United Flight 3643 Deals & Information (2025/2026)

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United Flight 3643 Route Deals From $70

The cheapest prices found with in the last 7 days for return flights were $97 and $70 for one-way flights to Pittsburgh Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Nov 5 - Sat, Nov 8
ORD
O'Hare Intl.
PIT
Pittsburgh Intl.
$97 Roundtrip, found 5 days ago
$97
Roundtrip
found 5 days ago
Select United flight, departing Wed, Nov 5 from O'Hare Intl. to Pittsburgh Intl., returning Sat, Nov 8, priced at $97 found 5 days ago
Thu, Dec 25 - Tue, Dec 30
ORD
O'Hare Intl.
PIT
Pittsburgh Intl.
$114 Roundtrip, found 5 days ago
$114
Roundtrip
found 5 days ago
Select United flight, departing Thu, Dec 25 from O'Hare Intl. to Pittsburgh Intl., returning Tue, Dec 30, priced at $114 found 5 days ago
Tue, Oct 7 - Thu, Oct 9
ORD
O'Hare Intl.
PIT
Pittsburgh Intl.
$120 Roundtrip, found 3 days ago
$120
Roundtrip
found 3 days ago
Select United flight, departing Tue, Oct 7 from O'Hare Intl. to Pittsburgh Intl., returning Thu, Oct 9, priced at $120 found 3 days ago
Thu, Oct 2 - Mon, Oct 6
ORD
O'Hare Intl.
PIT
Pittsburgh Intl.
$126 Roundtrip, found 4 days ago
$126
Roundtrip
found 4 days ago
Select United flight, departing Thu, Oct 2 from O'Hare Intl. to Pittsburgh Intl., returning Mon, Oct 6, priced at $126 found 4 days ago
Thu, Dec 25 - Tue, Dec 30
ORD
O'Hare Intl.
PIT
Pittsburgh Intl.
$127 Roundtrip, found 5 days ago
$127
Roundtrip
found 5 days ago
Select United flight, departing Thu, Dec 25 from O'Hare Intl. to Pittsburgh Intl., returning Tue, Dec 30, priced at $127 found 5 days ago
Thu, Oct 30 - Mon, Nov 3
ORD
O'Hare Intl.
PIT
Pittsburgh Intl.
$154 Roundtrip, found 2 days ago
$154
Roundtrip
found 2 days ago
Select United flight, departing Thu, Oct 30 from O'Hare Intl. to Pittsburgh Intl., returning Mon, Nov 3, priced at $154 found 2 days ago
Thu, Oct 2 - Mon, Oct 6
ORD
O'Hare Intl.
PIT
Pittsburgh Intl.
$157 Roundtrip, found 4 days ago
$157
Roundtrip
found 4 days ago
Select United flight, departing Thu, Oct 2 from O'Hare Intl. to Pittsburgh Intl., returning Mon, Oct 6, priced at $157 found 4 days ago

Frequently asked questions

What route does flight number UA3643 take?
UA3643 takes numerous routes. The most popular is Myrtle Beach Intl. Airport to Dulles Intl. Airport, which is a direct flight. This flight generally takes 1 hour and 25 minutes. That said, you might find other flights with this number that have one or more stops.
What kind of plane is on flight number UA3643?
It's likely you'll be taking off on the Embraer 175 if you're flying from Myrtle Beach Intl. Airport to Washington Dulles Intl. Airport (IAD), one route used for flight UA3643.
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 UA3643 flight with Travelocity, please visit our Customer Service Portal.