$144+ Cheap flights from Ontario to Boston (ONT - BOS)
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 5/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BOS
May 31 — Jun 71
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Boston 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 Ontario to BostonExplore the most affordable flight options available from Ontario to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2026.
Explore the most affordable flight options available from Ontario to Boston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2026.
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/17:13 pm
ONT
- BOS
1 stop9h 48m
United Airlines
Wed 9/912:30 pm
BOS
- ONT
1 stop8h 49m
United Airlines
Deal found 4/29![United Airlines logo]()
$292
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.
Thu 5/284:57 pm
ONT
- BOS
1 stop10h 23m
Delta
Thu 6/45:35 am
BOS
- ONT
1 stop8h 22m
Delta
Deal found 4/28![Delta logo]()
$297
This Delta deal was found by Cheapflights users on 4/26. 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 8/1010:59 pm
ONT
- BOS
1 stop9h 35m
Delta
Wed 8/191:55 pm
BOS
- ONT
1 stop11h 01m
Delta
Deal found 4/26![Delta logo]()
$298
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.
Tue 5/1211:59 pm
ONT
- BOS
2 stops9h 23m
American Airlines
Wed 5/272:26 pm
BOS
- ONT
1 stop11h 10m
American Airlines
Deal found 4/29![American Airlines logo]()
$302
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3011:15 am
ONT
- BOS
1 stop16h 05m
Alaska Airlines
Wed 6/37:11 pm
BOS
- ONT
1 stop18h 59m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$309
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.
Sat 5/305:55 pm
ONT
- BOS
1 stop9h 25m
Delta
Fri 6/55:35 am
BOS
- ONT
1 stop8h 22m
Delta
Deal found 4/28![Delta logo]()
$318
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.
Fri 5/2912:40 pm
ONT
- BOS
1 stop8h 24m
American Airlines
Sat 6/66:00 am
BOS
- ONT
1 stop8h 51m
American Airlines
Deal found 4/29![American Airlines logo]()
$323
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/221:20 pm
ONT
- BOS
1 stop8h 25m
Southwest
Tue 7/285:25 am
BOS
- ONT
1 stop9h 40m
Southwest
Deal found 4/30![Southwest logo]()
$324
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.
Thu 5/284:57 pm
ONT
- BOS
1 stop10h 23m
Delta
Wed 6/36:10 am
BOS
- ONT
1 stop9h 09m
Delta
Deal found 4/28![Delta 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 5/2910:22 am
ONT
- BOS
1 stop10h 42m
American Airlines
Tue 6/25:57 pm
BOS
- ONT
1 stop9h 02m
American Airlines
Deal found 4/28![American Airlines logo]()
$328
This Southwest deal was found by Cheapflights users on 4/26. 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 9/17:40 am
ONT
- BOS
2 stops10h 45m
Southwest
Wed 9/99:25 am
BOS
- ONT
1 stop8h 00m
Southwest
Deal found 4/26![Southwest logo]()
$329
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.
Tue 8/187:00 am
ONT
- BOS
1 stop7h 36m
United Airlines
Mon 8/243:47 pm
BOS
- ONT
1 stop9h 12m
United Airlines
Deal found 4/30![United Airlines logo]()
$330
Best flights from Ontario to BostonDiscover carefully curated flight deals from Ontario to Boston that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 1, 2026.
Discover carefully curated flight deals from Ontario to Boston that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 1, 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.
Fri 5/295:50 pm
ONT
- BOS
1 stop10h 45m
Delta
Tue 6/26:45 pm
BOS
- ONT
1 stop7h 49m
Delta
Deal found 4/30![Delta logo]()
$318
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 5/610:39 am
ONT
- BOS
1 stop10h 20m
Alaska Airlines
Wed 5/134:48 pm
BOS
- ONT
1 stop10h 10m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$368
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/111:55 pm
ONT
- BOS
2 stops9h 15m
Southwest
Tue 7/75:25 am
BOS
- ONT
1 stop9h 40m
Southwest
Deal found 4/28![Southwest logo]()
$428
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:30 pm
ONT
- BOS
1 stop8h 28m
United Airlines
Wed 5/276:00 am
BOS
- ONT
1 stop9h 12m
United Airlines
Deal found 4/29![United Airlines logo]()
$440
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 5/910:39 am
ONT
- BOS
1 stop10h 20m
Alaska Airlines
Tue 5/125:05 pm
BOS
- ONT
1 stop9h 43m
Alaska Airlines
Deal found 4/30![Alaska Airlines logo]()
$419
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 5/3110:00 pm
ONT
- BOS
1 stop8h 46m
Delta
Tue 6/23:00 pm
BOS
- ONT
1 stop9h 48m
Delta
Deal found 4/30![Delta logo]()
$438
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/69:50 am
ONT
- BOS
2 stops10h 45m
Southwest
Thu 6/114:45 pm
BOS
- ONT
2 stops10h 20m
Southwest
Deal found 4/29![Southwest logo]()
$447
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.
