United Flight AC3599 Deals & Information (2025/2026)

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United Flight 3599 Route Deals From $106

The cheapest prices found with in the last 7 days for return flights were $235 and $106 for one-way flights to Pearson Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Nov 8 - Thu, Nov 13
IAD
Washington Dulles Intl.
YYZ
Pearson Intl.
$235 Roundtrip, found 1 day ago
$235
Roundtrip
found 1 day ago
Select United flight, departing Sat, Nov 8 from Washington Dulles Intl. to Pearson Intl., returning Thu, Nov 13, priced at $235 found 1 day ago
Wed, Oct 22 - Sat, Oct 25
IAD
Washington Dulles Intl.
YYZ
Pearson Intl.
$242 Roundtrip, found 1 day ago
$242
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 22 from Washington Dulles Intl. to Pearson Intl., returning Sat, Oct 25, priced at $242 found 1 day ago
Wed, Oct 22 - Sat, Oct 25
IAD
Washington Dulles Intl.
YYZ
Pearson Intl.
$252 Roundtrip, found 1 day ago
$252
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 22 from Washington Dulles Intl. to Pearson Intl., returning Sat, Oct 25, priced at $252 found 1 day ago
Sat, Nov 8 - Thu, Nov 13
IAD
Washington Dulles Intl.
YYZ
Pearson Intl.
$262 Roundtrip, found 1 day ago
$262
Roundtrip
found 1 day ago
Select United flight, departing Sat, Nov 8 from Washington Dulles Intl. to Pearson Intl., returning Thu, Nov 13, priced at $262 found 1 day ago
Wed, Oct 22 - Sat, Oct 25
IAD
Washington Dulles Intl.
YYZ
Pearson Intl.
$270 Roundtrip, found 1 day ago
$270
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 22 from Washington Dulles Intl. to Pearson Intl., returning Sat, Oct 25, priced at $270 found 1 day ago
Wed, Oct 15 - Wed, Oct 22
IAD
Washington Dulles Intl.
YYZ
Pearson Intl.
$273 Roundtrip, found 1 day ago
$273
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 15 from Washington Dulles Intl. to Pearson Intl., returning Wed, Oct 22, priced at $273 found 1 day ago
Wed, Oct 22 - Sat, Oct 25
IAD
Washington Dulles Intl.
YYZ
Pearson Intl.
$275 Roundtrip, found 1 day ago
$275
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 22 from Washington Dulles Intl. to Pearson Intl., returning Sat, Oct 25, priced at $275 found 1 day ago
Sat, Nov 8 - Thu, Nov 13
IAD
Washington Dulles Intl.
YYZ
Pearson Intl.
$277 Roundtrip, found 1 day ago
$277
Roundtrip
found 1 day ago
Select United flight, departing Sat, Nov 8 from Washington Dulles Intl. to Pearson Intl., returning Thu, Nov 13, priced at $277 found 1 day ago
Thu, Oct 30 - Fri, Oct 31
IAD
Washington Dulles Intl.
YYZ
Pearson Intl.
$277 Roundtrip, found 20 hours ago
$277
Roundtrip
found 20 hours ago
Select United flight, departing Thu, Oct 30 from Washington Dulles Intl. to Pearson Intl., returning Fri, Oct 31, priced at $277 found 20 hours ago
Wed, Oct 22 - Sat, Oct 25
IAD
Washington Dulles Intl.
YYZ
Pearson Intl.
$279 Roundtrip, found 1 day ago
$279
Roundtrip
found 1 day ago
Select United flight, departing Wed, Oct 22 from Washington Dulles Intl. to Pearson Intl., returning Sat, Oct 25, priced at $279 found 1 day ago

Frequently asked questions

What route does flight number UA3599 take?
UA3599 is used on multiple routes, but the most common is between Raleigh, NC Airport (RDU-Raleigh - Durham Intl.) and ORD. If you're lucky enough to score a direct flight, you'll disembark the plane in 2 hours and 21 minutes. Multi-stop flights can also travel under the same number, as can flights on other routes.
What terminal does UA3599 fly out of?
You'll likely depart from Terminal 2 if you're setting off from Raleigh–Durham Airport. UA3599 serves multiple routes, but the direct flight between Raleigh, NC Airport (RDU-Raleigh - Durham Intl.) and Chicago, IL Airport (ORD-O'Hare Intl.) is the most popular.
What kind of plane is on flight number UA3599?
There's every chance you'll be taking off on an Embraer 175 if you're jetting from Raleigh, NC Airport (RDU-Raleigh - Durham Intl.) to O'Hare Intl. Airport (ORD), a popular route for flight UA3599.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your UA3599 flight with Travelocity, please visit our Customer Service Portal.