated flight deals from Boston to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 2, 2026.
Discover carefully curated flight deals from Boston to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 2, 2026.
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/245:35 am
BOS
- ONT
1 stop8h 22m
Delta
Tue 6/210:00 pm
ONT
- BOS
1 stop8h 46m
Delta
Deal found 4/30![Delta logo]()
$358
This United Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/296:00 am
BOS
- ONT
1 stop9h 12m
United Airlines
Mon 6/16:30 pm
ONT
- BOS
1 stop8h 28m
United Airlines
Deal found 5/1![United Airlines logo]()
$407
This Alaska Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/247:20 am
BOS
- ONT
1 stop10h 49m
Alaska Airlines
Wed 5/275:57 pm
ONT
- BOS
1 stop9h 23m
Alaska Airlines
Deal found 4/28![Alaska Airlines logo]()
$416
This American Airlines deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:00 am
BOS
- ONT
2 stops10h 18m
American Airlines
Sat 5/166:00 am
ONT
- BOS
1 stop10h 44m
American Airlines
Deal found 5/1![American Airlines logo]()
$440
This Southwest deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/197:20 am
BOS
- ONT
1 stop8h 55m
Southwest
Fri 5/2211:55 pm
ONT
- BOS
1 stop11h 50m
Southwest
Deal found 4/27![Southwest logo]()
$443
This Delta deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/2310:16 am
BOS
- ONT
1 stop11h 20m
Delta
Fri 5/2910:00 pm
ONT
- BOS
1 stop8h 46m
Delta
Deal found 4/30![Delta logo]()
$368
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1110:16 am
BOS
- ONT
1 stop11h 20m
Delta
Tue 5/1912:08 pm
ONT
- BOS
1 stop8h 19m
Delta
Deal found 4/27![Delta logo]()
$379
This Alaska Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/67:00 am
BOS
- ONT
1 stop10h 30m
Alaska Airlines
Sat 5/910:39 am
ONT
- BOS
1 stop10h 20m
Alaska Airlines
Deal found 4/28![Alaska Airlines logo]()
$419
This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/133:08 pm
BOS
- ONT
1 stop10h 38m
United Airlines
Tue 6/166:30 pm
ONT
- BOS
1 stop8h 28m
United Airlines
Deal found 4/27![United Airlines logo]()
$442
This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/116:00 am
BOS
- ONT
1 stop9h 22m
United Airlines
Fri 5/151:40 pm
ONT
- BOS
1 stop7h 19m
United Airlines
Deal found 4/27![United Airlines logo]()
$442
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/2411:20 am
BOS
- ONT
1 stop10h 16m
Delta
Mon 6/110:00 pm
ONT
- BOS
1 stop8h 46m
Delta
Deal found 4/28![Delta logo]()
$409
Last-minute flights from Boston to OntarioDiscover last-minute flight deals from Boston to Ontario. Data last updated May 2, 2026 and is based on user searches.