Tue 5/1210:39 am
ONT
- BOS
1 stop10h 20m
Alaska Airlines
Wed 5/134:48 pm
BOS
- ONT
1 stop10h 10m
Alaska Airlines
Deal found 4/30![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.
Mon 6/16:30 pm
ONT
- BOS
1 stop8h 28m
United Airlines
Tue 6/166:00 am
BOS
- ONT
1 stop9h 12m
United Airlines
Deal found 4/27![United Airlines logo]()
$463
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.
Wed 5/66:15 am
ONT
- BOS
2 stops9h 20m
Southwest
Tue 5/126:20 am
BOS
- ONT
2 stops10h 10m
Southwest
Deal found 4/27![Southwest logo]()
$458
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/35:57 pm
ONT
- BOS
1 stop9h 23m
Alaska Airlines
Tue 6/96:00 am
BOS
- ONT
1 stop20h 56m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$436
Last-minute flights from Ontario to BostonDiscover last-minute flight deals from Ontario to Boston. Data last updated May 1, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Boston. Data last updated May 1, 2026 and is based on user searches.
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/117:59 pm
ONT
- BOS
1 stop16h 34m
Alaska Airlines
Wed 5/137:20 am
BOS
- ONT
1 stop10h 49m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$338
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.
Tue 5/1211:59 pm
ONT
- BOS
2 stops9h 23m
American Airlines
Wed 5/272:26 pm
BOS
- ONT
1 stop11h 10m
American Airlines
Deal found 4/29![American Airlines logo]()
$302
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/154:57 pm
ONT
- BOS
1 stop10h 23m
Delta
Sun 5/245:35 am
BOS
- ONT
1 stop8h 22m
Delta
Deal found 4/29![Delta logo]()
$348
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 5/275:57 pm
ONT
- BOS
1 stop9h 23m
Alaska Airlines
Wed 6/37:20 am
BOS
- ONT
1 stop10h 49m
Alaska Airlines
Deal found 4/28![Alaska Airlines logo]()
$334
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.
Thu 5/284:57 pm
ONT
- BOS
1 stop10h 23m
Delta
Thu 6/45:35 am
BOS
- ONT
1 stop8h 22m
Delta
Deal found 4/28![Delta 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.
Fri 5/2912:40 pm
ONT
- BOS
1 stop8h 24m
American Airlines
Sat 6/66:00 am
BOS
- ONT
1 stop8h 51m
American Airlines
Deal found 4/29![American Airlines logo]()
$323
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 5/2910:22 am
ONT
- BOS
1 stop10h 42m
American Airlines
Tue 6/25:57 pm
BOS
- ONT
1 stop9h 02m
American Airlines
Deal found 4/28![American Airlines logo]()
$328
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.
Fri 5/2910:00 pm
ONT
- BOS
2 stops15h 28m
Delta
Wed 6/36:45 pm
BOS
- ONT
1 stop7h 49m
Delta
Deal found 4/30![Delta logo]()
$350
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3011:15 am
ONT
- BOS
1 stop16h 05m
Alaska Airlines
Wed 6/37:11 pm
BOS
- ONT
1 stop18h 59m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$309
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.
Sat 5/305:55 pm
ONT
- BOS
1 stop9h 25m
Delta
Fri 6/55:35 am
BOS
- ONT
1 stop8h 22m
Delta
Deal found 4/28![Delta logo]()
$318
One-way flights from Ontario to BostonSearch for one-way flight options from Ontario to Boston. Find affordable one-way fares based on user searches. Data last updated May 1, 2026.
Search for one-way flight options from Ontario to Boston. Find affordable one-way fares based on user searches. Data last updated May 1, 2026.
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 5/116:59 pm
ONT
- BOS
1 stop10h 24m
United Airlines
Deal found 4/27![United Airlines logo]()
$144
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.
Sat 5/165:55 pm
ONT
- BOS
1 stop9h 25m
Delta
Deal found 4/27![Delta logo]()
$149
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/96:43 pm
ONT
- BOS
2 stops27h 44m
Frontier
Deal found 4/27![Frontier logo]()
$150
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/77:14 pm
ONT
- BOS
2 stops10h 33m
American Airlines
Deal found 4/30![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.
Tue 6/25:57 pm
ONT
- BOS
1 stop9h 27m
Alaska Airlines
Deal found 4/28![Alaska Airlines logo]()
$155
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.
Tue 5/195:57 pm
ONT
- BOS
1 stop9h 24m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$159
This CheapOair deal was found by Cheapflights users on 4/26. 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.
Wed 6/311:15 am
ONT
- BOS
1 stop16h 05m
Alaska Airlines
Deal found 4/26![Alaska Airlines logo]()
$160
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/118:06 pm
ONT
- BOS
2 stops33h 38m
Frontier
Deal found 4/27![Frontier logo]()
$164
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.
Wed 5/279:55 pm
ONT
- BOS
1 stop9h 05m
Southwest
Deal found 4/27![Southwest logo]()
$169
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/155:50 pm
ONT
- BOS
1 stop10h 45m
Delta
Deal found 4/29![Delta logo]()
$170
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/811:55 pm
ONT
- BOS
1 stop9h 20m
Southwest
Deal found 4/29![Southwest logo]()
$175
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.
Sat 5/166:00 am
ONT
- BOS
1 stop9h 11m
Hawaiian Airlines
Deal found 4/30![Hawaiian Airlines logo]()
$177
Find flight deals from Ontario to Boston
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Boston (BOS). 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 1, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $292 (United Airlines) |
One-way from | $144 (United Airlines) |
Popular in | November |
Cheapest in | February |
Average price | $422 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Boston 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 1, 2026.
Use the filters below to find and compare flights from Ontario to Boston that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Fri 5/29
5:50 pm-7:35 am
1 stop10h 45m
Boston Logan Intl
Tue 6/2
6:45 pm-11:34 pm
1 stop7h 49m
$318
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Wed 5/6
10:39 am-11:59 pm
1 stop10h 20m
Boston Logan Intl
Wed 5/13
4:48 pm-11:58 pm
1 stop10h 10m
$368
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Sat 5/9
10:39 am-11:59 pm
1 stop10h 20m
Boston Logan Intl
Tue 5/12
5:05 pm-11:48 pm
1 stop9h 43m
$419
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Tue 5/12
10:39 am-11:59 pm
1 stop10h 20m
Boston Logan Intl
Wed 5/13
4:48 pm-11:58 pm
1 stop10h 10m
$419
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Wed 7/1
11:55 pm-12:10 pm
2 stops9h 15m
Boston Logan Intl
Tue 7/7
5:25 am-12:05 pm
1 stop9h 40m
$428
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Wed 6/3
5:57 pm-6:20 am
1 stop9h 23m
Boston Logan Intl
Tue 6/9
6:00 am-11:56 pm
1 stop20h 56m
$436
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Sun 5/31
10:00 pm-9:46 am
1 stop8h 46m
Boston Logan Intl
Tue 6/2
3:00 pm-9:48 pm
1 stop9h 48m
$438
Quickest round-trip
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Sun 5/24
6:30 pm-5:58 am
1 stop8h 28m
Boston Logan Intl
Wed 5/27
6:00 am-12:12 pm
1 stop9h 12m
$440
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Sat 6/6
9:50 am-11:35 pm
2 stops10h 45m
Boston Logan Intl
Thu 6/11
4:45 pm-12:05 am
2 stops10h 20m
$447
OntarioBoston
ONT - BOS
ONTBOS
Ontario
Wed 5/6
6:15 am-6:35 pm
2 stops9h 20m
Boston Logan Intl
Tue 5/12
6:20 am-1:30 pm
2 stops10h 10m
$458
Showing 1-10 of 22 resultsSorted by cheapest first
Compare providers for flights from Ontario to Boston
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 Ontario to Boston in May.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-Boston flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Boston flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Boston flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Boston 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 Ontario-Boston 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 Ontario to Boston
Have a flexible travel schedule? Discover the best time to fly to Boston from Ontario with our price prediction graph.
ONT-BOS
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 Ontario to Boston
How far ahead should I book a flight from Ontario to Boston?
Booking 62 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to Boston. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest month to book a flight from Ontario to Boston?
Currently, February is the cheapest month in which you can book a flight from Ontario to Boston (average of $331). Flying from Ontario to Boston in November is currently the most expensive (average of $537). 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 Ontario to Boston?
Reviews of airlines servicing Boston
Get insights into the airlines that provide service to Boston. 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 Boston. Reviews last updated May 1, 2026.
Get a feel of what it's like to fly with Southwest,Delta, andUnited Airlines from Ontario to Boston by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Crew
8.6
Overall
8.0
Food
7.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Related info for your journey
Find useful and relevant information for your journey from Ontario to Boston. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Boston?
Book flights to Boston if you plan to visit one of these locationsMedford
Cambridge
Concord
Hampton Beach
Watertown
Brockton
Seekonk
Cranston
Chelsea
Warwick
Peabody
Seabrook
York Beach
Londonderry
Swansea
Old Orchard Beach
Quincy
Waltham
Lowell
Braintree
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes
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Alternative routes for Ontario to Boston
See prices for flight routes from nearby airports that may be better suited for you.
Other flights to Boston
Explore flights to Boston departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on May 1, 2026.
Complete your trip
Complete your trip to Boston by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Boston by cabin class
Find flights from Ontario to Boston, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Boston flights
Browse other Ontario and Boston flight options. Last updated on May 1, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on May 1, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 5 airlines flying from Ontario to Boston
Discover the top 5 airlines that operate flights from Ontario to Boston. 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 1, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$155 | Average$319 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$158 | Average$337 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$242 | Average$413 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$292 | Average$400 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$294 | Average$441 | FlexibilityNo cancel fee | On-time63% |