Discover last-minute flight deals from Boston to Ontario. Data last updated May 2, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/122:22 pm
BOS
- ONT
2 stops11h 13m
United Airlines
Sat 5/161:40 pm
ONT
- BOS
1 stop7h 19m
United Airlines
Deal found 4/27![United Airlines logo]()
$302
This Alaska Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/134:48 pm
BOS
- ONT
1 stop10h 10m
Alaska Airlines
Tue 5/195:57 pm
ONT
- BOS
1 stop9h 24m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$317
This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/233:54 pm
BOS
- ONT
1 stop9h 01m
United Airlines
Wed 5/276:30 pm
ONT
- BOS
1 stop8h 28m
United Airlines
Deal found 4/27![United Airlines logo]()
$330
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/245:35 am
BOS
- ONT
1 stop8h 22m
Delta
Thu 5/284:57 pm
ONT
- BOS
1 stop10h 23m
Delta
Deal found 4/28![Delta logo]()
$318
This Trip.com deal was found by Cheapflights users on 5/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/247:20 am
BOS
- ONT
1 stop10h 49m
Alaska Airlines
Tue 6/25:57 pm
ONT
- BOS
1 stop9h 27m
Alaska Airlines
Deal found 5/1![Alaska Airlines logo]()
$325
This American Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:20 am
BOS
- ONT
1 stop8h 45m
American Airlines
Sat 6/610:00 pm
ONT
- BOS
1 stop8h 21m
American Airlines
Deal found 4/27![American Airlines logo]()
$328
This United Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/275:05 pm
BOS
- ONT
1 stop8h 46m
United Airlines
Thu 5/286:30 pm
ONT
- BOS
1 stop8h 28m
United Airlines
Deal found 4/30![United Airlines logo]()
$297
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/274:46 pm
BOS
- ONT
1 stop8h 50m
American Airlines
Sat 5/3012:41 pm
ONT
- BOS
1 stop8h 23m
American Airlines
Deal found 4/29![American Airlines logo]()
$327
This American Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/297:00 am
BOS
- ONT
1 stop9h 28m
American Airlines
Mon 6/17:12 pm
ONT
- BOS
2 stops10h 29m
American Airlines
Deal found 4/28![American Airlines logo]()
$323
This Trip.com deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/306:00 am
BOS
- ONT
1 stop11h 55m
Alaska Airlines
Sat 6/65:57 pm
ONT
- BOS
1 stop9h 23m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$296
This Alaska Airlines deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/306:00 am
BOS
- ONT
1 stop11h 55m
Alaska Airlines
Tue 6/25:57 pm
ONT
- BOS
1 stop9h 27m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$309
One-way flights from Boston to OntarioSearch for one-way flight options from Boston to Ontario. Find affordable one-way fares based on user searches. Data last updated May 2, 2026.
Search for one-way flight options from Boston to Ontario. Find affordable one-way fares based on user searches. Data last updated May 2, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1910:07 am
BOS
- ONT
2 stops24h 28m
Frontier
Deal found 4/28![Frontier logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:00 am
BOS
- ONT
2 stops20h 49m
Frontier
Deal found 4/30![Frontier logo]()
$128
This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/245:05 pm
BOS
- ONT
1 stop8h 46m
United Airlines
Deal found 4/27![United Airlines logo]()
$149
This American Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1311:15 am
BOS
- ONT
2 stops10h 23m
American Airlines
Deal found 4/27![American Airlines logo]()
$154
This Alaska Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/37:20 am
BOS
- ONT
1 stop10h 49m
Alaska Airlines
Deal found 4/28![Alaska Airlines logo]()
$155
This Alaska Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/127:00 am
BOS
- ONT
1 stop10h 32m
Alaska Airlines
Deal found 4/28![Alaska Airlines logo]()
$159
This CheapOair deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/57:11 pm
BOS
- ONT
1 stop18h 59m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/316:00 am
BOS
- ONT
2 stops52h 35m
Frontier
Deal found 4/28![Frontier logo]()
$166
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1110:16 am
BOS
- ONT
1 stop11h 20m
Delta
Deal found 4/27![Delta logo]()
$170
This Trip.com deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/134:48 pm
BOS
- ONT
1 stop10h 10m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$175
This Trip.com deal was found by Cheapflights users on 5/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/166:00 am
BOS
- ONT
2 stops28h 35m
Frontier
Deal found 5/2![Frontier logo]()
$177
This Jetabroad deal was found by Cheapflights users on 4/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/125:05 pm
BOS
- ONT
1 stop9h 43m
Hawaiian Airlines
Deal found 4/30![Hawaiian Airlines logo]()
$179
Find flight deals from Boston to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Boston (BOS) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 2, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $292 (United Airlines) |
One-way from | $124 (Kiwi.com) |
Popular in | December |
Cheapest in | February |
Average price | $398 |
Cheapflights Fare Finder
Customize your flight search to find flights from Boston to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 2, 2026.
Use the filters below to find and compare flights from Boston to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
BostonOntario
BOS - ONT
BOSONT
Boston Logan Intl
Sun 5/24
5:35 am-10:57 am
1 stop8h 22m
Ontario
Tue 6/2
10:00 pm-9:46 am
1 stop8h 46m
$358
BostonOntario
BOS - ONT
BOSONT
Boston Logan Intl
Sat 5/23
10:16 am-6:36 pm
1 stop11h 20m
Ontario
Fri 5/29
10:00 pm-9:46 am
1 stop8h 46m
$368
BostonOntario
BOS - ONT
BOSONT
Boston Logan Intl
Mon 5/11
10:16 am-6:36 pm
1 stop11h 20m
Ontario
Tue 5/19
12:08 pm-11:27 pm
1 stop8h 19m
$379
BostonOntario
BOS - ONT
BOSONT
Boston Logan Intl
Fri 5/29
6:00 am-12:12 pm
1 stop9h 12m
Ontario
Mon 6/1
6:30 pm-5:58 am
1 stop8h 28m
$407
BostonOntario
BOS - ONT
BOSONT
Boston Logan Intl
Sun 5/24
11:20 am-6:36 pm
1 stop10h 16m
Ontario
Mon 6/1
10:00 pm-9:46 am
1 stop8h 46m
$409
BostonOntario
BOS - ONT
BOSONT
Boston Logan Intl
Sun 5/24
7:20 am-3:09 pm
1 stop10h 49m
Ontario
Wed 5/27
5:57 pm-6:20 am
1 stop9h 23m
$416
BostonOntario
BOS - ONT
BOSONT
Boston Logan Intl
Wed 5/6
7:00 am-2:30 pm
1 stop10h 30m
Ontario
Sat 5/9
10:39 am-11:59 pm
1 stop10h 20m
$419
BostonOntario
BOS - ONT
BOSONT
Boston Logan Intl
Tue 5/12
6:00 am-1:18 pm
2 stops10h 18m
Ontario
Sat 5/16
6:00 am-7:44 pm
1 stop10h 44m
$440
BostonOntario
BOS - ONT
BOSONT
Boston Logan Intl
Sat 6/13
3:08 pm-10:46 pm
1 stop10h 38m
Ontario
Tue 6/16
6:30 pm-5:58 am
1 stop8h 28m
$442
Quickest round-trip
BostonOntario
BOS - ONT
BOSONT
Boston Logan Intl
Mon 5/11
6:00 am-12:22 pm
1 stop9h 22m
Ontario
Fri 5/15
1:40 pm-11:59 pm
1 stop7h 19m
$442
Showing 1-10 of 23 resultsSorted by cheapest first
Compare providers for flights from Boston to Ontario
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boston to Ontario in May.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Boston-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boston-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boston-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Boston-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boston-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Boston to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Boston with our price prediction graph.
BOS-ONT
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Boston to Ontario
How far ahead should I book a flight from Boston to Ontario?
The price you pay for your flight from Boston to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 60 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Boston to Ontario?
Currently, February is the cheapest month in which you can book a flight from Boston to Ontario (average of $317). Flying from Boston to Ontario in December is currently the most expensive (average of $591). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from Boston to Ontario?
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated May 2, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andUnited Airlines from Boston to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Crew
8.6
Comfort
8.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Related info for your journey
Find useful and relevant information for your journey from Boston to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Boston to Ontario
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Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Boston to Ontario by cabin class
Find flights from Boston to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on May 2, 2026.
Boston and Ontario flights
Browse other Boston and Ontario flight options. Last updated on May 2, 2026.
Other flights from Boston
Browse through other flights departing from Boston. Flights are based on user searches made on Cheapflights and were last updated on May 2, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 4 airlines flying from Boston to Ontario
Discover the top 4 airlines that operate flights from Boston to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 2, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$148 | Average$397 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$239 | Average$392 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$258 | Average$358 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$278 | Average$437 | FlexibilityNo cancel fee | On-time63% |